diff --git a/src/audio_controller.cpp b/src/audio_controller.cpp
index 011a06232..27ec41b7c 100644
--- a/src/audio_controller.cpp
+++ b/src/audio_controller.cpp
@@ -39,6 +39,7 @@
 #include "ass_file.h"
 #include "audio_timing.h"
 #include "compat.h"
+#include "dialog_progress.h"
 #include "include/aegisub/audio_player.h"
 #include "include/aegisub/audio_provider.h"
 #include "include/aegisub/context.h"
@@ -113,7 +114,7 @@ void AudioController::OnComputerResuming(wxPowerEvent &)
 	{
 		try
 		{
-			player = AudioPlayerFactory::GetAudioPlayer(provider.get());
+			player = AudioPlayerFactory::GetAudioPlayer(provider.get(), context->parent);
 		}
 		catch (...)
 		{
@@ -133,7 +134,7 @@ void AudioController::OnAudioPlayerChanged()
 
 	try
 	{
-		player = AudioPlayerFactory::GetAudioPlayer(provider.get());
+		player = AudioPlayerFactory::GetAudioPlayer(provider.get(), context->parent);
 	}
 	catch (...)
 	{
@@ -157,7 +158,8 @@ void AudioController::OpenAudio(agi::fs::path const& url)
 
 	std::unique_ptr<AudioProvider> new_provider;
 	try {
-		new_provider = AudioProviderFactory::GetProvider(url);
+		DialogProgress progress(context->parent);
+		new_provider = AudioProviderFactory::GetProvider(url, &progress);
 		config::path->SetToken("?audio", url);
 	}
 	catch (agi::UserCancelException const&) {
@@ -173,7 +175,7 @@ void AudioController::OpenAudio(agi::fs::path const& url)
 
 	try
 	{
-		player = AudioPlayerFactory::GetAudioPlayer(provider.get());
+		player = AudioPlayerFactory::GetAudioPlayer(provider.get(), context->parent);
 	}
 	catch (...)
 	{
diff --git a/src/audio_player.cpp b/src/audio_player.cpp
index 9c1b6aaa0..47d55bfab 100644
--- a/src/audio_player.cpp
+++ b/src/audio_player.cpp
@@ -47,18 +47,18 @@ AudioPlayer::AudioPlayer(AudioProvider *provider)
 {
 }
 
-std::unique_ptr<AudioPlayer> CreateAlsaPlayer(AudioProvider *providers);
-std::unique_ptr<AudioPlayer> CreateDirectSoundPlayer(AudioProvider *providers);
-std::unique_ptr<AudioPlayer> CreateDirectSound2Player(AudioProvider *providers);
-std::unique_ptr<AudioPlayer> CreateOpenALPlayer(AudioProvider *providers);
-std::unique_ptr<AudioPlayer> CreatePortAudioPlayer(AudioProvider *providers);
-std::unique_ptr<AudioPlayer> CreatePulseAudioPlayer(AudioProvider *providers);
-std::unique_ptr<AudioPlayer> CreateOSSPlayer(AudioProvider *providers);
+std::unique_ptr<AudioPlayer> CreateAlsaPlayer(AudioProvider *providers, wxWindow *window);
+std::unique_ptr<AudioPlayer> CreateDirectSoundPlayer(AudioProvider *providers, wxWindow *window);
+std::unique_ptr<AudioPlayer> CreateDirectSound2Player(AudioProvider *providers, wxWindow *window);
+std::unique_ptr<AudioPlayer> CreateOpenALPlayer(AudioProvider *providers, wxWindow *window);
+std::unique_ptr<AudioPlayer> CreatePortAudioPlayer(AudioProvider *providers, wxWindow *window);
+std::unique_ptr<AudioPlayer> CreatePulseAudioPlayer(AudioProvider *providers, wxWindow *window);
+std::unique_ptr<AudioPlayer> CreateOSSPlayer(AudioProvider *providers, wxWindow *window);
 
 namespace {
 	struct factory {
 		const char *name;
-		std::unique_ptr<AudioPlayer> (*create)(AudioProvider *);
+		std::unique_ptr<AudioPlayer> (*create)(AudioProvider *, wxWindow *window);
 		bool hidden;
 	};
 
@@ -89,7 +89,7 @@ std::vector<std::string> AudioPlayerFactory::GetClasses() {
 	return ::GetClasses(boost::make_iterator_range(std::begin(factories), std::end(factories)));
 }
 
-std::unique_ptr<AudioPlayer> AudioPlayerFactory::GetAudioPlayer(AudioProvider *provider) {
+std::unique_ptr<AudioPlayer> AudioPlayerFactory::GetAudioPlayer(AudioProvider *provider, wxWindow *window) {
 	if (std::distance(std::begin(factories), std::end(factories)) == 0)
 		throw agi::NoAudioPlayersError("No audio players are available.", nullptr);
 
@@ -99,7 +99,7 @@ std::unique_ptr<AudioPlayer> AudioPlayerFactory::GetAudioPlayer(AudioProvider *p
 	std::string error;
 	for (auto factory : sorted) {
 		try {
-			return factory->create(provider);
+			return factory->create(provider, window);
 		}
 		catch (agi::AudioPlayerOpenError const& err) {
 			error += std::string(factory->name) + " factory: " + err.GetChainedMessage() + "\n";
diff --git a/src/audio_player_alsa.cpp b/src/audio_player_alsa.cpp
index 61f009f07..338fecfe6 100644
--- a/src/audio_player_alsa.cpp
+++ b/src/audio_player_alsa.cpp
@@ -461,7 +461,7 @@ void AlsaPlayer::SetVolume(double vol)
 }
 }
 
-std::unique_ptr<AudioPlayer> CreateAlsaPlayer(AudioProvider *provider)
+std::unique_ptr<AudioPlayer> CreateAlsaPlayer(AudioProvider *provider, wxWindow *)
 {
 	return agi::util::make_unique<AlsaPlayer>(provider);
 }
diff --git a/src/audio_player_dsound.cpp b/src/audio_player_dsound.cpp
index f5844f294..77334ba93 100644
--- a/src/audio_player_dsound.cpp
+++ b/src/audio_player_dsound.cpp
@@ -84,7 +84,7 @@ class DirectSoundPlayer final : public AudioPlayer {
 	DirectSoundPlayerThread *thread = nullptr;
 
 public:
-	DirectSoundPlayer(AudioProvider *provider);
+	DirectSoundPlayer(AudioProvider *provider, wxWindow *parent);
 	~DirectSoundPlayer();
 
 	void Play(int64_t start,int64_t count);
@@ -99,7 +99,7 @@ public:
 	void SetVolume(double vol) { volume = vol; }
 };
 
-DirectSoundPlayer::DirectSoundPlayer(AudioProvider *provider)
+DirectSoundPlayer::DirectSoundPlayer(AudioProvider *provider, wxWindow *parent)
 : AudioPlayer(provider)
 {
 	// Initialize the DirectSound object
@@ -108,7 +108,7 @@ DirectSoundPlayer::DirectSoundPlayer(AudioProvider *provider)
 	if (FAILED(res)) throw agi::AudioPlayerOpenError("Failed initializing DirectSound", 0);
 
 	// Set DirectSound parameters
-	directSound->SetCooperativeLevel((HWND)wxGetApp().frame->GetHandle(),DSSCL_PRIORITY);
+	directSound->SetCooperativeLevel((HWND)parent->GetHandle(),DSSCL_PRIORITY);
 
 	// Create the wave format structure
 	WAVEFORMATEX waveFormat;
@@ -370,8 +370,8 @@ void DirectSoundPlayerThread::Stop() {
 }
 }
 
-std::unique_ptr<AudioPlayer> CreateDirectSoundPlayer(AudioProvider *provider) {
-	return agi::util::make_unique<DirectSoundPlayer>(provider);
+std::unique_ptr<AudioPlayer> CreateDirectSoundPlayer(AudioProvider *provider, wxWindow *parent) {
+	return agi::util::make_unique<DirectSoundPlayer>(provider, parent);
 }
 
 #endif // WITH_DIRECTSOUND
diff --git a/src/audio_player_dsound2.cpp b/src/audio_player_dsound2.cpp
index 9952b4d62..ca36e6236 100644
--- a/src/audio_player_dsound2.cpp
+++ b/src/audio_player_dsound2.cpp
@@ -77,7 +77,7 @@ class DirectSoundPlayer2 final : public AudioPlayer {
 
 public:
 	/// @brief Constructor
-	DirectSoundPlayer2(AudioProvider *provider);
+	DirectSoundPlayer2(AudioProvider *provider, wxWindow *parent);
 	/// @brief Destructor
 	~DirectSoundPlayer2();
 
@@ -144,40 +144,15 @@ struct COMInitialization {
 	}
 };
 
-/// @class COMObjectRetainer
-/// @brief Simple auto_ptr-like class for COM objects
-template<class T>
-struct COMObjectRetainer {
-	/// Managed object
-	T *obj;
-
-	/// @brief Constructor for null object
-	COMObjectRetainer()
-	{
-		obj = 0;
-	}
-
-	/// @brief Constructor to take object immediately
-	/// @param _obj Object to manage
-	COMObjectRetainer(T *_obj)
-	{
-		obj = _obj;
-	}
-
-	/// @brief Destructor, releases object if there is one
-	~COMObjectRetainer()
-	{
+struct ReleaseCOMObject {
+	void operator()(IUnknown *obj) {
 		if (obj) obj->Release();
 	}
-
-	/// @brief Dereference the managed object
-	/// @return The managed object
-	T * operator -> ()
-	{
-		return obj;
-	}
 };
 
+template<typename T>
+using COMObjectRetainer = std::unique_ptr<T, ReleaseCOMObject>;
+
 /// @brief RAII wrapper around Win32 HANDLE type
 struct Win32KernelHandle final : public agi::scoped_holder<HANDLE, BOOL (__stdcall *)(HANDLE)> {
 	/// @brief Create with a managed handle
@@ -219,6 +194,8 @@ class DirectSoundPlayer2Thread {
 	/// @brief Check for error state and throw exception if one occurred
 	void CheckError();
 
+	HWND parent;
+
 	/// Win32 handle to the thread
 	Win32KernelHandle thread_handle;
 
@@ -277,7 +254,7 @@ public:
 	/// @param provider       Audio provider to take sample data from
 	/// @param WantedLatency Desired length in milliseconds to write ahead of the playback cursor
 	/// @param BufferLength  Multiplier for WantedLatency to get total buffer length
-	DirectSoundPlayer2Thread(AudioProvider *provider, int WantedLatency, int BufferLength);
+	DirectSoundPlayer2Thread(AudioProvider *provider, int WantedLatency, int BufferLength, wxWindow *parent);
 	/// @brief Destructor, waits for thread to have died
 	~DirectSoundPlayer2Thread();
 
@@ -340,15 +317,15 @@ void DirectSoundPlayer2Thread::Run()
 	catch (std::exception e)
 		REPORT_ERROR("Could not initialise COM")
 
-
 	// Create DirectSound object
-	COMObjectRetainer<IDirectSound8> ds;
-	if (FAILED(DirectSoundCreate8(&DSDEVID_DefaultPlayback, &ds.obj, nullptr)))
+	IDirectSound8 *ds_raw = nullptr;
+	if (FAILED(DirectSoundCreate8(&DSDEVID_DefaultPlayback, &ds_raw, nullptr)))
 		REPORT_ERROR("Cound not create DirectSound object")
 
+	COMObjectRetainer<IDirectSound8> ds(ds_raw);
 
 	// Ensure we can get interesting wave formats (unless we have PRIORITY we can only use a standard 8 bit format)
-	ds->SetCooperativeLevel((HWND)static_cast<AegisubApp*>(wxApp::GetInstance())->frame->GetHandle(), DSSCL_PRIORITY);
+	ds->SetCooperativeLevel(parent, DSSCL_PRIORITY);
 
 	// Describe the wave format
 	WAVEFORMATEX waveFormat;
@@ -379,9 +356,10 @@ void DirectSoundPlayer2Thread::Run()
 		REPORT_ERROR("Could not create buffer")
 
 	// But it's an old version interface we get, query it for the DSound8 interface
-	COMObjectRetainer<IDirectSoundBuffer8> bfr;
-	if (FAILED(bfr7->QueryInterface(IID_IDirectSoundBuffer8, (LPVOID*)&bfr.obj)))
+	IDirectSoundBuffer8 *bfr_raw = nullptr;
+	if (FAILED(bfr7->QueryInterface(IID_IDirectSoundBuffer8, (LPVOID*)&bfr_raw)))
 		REPORT_ERROR("Buffer doesn't support version 8 interface")
+	COMObjectRetainer<IDirectSoundBuffer8> bfr(bfr_raw);
 	bfr7->Release();
 	bfr7 = 0;
 
@@ -447,7 +425,7 @@ void DirectSoundPlayer2Thread::Run()
 				// Clear the buffer in case we can't fill it completely
 				memset(buf, 0, buf_size);
 
-				DWORD bytes_filled = FillAndUnlockBuffers(buf, buf_size, 0, 0, next_input_frame, bfr.obj);
+				DWORD bytes_filled = FillAndUnlockBuffers(buf, buf_size, 0, 0, next_input_frame, bfr.get());
 				buffer_offset += bytes_filled;
 				if (buffer_offset >= bufSize) buffer_offset -= bufSize;
 
@@ -575,7 +553,7 @@ do_fill_buffer:
 					break;
 				}
 
-				DWORD bytes_filled = FillAndUnlockBuffers(buf1, buf1sz, buf2, buf2sz, next_input_frame, bfr.obj);
+				DWORD bytes_filled = FillAndUnlockBuffers(buf1, buf1sz, buf2, buf2sz, next_input_frame, bfr.get());
 				buffer_offset += bytes_filled;
 				if (buffer_offset >= bufSize) buffer_offset -= bufSize;
 
@@ -694,8 +672,9 @@ void DirectSoundPlayer2Thread::CheckError()
 	}
 }
 
-DirectSoundPlayer2Thread::DirectSoundPlayer2Thread(AudioProvider *provider, int WantedLatency, int BufferLength)
-: event_start_playback  (CreateEvent(0, FALSE, FALSE, 0))
+DirectSoundPlayer2Thread::DirectSoundPlayer2Thread(AudioProvider *provider, int WantedLatency, int BufferLength, wxWindow *parent)
+: parent((HWND)parent->GetHandle())
+, event_start_playback  (CreateEvent(0, FALSE, FALSE, 0))
 , event_stop_playback   (CreateEvent(0, FALSE, FALSE, 0))
 , event_update_end_time (CreateEvent(0, FALSE, FALSE, 0))
 , event_set_volume      (CreateEvent(0, FALSE, FALSE, 0))
@@ -833,7 +812,7 @@ bool DirectSoundPlayer2Thread::IsDead()
 	}
 }
 
-DirectSoundPlayer2::DirectSoundPlayer2(AudioProvider *provider)
+DirectSoundPlayer2::DirectSoundPlayer2(AudioProvider *provider, wxWindow *parent)
 : AudioPlayer(provider)
 {
 	// The buffer will hold BufferLength times WantedLatency milliseconds of audio
@@ -848,7 +827,7 @@ DirectSoundPlayer2::DirectSoundPlayer2(AudioProvider *provider)
 
 	try
 	{
-		thread = agi::util::make_unique<DirectSoundPlayer2Thread>(provider, WantedLatency, BufferLength);
+		thread = agi::util::make_unique<DirectSoundPlayer2Thread>(provider, WantedLatency, BufferLength, parent);
 	}
 	catch (const char *msg)
 	{
@@ -962,8 +941,8 @@ void DirectSoundPlayer2::SetVolume(double vol)
 }
 }
 
-std::unique_ptr<AudioPlayer> CreateDirectSound2Player(AudioProvider *provider) {
-	return agi::util::make_unique<DirectSoundPlayer2>(provider);
+std::unique_ptr<AudioPlayer> CreateDirectSound2Player(AudioProvider *provider, wxWindow *parent) {
+	return agi::util::make_unique<DirectSoundPlayer2>(provider, parent);
 }
 
 #endif // WITH_DIRECTSOUND
diff --git a/src/audio_player_openal.cpp b/src/audio_player_openal.cpp
index b44cb3cd0..253ed2289 100644
--- a/src/audio_player_openal.cpp
+++ b/src/audio_player_openal.cpp
@@ -286,7 +286,7 @@ int64_t OpenALPlayer::GetCurrentPosition()
 }
 }
 
-std::unique_ptr<AudioPlayer> CreateOpenALPlayer(AudioProvider *provider)
+std::unique_ptr<AudioPlayer> CreateOpenALPlayer(AudioProvider *provider, wxWindow *)
 {
 	return agi::util::make_unique<OpenALPlayer>(provider);
 }
diff --git a/src/audio_player_oss.cpp b/src/audio_player_oss.cpp
index 0b7d4f156..bef741ded 100644
--- a/src/audio_player_oss.cpp
+++ b/src/audio_player_oss.cpp
@@ -283,7 +283,7 @@ int64_t OSSPlayer::GetCurrentPosition()
 }
 }
 
-std::unique_ptr<AudioPlayer> CreateOSSPlayer(AudioProvider *provider) {
+std::unique_ptr<AudioPlayer> CreateOSSPlayer(AudioProvider *provider, wxWindow *) {
     return agi::util::make_unique<OSSPlayer>(provider);
 }
 
diff --git a/src/audio_player_portaudio.cpp b/src/audio_player_portaudio.cpp
index 822705fb8..ec7e88af6 100644
--- a/src/audio_player_portaudio.cpp
+++ b/src/audio_player_portaudio.cpp
@@ -283,7 +283,7 @@ bool PortAudioPlayer::IsPlaying() {
 	return !!Pa_IsStreamActive(stream);
 }
 
-std::unique_ptr<AudioPlayer> CreatePortAudioPlayer(AudioProvider *provider) {
+std::unique_ptr<AudioPlayer> CreatePortAudioPlayer(AudioProvider *provider, wxWindow *) {
 	return agi::util::make_unique<PortAudioPlayer>(provider);
 }
 
diff --git a/src/audio_player_pulse.cpp b/src/audio_player_pulse.cpp
index 2d601e48d..15a4f262a 100644
--- a/src/audio_player_pulse.cpp
+++ b/src/audio_player_pulse.cpp
@@ -335,7 +335,7 @@ void PulseAudioPlayer::pa_stream_notify(pa_stream *p, PulseAudioPlayer *thread)
 }
 }
 
-std::unique_ptr<AudioPlayer> CreatePulseAudioPlayer(AudioProvider *provider) {
+std::unique_ptr<AudioPlayer> CreatePulseAudioPlayer(AudioProvider *provider, wxWindow *) {
 	return agi::util::make_unique<PulseAudioPlayer>(provider);
 }
 #endif // WITH_LIBPULSE
diff --git a/src/audio_provider.cpp b/src/audio_provider.cpp
index 50c717749..41e3da0b5 100644
--- a/src/audio_provider.cpp
+++ b/src/audio_provider.cpp
@@ -37,13 +37,13 @@
 #include "include/aegisub/audio_provider.h"
 
 #include "audio_controller.h"
-#include "dialog_progress.h"
 #include "factory_manager.h"
 #include "frame_main.h"
 #include "main.h"
 #include "options.h"
 #include "utils.h"
 
+#include <libaegisub/background_runner.h>
 #include <libaegisub/fs.h>
 #include <libaegisub/log.h>
 #include <libaegisub/util.h>
@@ -104,10 +104,10 @@ void AudioProvider::GetAudio(void *buf, int64_t start, int64_t count) const {
 	}
 }
 
-std::unique_ptr<AudioProvider> CreateDummyAudioProvider(agi::fs::path const& filename);
-std::unique_ptr<AudioProvider> CreatePCMAudioProvider(agi::fs::path const& filename);
-std::unique_ptr<AudioProvider> CreateAvisynthAudioProvider(agi::fs::path const& filename);
-std::unique_ptr<AudioProvider> CreateFFmpegSourceAudioProvider(agi::fs::path const& filename);
+std::unique_ptr<AudioProvider> CreateDummyAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *);
+std::unique_ptr<AudioProvider> CreatePCMAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *);
+std::unique_ptr<AudioProvider> CreateAvisynthAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *);
+std::unique_ptr<AudioProvider> CreateFFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *);
 
 std::unique_ptr<AudioProvider> CreateConvertAudioProvider(std::unique_ptr<AudioProvider> source_provider);
 std::unique_ptr<AudioProvider> CreateLockAudioProvider(std::unique_ptr<AudioProvider> source_provider);
@@ -117,7 +117,7 @@ std::unique_ptr<AudioProvider> CreateRAMAudioProvider(std::unique_ptr<AudioProvi
 namespace {
 	struct factory {
 		const char *name;
-		std::unique_ptr<AudioProvider> (*create)(agi::fs::path const&);
+		std::unique_ptr<AudioProvider> (*create)(agi::fs::path const&, agi::BackgroundRunner *);
 		bool hidden;
 	};
 
@@ -137,7 +137,7 @@ std::vector<std::string> AudioProviderFactory::GetClasses() {
 	return ::GetClasses(boost::make_iterator_range(std::begin(providers), std::end(providers)));
 }
 
-std::unique_ptr<AudioProvider> AudioProviderFactory::GetProvider(agi::fs::path const& filename) {
+std::unique_ptr<AudioProvider> AudioProviderFactory::GetProvider(agi::fs::path const& filename, agi::BackgroundRunner *br) {
 	auto preferred = OPT_GET("Audio/Provider")->GetString();
 	auto sorted = GetSorted(boost::make_iterator_range(std::begin(providers), std::end(providers)), preferred);
 
@@ -148,7 +148,7 @@ std::unique_ptr<AudioProvider> AudioProviderFactory::GetProvider(agi::fs::path c
 
 	for (auto const& factory : sorted) {
 		try {
-			provider = factory->create(filename);
+			provider = factory->create(filename, br);
 			if (!provider) continue;
 			LOG_I("audio_provider") << "Using audio provider: " << factory->name;
 			break;
@@ -189,13 +189,11 @@ std::unique_ptr<AudioProvider> AudioProviderFactory::GetProvider(agi::fs::path c
 	if (!cache || !needsCache)
 		return CreateLockAudioProvider(std::move(provider));
 
-	DialogProgress progress(wxGetApp().frame, _("Load audio"));
-
 	// Convert to RAM
-	if (cache == 1) return CreateRAMAudioProvider(std::move(provider), &progress);
+	if (cache == 1) return CreateRAMAudioProvider(std::move(provider), br);
 
 	// Convert to HD
-	if (cache == 2) return CreateHDAudioProvider(std::move(provider), &progress);
+	if (cache == 2) return CreateHDAudioProvider(std::move(provider), br);
 
 	throw agi::AudioCacheOpenError("Unknown caching method", nullptr);
 }
diff --git a/src/audio_provider_avs.cpp b/src/audio_provider_avs.cpp
index a46d6d123..06fdd6be2 100644
--- a/src/audio_provider_avs.cpp
+++ b/src/audio_provider_avs.cpp
@@ -147,7 +147,7 @@ void AvisynthAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count)
 }
 }
 
-std::unique_ptr<AudioProvider> CreateAvisynthAudioProvider(agi::fs::path const& file) {
+std::unique_ptr<AudioProvider> CreateAvisynthAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *) {
 	return agi::util::make_unique<AvisynthAudioProvider>(file);
 }
 #endif
diff --git a/src/audio_provider_dummy.cpp b/src/audio_provider_dummy.cpp
index f308ece72..a68bd7f36 100644
--- a/src/audio_provider_dummy.cpp
+++ b/src/audio_provider_dummy.cpp
@@ -88,7 +88,7 @@ public:
 };
 }
 
-std::unique_ptr<AudioProvider> CreateDummyAudioProvider(agi::fs::path const& file) {
+std::unique_ptr<AudioProvider> CreateDummyAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *) {
 	if (!boost::starts_with(file.string(), "dummy-audio:"))
 		return {};
 	return agi::util::make_unique<DummyAudioProvider>(file);
diff --git a/src/audio_provider_ffmpegsource.cpp b/src/audio_provider_ffmpegsource.cpp
index 1cf95f93c..85077897d 100644
--- a/src/audio_provider_ffmpegsource.cpp
+++ b/src/audio_provider_ffmpegsource.cpp
@@ -61,15 +61,16 @@ class FFmpegSourceAudioProvider final : public AudioProvider, FFmpegSourceProvid
 	}
 
 public:
-	FFmpegSourceAudioProvider(agi::fs::path const& filename);
+	FFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *br);
 
 	bool NeedsCache() const override { return true; }
 };
 
 /// @brief Constructor
 /// @param filename The filename to open
-FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(agi::fs::path const& filename) try
-: AudioSource(nullptr, FFMS_DestroyAudioSource)
+FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *br) try
+: FFmpegSourceProvider(br)
+, AudioSource(nullptr, FFMS_DestroyAudioSource)
 {
 	ErrInfo.Buffer		= FFMSErrMsg;
 	ErrInfo.BufferSize	= sizeof(FFMSErrMsg);
@@ -206,8 +207,8 @@ void FFmpegSourceAudioProvider::LoadAudio(agi::fs::path const& filename) {
 
 }
 
-std::unique_ptr<AudioProvider> CreateFFmpegSourceAudioProvider(agi::fs::path const& file) {
-	return agi::util::make_unique<FFmpegSourceAudioProvider>(file);
+std::unique_ptr<AudioProvider> CreateFFmpegSourceAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *br) {
+	return agi::util::make_unique<FFmpegSourceAudioProvider>(file, br);
 }
 
 #endif /* WITH_FFMS2 */
diff --git a/src/audio_provider_hd.cpp b/src/audio_provider_hd.cpp
index 4c7f31e25..defea3b1d 100644
--- a/src/audio_provider_hd.cpp
+++ b/src/audio_provider_hd.cpp
@@ -66,6 +66,7 @@ public:
 
 		file = agi::util::make_unique<agi::temp_file_mapping>(cache_dir / filename, num_samples * bps);
 		br->Run([&] (agi::ProgressSink *ps) {
+			ps->SetTitle(from_wx(_("Load audio")));
 			ps->SetMessage(from_wx(_("Reading to Hard Disk cache")));
 
 			int64_t block = 65536;
diff --git a/src/audio_provider_lock.cpp b/src/audio_provider_lock.cpp
index ed82755e9..8e6825640 100644
--- a/src/audio_provider_lock.cpp
+++ b/src/audio_provider_lock.cpp
@@ -44,4 +44,4 @@ public:
 
 std::unique_ptr<AudioProvider> CreateLockAudioProvider(std::unique_ptr<AudioProvider> src) {
 	return agi::util::make_unique<LockAudioProvider>(std::move(src));
-}
\ No newline at end of file
+}
diff --git a/src/audio_provider_pcm.cpp b/src/audio_provider_pcm.cpp
index 15cc664ef..10702dd4b 100644
--- a/src/audio_provider_pcm.cpp
+++ b/src/audio_provider_pcm.cpp
@@ -358,7 +358,7 @@ public:
 	}
 };
 
-std::unique_ptr<AudioProvider> CreatePCMAudioProvider(agi::fs::path const& filename) {
+std::unique_ptr<AudioProvider> CreatePCMAudioProvider(agi::fs::path const& filename, agi::BackgroundRunner *) {
 	bool wrong_file_type = true;
 	std::string msg;
 
diff --git a/src/audio_provider_ram.cpp b/src/audio_provider_ram.cpp
index 72450b059..9b0df16d8 100644
--- a/src/audio_provider_ram.cpp
+++ b/src/audio_provider_ram.cpp
@@ -72,6 +72,7 @@ public:
 		}
 
 		br->Run([&](agi::ProgressSink *ps) {
+			ps->SetTitle(from_wx(_("Load audio")));
 			ps->SetMessage(from_wx(_("Reading into RAM")));
 
 			int64_t readsize = CacheBlockSize / source->GetBytesPerSample();
diff --git a/src/command/app.cpp b/src/command/app.cpp
index 3242f6676..6e0a1f57f 100644
--- a/src/command/app.cpp
+++ b/src/command/app.cpp
@@ -76,16 +76,16 @@ struct app_display_audio_subs final : public Command {
 	STR_HELP("Display audio and the subtitles grid only")
 	CMD_TYPE(COMMAND_VALIDATE | COMMAND_RADIO)
 
-	void operator()(agi::Context *) override {
-		wxGetApp().frame->SetDisplayMode(0,1);
+	void operator()(agi::Context *c) override {
+		c->frame->SetDisplayMode(0,1);
 	}
 
 	bool Validate(const agi::Context *c) override {
 		return c->audioController->IsAudioOpen();
 	}
 
-	bool IsActive(const agi::Context *) override {
-		return wxGetApp().frame->IsAudioShown() && !wxGetApp().frame->IsVideoShown();
+	bool IsActive(const agi::Context *c) override {
+		return c->frame->IsAudioShown() && !c->frame->IsVideoShown();
 	}
 };
 
@@ -97,15 +97,15 @@ struct app_display_full final : public Command {
 	CMD_TYPE(COMMAND_VALIDATE | COMMAND_RADIO)
 
 	void operator()(agi::Context *c) override {
-		wxGetApp().frame->SetDisplayMode(1,1);
+		c->frame->SetDisplayMode(1,1);
 	}
 
 	bool Validate(const agi::Context *c) override {
 		return c->audioController->IsAudioOpen() && c->videoController->IsLoaded() && !c->dialog->Get<DialogDetachedVideo>();
 	}
 
-	bool IsActive(const agi::Context *) override {
-		return wxGetApp().frame->IsAudioShown() && wxGetApp().frame->IsVideoShown();
+	bool IsActive(const agi::Context *c) override {
+		return c->frame->IsAudioShown() && c->frame->IsVideoShown();
 	}
 };
 
@@ -117,11 +117,11 @@ struct app_display_subs final : public Command {
 	CMD_TYPE(COMMAND_VALIDATE | COMMAND_RADIO)
 
 	void operator()(agi::Context *c) override {
-		wxGetApp().frame->SetDisplayMode(0,0);
+		c->frame->SetDisplayMode(0,0);
 	}
 
-	bool IsActive(const agi::Context *) override {
-		return !wxGetApp().frame->IsAudioShown() && !wxGetApp().frame->IsVideoShown();
+	bool IsActive(const agi::Context *c) override {
+		return !c->frame->IsAudioShown() && !c->frame->IsVideoShown();
 	}
 };
 
@@ -133,15 +133,15 @@ struct app_display_video_subs final : public Command {
 	CMD_TYPE(COMMAND_VALIDATE | COMMAND_RADIO)
 
 	void operator()(agi::Context *c) override {
-		wxGetApp().frame->SetDisplayMode(1,0);
+		c->frame->SetDisplayMode(1,0);
 	}
 
 	bool Validate(const agi::Context *c) override {
 		return c->videoController->IsLoaded() && !c->dialog->Get<DialogDetachedVideo>();
 	}
 
-	bool IsActive(const agi::Context *) override {
-		return !wxGetApp().frame->IsAudioShown() && wxGetApp().frame->IsVideoShown();
+	bool IsActive(const agi::Context *c) override {
+		return !c->frame->IsAudioShown() && c->frame->IsVideoShown();
 	}
 };
 
@@ -152,7 +152,7 @@ struct app_exit final : public Command {
 	STR_HELP("Exit the application")
 
 	void operator()(agi::Context *c) override {
-		wxGetApp().frame->Close();
+		c->frame->Close();
 	}
 };
 
@@ -174,7 +174,7 @@ struct app_language final : public Command {
 		int result = wxMessageBox("Aegisub needs to be restarted so that the new language can be applied. Restart now?", "Restart Aegisub?", wxYES_NO | wxICON_QUESTION |  wxCENTER);
 		if (result == wxYES) {
 			// Restart Aegisub
-			if (wxGetApp().frame->Close()) {
+			if (c->frame->Close()) {
 				RestartAegisub();
 			}
 		}
@@ -200,7 +200,7 @@ struct app_new_window final : public Command {
 	STR_DISP("New Window")
 	STR_HELP("Open a new application window")
 
-	void operator()(agi::Context *) override {
+	void operator()(agi::Context *c) override {
 		RestartAegisub();
 	}
 };
@@ -229,11 +229,11 @@ struct app_toggle_global_hotkeys final : public Command {
 	STR_HELP("Toggle global hotkey overrides (Medusa Mode)")
 	CMD_TYPE(COMMAND_TOGGLE)
 
-	bool IsActive(const agi::Context *) override {
+	bool IsActive(const agi::Context *c) override {
 		return OPT_GET("Audio/Medusa Timing Hotkeys")->GetBool();
 	}
 
-	void operator()(agi::Context *) override {
+	void operator()(agi::Context *c) override {
 		agi::OptionValue *opt = OPT_SET("Audio/Medusa Timing Hotkeys");
 		opt->SetBool(!opt->GetBool());
 	}
@@ -244,17 +244,17 @@ struct app_toggle_toolbar final : public Command {
 	STR_HELP("Toggle the main toolbar")
 	CMD_TYPE(COMMAND_DYNAMIC_NAME)
 
-	wxString StrMenu(const agi::Context *) const override {
+	wxString StrMenu(const agi::Context *c) const override {
 		return OPT_GET("App/Show Toolbar")->GetBool() ?
 			_("Hide Toolbar") :
 			_("Show Toolbar");
 	}
 
-	wxString StrDisplay(const agi::Context *) const override {
+	wxString StrDisplay(const agi::Context *c) const override {
 		return StrMenu(nullptr);
 	}
 
-	void operator()(agi::Context *) override {
+	void operator()(agi::Context *c) override {
 		agi::OptionValue *opt = OPT_SET("App/Show Toolbar");
 		opt->SetBool(!opt->GetBool());
 	}
@@ -266,7 +266,7 @@ struct app_updates final : public Command {
 	STR_DISP("Check for Updates")
 	STR_HELP("Check to see if there is a new version of Aegisub available")
 
-	void operator()(agi::Context *) override {
+	void operator()(agi::Context *c) override {
 		PerformVersionCheck(true);
 	}
 };
diff --git a/src/command/automation.cpp b/src/command/automation.cpp
index abdedbf11..a298c01de 100644
--- a/src/command/automation.cpp
+++ b/src/command/automation.cpp
@@ -58,7 +58,7 @@ struct reload_all final : public Command {
 	void operator()(agi::Context *c) override {
 		wxGetApp().global_scripts->Reload();
 		c->local_scripts->Reload();
-		StatusTimeout(_("Reloaded all Automation scripts"));
+		c->frame->StatusTimeout(_("Reloaded all Automation scripts"));
 	}
 };
 
@@ -70,7 +70,7 @@ struct reload_autoload final : public Command {
 
 	void operator()(agi::Context *c) override {
 		wxGetApp().global_scripts->Reload();
-		StatusTimeout(_("Reloaded autoload Automation scripts"));
+		c->frame->StatusTimeout(_("Reloaded autoload Automation scripts"));
 	}
 };
 
diff --git a/src/command/grid.cpp b/src/command/grid.cpp
index 0b89dbe84..af6fb3690 100644
--- a/src/command/grid.cpp
+++ b/src/command/grid.cpp
@@ -37,6 +37,7 @@
 #include "../ass_file.h"
 #include "../audio_controller.h"
 #include "../audio_timing.h"
+#include "../frame_main.h"
 #include "../include/aegisub/context.h"
 #include "../libresrc/libresrc.h"
 #include "../options.h"
@@ -257,7 +258,7 @@ struct grid_tag_cycle_hiding final : public Command {
 	STR_DISP("Cycle Tag Hiding Mode")
 	STR_HELP("Cycle through tag hiding modes")
 
-	void operator()(agi::Context *) override {
+	void operator()(agi::Context *c) override {
 		int tagMode = OPT_GET("Subtitle/Grid/Hide Overrides")->GetInt();
 
 		// Cycle to next
@@ -268,7 +269,7 @@ struct grid_tag_cycle_hiding final : public Command {
 		if (tagMode == 0) message = _("ASS Override Tag mode set to show full tags.");
 		if (tagMode == 1) message = _("ASS Override Tag mode set to simplify tags.");
 		if (tagMode == 2) message = _("ASS Override Tag mode set to hide tags.");
-		StatusTimeout(message,10000);
+		c->frame->StatusTimeout(message,10000);
 
 		// Set option
 		OPT_SET("Subtitle/Grid/Hide Overrides")->SetInt(tagMode);
diff --git a/src/command/video.cpp b/src/command/video.cpp
index 5cb4d9910..91321f7b7 100644
--- a/src/command/video.cpp
+++ b/src/command/video.cpp
@@ -99,7 +99,7 @@ struct video_aspect_cinematic final : public validator_video_loaded {
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
 		c->videoController->SetAspectRatio(AspectRatio::Cinematic);
-		wxGetApp().frame->SetDisplayMode(1,-1);
+		c->frame->SetDisplayMode(1,-1);
 	}
 };
 
@@ -141,7 +141,7 @@ struct video_aspect_custom final : public validator_video_loaded {
 			wxMessageBox(_("Invalid value! Aspect ratio must be between 0.5 and 5.0."),_("Invalid Aspect Ratio"),wxOK | wxICON_ERROR | wxCENTER);
 		else {
 			c->videoController->SetAspectRatio(numval);
-			wxGetApp().frame->SetDisplayMode(1,-1);
+			c->frame->SetDisplayMode(1,-1);
 		}
 	}
 };
@@ -160,7 +160,7 @@ struct video_aspect_default final : public validator_video_loaded {
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
 		c->videoController->SetAspectRatio(AspectRatio::Default);
-		wxGetApp().frame->SetDisplayMode(1,-1);
+		c->frame->SetDisplayMode(1,-1);
 	}
 };
 
@@ -178,7 +178,7 @@ struct video_aspect_full final : public validator_video_loaded {
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
 		c->videoController->SetAspectRatio(AspectRatio::Fullscreen);
-		wxGetApp().frame->SetDisplayMode(1,-1);
+		c->frame->SetDisplayMode(1,-1);
 	}
 };
 
@@ -196,7 +196,7 @@ struct video_aspect_wide final : public validator_video_loaded {
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
 		c->videoController->SetAspectRatio(AspectRatio::Widescreen);
-		wxGetApp().frame->SetDisplayMode(1,-1);
+		c->frame->SetDisplayMode(1,-1);
 	}
 };
 
@@ -238,7 +238,7 @@ struct video_cycle_subtitles_provider final : public cmd::Command {
 		if (it == end(providers)) it = begin(providers);
 
 		OPT_SET("Subtitle/Provider")->SetString(*it);
-		StatusTimeout(wxString::Format(_("Subtitles provider set to %s"), to_wx(*it)), 5000);
+		c->frame->StatusTimeout(wxString::Format(_("Subtitles provider set to %s"), to_wx(*it)), 5000);
 	}
 };
 
diff --git a/src/dialog_selection.cpp b/src/dialog_selection.cpp
index 1222d9390..fb22f522a 100644
--- a/src/dialog_selection.cpp
+++ b/src/dialog_selection.cpp
@@ -26,6 +26,7 @@
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "compat.h"
+#include "frame_main.h"
 #include "help_button.h"
 #include "include/aegisub/context.h"
 #include "libresrc/libresrc.h"
@@ -223,7 +224,7 @@ void DialogSelection::Process(wxCommandEvent&) {
 	if (count == 0)
 		wxMessageBox(message, _("Selection"), wxOK | wxCENTER, this);
 	else
-		StatusTimeout(message);
+		con->frame->StatusTimeout(message);
 
 	AssDialogue *new_active = con->selectionController->GetActiveLine();
 	if (new_sel.size() && !new_sel.count(new_active))
diff --git a/src/ffmpegsource_common.cpp b/src/ffmpegsource_common.cpp
index 868b1e7b5..d8761975e 100644
--- a/src/ffmpegsource_common.cpp
+++ b/src/ffmpegsource_common.cpp
@@ -38,12 +38,12 @@
 #include "ffmpegsource_common.h"
 
 #include "compat.h"
-#include "dialog_progress.h"
 #include "frame_main.h"
 #include "main.h"
 #include "options.h"
 #include "utils.h"
 
+#include <libaegisub/background_runner.h>
 #include <libaegisub/fs.h>
 #include <libaegisub/path.h>
 #include <libaegisub/log.h>
@@ -66,8 +66,9 @@ static void deinit_com(bool) {
 static void deinit_com(bool) { }
 #endif
 
-FFmpegSourceProvider::FFmpegSourceProvider()
+FFmpegSourceProvider::FFmpegSourceProvider(agi::BackgroundRunner *br)
 : COMInited(false, deinit_com)
+, br(br)
 {
 #ifdef _WIN32
 	HRESULT res = CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
@@ -85,9 +86,6 @@ FFmpegSourceProvider::FFmpegSourceProvider()
 /// @param Indexer		A pointer to the indexer object representing the file to be indexed
 /// @param CacheName    The filename of the output index file
 /// @param Trackmask    A binary mask of the track numbers to index
-/// @param IgnoreDecodeErrors	True if audio decoding errors will be tolerated, false otherwise
-/// @return				Returns the index object on success, nullptr otherwise
-///
 FFMS_Index *FFmpegSourceProvider::DoIndexing(FFMS_Indexer *Indexer, agi::fs::path const& CacheName, int Trackmask, FFMS_IndexErrorHandling IndexEH) {
 	char FFMSErrMsg[1024];
 	FFMS_ErrorInfo ErrInfo;
@@ -97,12 +95,11 @@ FFMS_Index *FFmpegSourceProvider::DoIndexing(FFMS_Indexer *Indexer, agi::fs::pat
 	ErrInfo.SubType		= FFMS_ERROR_SUCCESS;
 	std::string MsgString;
 
-	// set up progress dialog callback
-	DialogProgress Progress(wxGetApp().frame, _("Indexing"), _("Reading timecodes and frame/sample data"));
-
 	// index all audio tracks
 	FFMS_Index *Index;
-	Progress.Run([&](agi::ProgressSink *ps) {
+	br->Run([&](agi::ProgressSink *ps) {
+		ps->SetTitle(from_wx(_("Indexing")));
+		ps->SetMessage(from_wx(_("Reading timecodes and frame/sample data")));
 		struct progress {
 			agi::ProgressSink *ps;
 			int calls;
diff --git a/src/ffmpegsource_common.h b/src/ffmpegsource_common.h
index 46f21948f..5ef44b6ec 100644
--- a/src/ffmpegsource_common.h
+++ b/src/ffmpegsource_common.h
@@ -40,6 +40,8 @@
 #include <libaegisub/fs_fwd.h>
 #include <libaegisub/scoped_ptr.h>
 
+namespace agi { class BackgroundRunner; }
+
 /// Index all tracks
 #define FFMS_TRACKMASK_ALL		-1
 /// Index no tracks
@@ -50,9 +52,10 @@
 class FFmpegSourceProvider {
 	friend class FFmpegSourceCacheCleaner;
 	agi::scoped_holder<bool> COMInited; ///< COM initialization state
+	agi::BackgroundRunner *br;
 
 public:
-	FFmpegSourceProvider();
+	FFmpegSourceProvider(agi::BackgroundRunner *br);
 
 	/// Logging level constants from avutil/log.h
 	enum FFMS_LogLevel {
diff --git a/src/frame_main.cpp b/src/frame_main.cpp
index 3b60b1e55..bf1a902fe 100644
--- a/src/frame_main.cpp
+++ b/src/frame_main.cpp
@@ -229,6 +229,7 @@ FrameMain::FrameMain()
 
 	StartupLog("Initializing context frames");
 	context->parent = this;
+	context->frame = this;
 	context->previousFocus = nullptr;
 
 	StartupLog("Install PNG handler");
diff --git a/src/frame_main.h b/src/frame_main.h
index f19e18fd9..497e75e28 100644
--- a/src/frame_main.h
+++ b/src/frame_main.h
@@ -49,7 +49,7 @@ class VideoBox;
 
 namespace agi { struct Context; class OptionValue; }
 
-class FrameMain: public wxFrame {
+class FrameMain : public wxFrame {
 	friend class AegisubApp;
 	friend class AegisubFileDropTarget;
 
diff --git a/src/include/aegisub/audio_player.h b/src/include/aegisub/audio_player.h
index 0a5ac9693..7638633f8 100644
--- a/src/include/aegisub/audio_player.h
+++ b/src/include/aegisub/audio_player.h
@@ -40,6 +40,7 @@
 #include <vector>
 
 class AudioProvider;
+class wxWindow;
 
 class AudioPlayer {
 protected:
@@ -62,5 +63,5 @@ public:
 
 struct AudioPlayerFactory {
 	static std::vector<std::string> GetClasses();
-	static std::unique_ptr<AudioPlayer> GetAudioPlayer(AudioProvider *provider);
+	static std::unique_ptr<AudioPlayer> GetAudioPlayer(AudioProvider *provider, wxWindow *window);
 };
diff --git a/src/include/aegisub/audio_provider.h b/src/include/aegisub/audio_provider.h
index 0de3e45de..28eba2fcb 100644
--- a/src/include/aegisub/audio_provider.h
+++ b/src/include/aegisub/audio_provider.h
@@ -88,12 +88,14 @@ public:
 	}
 };
 
+namespace agi { class BackgroundRunner; }
+
 struct AudioProviderFactory {
 	static std::vector<std::string> GetClasses();
 
 	/// Get a provider for the file
 	/// @param filename URI to open
-	static std::unique_ptr<AudioProvider> GetProvider(agi::fs::path const& filename);
+	static std::unique_ptr<AudioProvider> GetProvider(agi::fs::path const& filename, agi::BackgroundRunner *br);
 };
 
 DEFINE_BASE_EXCEPTION_NOINNER(AudioProviderError, agi::Exception)
diff --git a/src/include/aegisub/context.h b/src/include/aegisub/context.h
index 2afdd77e5..4f037ba21 100644
--- a/src/include/aegisub/context.h
+++ b/src/include/aegisub/context.h
@@ -4,6 +4,7 @@ class AudioController;
 class AssDialogue;
 class AudioKaraoke;
 class DialogManager;
+class FrameMain;
 class SearchReplaceEngine;
 class InitialLineState;
 class SelectionController;
@@ -41,8 +42,9 @@ struct Context {
 	// Views (i.e. things that should eventually not be here at all)
 	AudioBox *audioBox;
 	AudioKaraoke *karaoke;
-	DialogManager *dialog;
 	BaseGrid *subsGrid;
+	DialogManager *dialog;
+	FrameMain *frame;
 	VideoDisplay *videoDisplay;
 };
 
diff --git a/src/include/aegisub/subtitles_provider.h b/src/include/aegisub/subtitles_provider.h
index e1041d336..e10b97752 100644
--- a/src/include/aegisub/subtitles_provider.h
+++ b/src/include/aegisub/subtitles_provider.h
@@ -48,7 +48,9 @@ public:
 	virtual void DrawSubtitles(VideoFrame &dst, double time)=0;
 };
 
+namespace agi { class BackgroundRunner; }
+
 struct SubtitlesProviderFactory {
-	static std::unique_ptr<SubtitlesProvider> GetProvider();
+	static std::unique_ptr<SubtitlesProvider> GetProvider(agi::BackgroundRunner *br);
 	static std::vector<std::string> GetClasses();
 };
diff --git a/src/main.h b/src/main.h
index 622dccd46..b28231e13 100644
--- a/src/main.h
+++ b/src/main.h
@@ -44,7 +44,9 @@ class FrameMain;
 
 namespace Automation4 { class AutoloadScriptManager; }
 
-class AegisubApp: public wxApp {
+class AegisubApp : public wxApp {
+	friend class FrameMain;
+
 	bool OnInit() override;
 	int OnExit() override;
 	int OnRun() override;
@@ -65,10 +67,10 @@ class AegisubApp: public wxApp {
 	// our ticket to catch exceptions happening in event handlers.
 	void HandleEvent(wxEvtHandler *handler, wxEventFunction func, wxEvent& event) const override;
 
+	FrameMain *frame;
 public:
 	AegisubApp();
 	AegisubLocale locale;
-	FrameMain *frame;
 	Automation4::AutoloadScriptManager *global_scripts;
 
 	// Apple events
diff --git a/src/subs_controller.cpp b/src/subs_controller.cpp
index 497eb97e1..94ed5ad4c 100644
--- a/src/subs_controller.cpp
+++ b/src/subs_controller.cpp
@@ -26,6 +26,7 @@
 #include "charset_detect.h"
 #include "compat.h"
 #include "command/command.h"
+#include "Frame_main.h"
 #include "include/aegisub/context.h"
 #include "options.h"
 #include "selection_controller.h"
@@ -138,13 +139,13 @@ SubsController::SubsController(agi::Context *context)
 		try {
 			auto fn = AutoSave();
 			if (!fn.empty())
-				StatusTimeout(wxString::Format(_("File backup saved as \"%s\"."), fn.wstring()));
+				context->frame->StatusTimeout(wxString::Format(_("File backup saved as \"%s\"."), fn.wstring()));
 		}
 		catch (const agi::Exception& err) {
-			StatusTimeout(to_wx("Exception when attempting to autosave file: " + err.GetMessage()));
+			context->frame->StatusTimeout(to_wx("Exception when attempting to autosave file: " + err.GetMessage()));
 		}
 		catch (...) {
-			StatusTimeout("Unhandled exception when attempting to autosave file.");
+			context->frame->StatusTimeout("Unhandled exception when attempting to autosave file.");
 		}
 	});
 }
diff --git a/src/subs_preview.cpp b/src/subs_preview.cpp
index 33d62ab46..85371e7a1 100644
--- a/src/subs_preview.cpp
+++ b/src/subs_preview.cpp
@@ -38,6 +38,7 @@
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_style.h"
+#include "dialog_progress.h"
 #include "subs_preview.h"
 #include "include/aegisub/subtitles_provider.h"
 #include "video_frame.h"
@@ -51,7 +52,7 @@
 SubtitlesPreview::SubtitlesPreview(wxWindow *parent, wxSize size, int winStyle, agi::Color col)
 : wxWindow(parent, -1, wxDefaultPosition, size, winStyle)
 , style(new AssStyle)
-, back_color(std::move(col))
+, back_color(col)
 , sub_file(agi::util::make_unique<AssFile>())
 , line(new AssDialogue)
 {
@@ -131,8 +132,10 @@ void SubtitlesPreview::OnSize(wxSizeEvent &evt) {
 	bmp = agi::util::make_unique<wxBitmap>(w, h, -1);
 	vid.reset(new DummyVideoProvider(0.0, 10, w, h, back_color, true));
 	try {
-		if (!provider)
-			provider = SubtitlesProviderFactory::GetProvider();
+		if (!provider) {
+			DialogProgress progress(this);
+			provider = SubtitlesProviderFactory::GetProvider(&progress);
+		}
 	}
 	catch (...) {
 		wxMessageBox(
diff --git a/src/subtitles_provider.cpp b/src/subtitles_provider.cpp
index 4468ae7a5..42d03ef2d 100644
--- a/src/subtitles_provider.cpp
+++ b/src/subtitles_provider.cpp
@@ -27,7 +27,7 @@ namespace {
 	struct factory {
 		std::string name;
 		std::string subtype;
-		std::unique_ptr<SubtitlesProvider> (*create)(std::string const& subtype);
+		std::unique_ptr<SubtitlesProvider> (*create)(std::string const& subtype, agi::BackgroundRunner *br);
 		bool hidden;
 	};
 
@@ -47,14 +47,14 @@ std::vector<std::string> SubtitlesProviderFactory::GetClasses() {
 	return ::GetClasses(factories());
 }
 
-std::unique_ptr<SubtitlesProvider> SubtitlesProviderFactory::GetProvider() {
+std::unique_ptr<SubtitlesProvider> SubtitlesProviderFactory::GetProvider(agi::BackgroundRunner *br) {
 	auto preferred = OPT_GET("Subtitle/Provider")->GetString();
 	auto sorted = GetSorted(factories(), preferred);
 
 	std::string error;
 	for (auto factory : sorted) {
 		try {
-			auto provider = factory->create(factory->subtype);
+			auto provider = factory->create(factory->subtype, br);
 			if (provider) return provider;
 		}
 		catch (agi::UserCancelException const&) { throw; }
diff --git a/src/subtitles_provider_csri.cpp b/src/subtitles_provider_csri.cpp
index 69f93c885..4d7b5fad1 100644
--- a/src/subtitles_provider_csri.cpp
+++ b/src/subtitles_provider_csri.cpp
@@ -139,7 +139,7 @@ std::vector<std::string> List() {
 	return final;
 }
 
-std::unique_ptr<SubtitlesProvider> Create(std::string const& name) {
+std::unique_ptr<SubtitlesProvider> Create(std::string const& name, agi::BackgroundRunner *) {
 	return agi::util::make_unique<CSRISubtitlesProvider>(name);
 }
 }
diff --git a/src/subtitles_provider_csri.h b/src/subtitles_provider_csri.h
index 6fe2f8728..ef5026f04 100644
--- a/src/subtitles_provider_csri.h
+++ b/src/subtitles_provider_csri.h
@@ -19,8 +19,9 @@
 #include <vector>
 
 class SubtitlesProvider;
+namespace agi { class BackgroundRunner; }
 
 namespace csri {
 	std::vector<std::string> List();
-	std::unique_ptr<SubtitlesProvider> Create(std::string const& subtype);
+	std::unique_ptr<SubtitlesProvider> Create(std::string const& subtype, agi::BackgroundRunner *br);
 }
diff --git a/src/subtitles_provider_libass.cpp b/src/subtitles_provider_libass.cpp
index ed163bd2b..404274089 100644
--- a/src/subtitles_provider_libass.cpp
+++ b/src/subtitles_provider_libass.cpp
@@ -40,13 +40,11 @@
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_style.h"
-#include "dialog_progress.h"
-#include "frame_main.h"
+#include "compat.h"
 #include "include/aegisub/subtitles_provider.h"
-#include "main.h"
-#include "utils.h"
 #include "video_frame.h"
 
+#include <libaegisub/background_runner.h>
 #include <libaegisub/dispatch.h>
 #include <libaegisub/log.h>
 #include <libaegisub/util.h>
@@ -95,14 +93,14 @@ class LibassSubtitlesProvider final : public SubtitlesProvider {
 	ASS_Track* ass_track = nullptr;
 
 public:
-	LibassSubtitlesProvider();
+	LibassSubtitlesProvider(agi::BackgroundRunner *br);
 	~LibassSubtitlesProvider();
 
 	void LoadSubtitles(AssFile *subs) override;
 	void DrawSubtitles(VideoFrame &dst, double time) override;
 };
 
-LibassSubtitlesProvider::LibassSubtitlesProvider() {
+LibassSubtitlesProvider::LibassSubtitlesProvider(agi::BackgroundRunner *br) {
 	auto done = std::make_shared<bool>(false);
 	auto renderer = std::make_shared<ASS_Renderer*>(nullptr);
 	cache_queue->Async([=]{
@@ -115,8 +113,9 @@ LibassSubtitlesProvider::LibassSubtitlesProvider() {
 		*renderer = ass_renderer;
 	});
 
-	DialogProgress progress(wxGetApp().frame, _("Updating font index"), _("This may take several minutes"));
-	progress.Run([=](agi::ProgressSink *ps) {
+	br->Run([=](agi::ProgressSink *ps) {
+		ps->SetTitle(from_wx(_("Updating font index")));
+		ps->SetMessage(from_wx(_("This may take several minutes")));
 		ps->SetIndeterminate();
 		while (!*done && !ps->IsCancelled())
 			agi::util::sleep_for(250);
@@ -205,8 +204,8 @@ void LibassSubtitlesProvider::DrawSubtitles(VideoFrame &frame,double time) {
 }
 
 namespace libass {
-std::unique_ptr<SubtitlesProvider> Create(std::string const&) {
-	return agi::util::make_unique<LibassSubtitlesProvider>();
+std::unique_ptr<SubtitlesProvider> Create(std::string const&, agi::BackgroundRunner *br) {
+	return agi::util::make_unique<LibassSubtitlesProvider>(br);
 }
 
 void CacheFonts() {
diff --git a/src/subtitles_provider_libass.h b/src/subtitles_provider_libass.h
index e5dbd57b5..8df333595 100644
--- a/src/subtitles_provider_libass.h
+++ b/src/subtitles_provider_libass.h
@@ -18,8 +18,9 @@
 #include <string>
 
 class SubtitlesProvider;
+namespace agi { class BackgroundRunner; }
 
 namespace libass {
-	std::unique_ptr<SubtitlesProvider> Create(std::string const&);
+	std::unique_ptr<SubtitlesProvider> Create(std::string const&, agi::BackgroundRunner *br);
 	void CacheFonts();
 }
diff --git a/src/threaded_frame_source.cpp b/src/threaded_frame_source.cpp
index 99f8850fb..428cf6d56 100644
--- a/src/threaded_frame_source.cpp
+++ b/src/threaded_frame_source.cpp
@@ -99,20 +99,20 @@ std::shared_ptr<VideoFrame> ThreadedFrameSource::ProcFrame(int frame_number, dou
 	return frame;
 }
 
-static std::unique_ptr<SubtitlesProvider> get_subs_provider(wxEvtHandler *parent) {
+static std::unique_ptr<SubtitlesProvider> get_subs_provider(wxEvtHandler *evt_handler, agi::BackgroundRunner *br) {
 	try {
-		return SubtitlesProviderFactory::GetProvider();
+		return SubtitlesProviderFactory::GetProvider(br);
 	}
 	catch (std::string const& err) {
-		parent->AddPendingEvent(SubtitlesProviderErrorEvent(err));
+		evt_handler->AddPendingEvent(SubtitlesProviderErrorEvent(err));
 		return nullptr;
 	}
 }
 
-ThreadedFrameSource::ThreadedFrameSource(agi::fs::path const& video_filename, std::string const& colormatrix, wxEvtHandler *parent)
+ThreadedFrameSource::ThreadedFrameSource(agi::fs::path const& video_filename, std::string const& colormatrix, wxEvtHandler *parent, agi::BackgroundRunner *br)
 : worker(agi::dispatch::Create())
-, subs_provider(get_subs_provider(parent))
-, video_provider(VideoProviderFactory::GetProvider(video_filename, colormatrix))
+, subs_provider(get_subs_provider(parent, br))
+, video_provider(VideoProviderFactory::GetProvider(video_filename, colormatrix, br))
 , parent(parent)
 {
 }
diff --git a/src/threaded_frame_source.h b/src/threaded_frame_source.h
index f7f366833..d8a4c813f 100644
--- a/src/threaded_frame_source.h
+++ b/src/threaded_frame_source.h
@@ -35,7 +35,10 @@ class SubtitlesProvider;
 class VideoProvider;
 class VideoProviderError;
 struct VideoFrame;
-namespace agi { namespace dispatch { class Queue; } }
+namespace agi {
+	class BackgroundRunner;
+	namespace dispatch { class Queue; }
+}
 
 /// @class ThreadedFrameSource
 /// @brief An asynchronous video decoding and subtitle rendering wrapper
@@ -106,7 +109,7 @@ public:
 	/// @brief Constructor
 	/// @param videoFileName File to open
 	/// @param parent Event handler to send FrameReady events to
-	ThreadedFrameSource(agi::fs::path const& filename, std::string const& colormatrix, wxEvtHandler *parent);
+	ThreadedFrameSource(agi::fs::path const& filename, std::string const& colormatrix, wxEvtHandler *parent, agi::BackgroundRunner *br);
 	~ThreadedFrameSource();
 };
 
diff --git a/src/utils.cpp b/src/utils.cpp
index 2936ea9bf..b7efb64a8 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -97,10 +97,6 @@ std::string float_to_string(double val) {
 	return s;
 }
 
-void StatusTimeout(wxString const& msg, int ms) {
-	wxGetApp().frame->StatusTimeout(msg, ms);
-}
-
 int SmallestPowerOf2(int x) {
 	x--;
 	x |= (x >> 1);
diff --git a/src/utils.h b/src/utils.h
index 2cbfb555f..9fe35e8a9 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -55,8 +55,6 @@ wxString PrettySize(int bytes);
 
 std::string float_to_string(double val);
 
-void StatusTimeout(wxString const& msg, int ms = 10000);
-
 /// @brief Get the smallest power of two that is greater or equal to x
 ///
 /// Algorithm from http://bob.allegronetwork.com/prog/tricks.html
diff --git a/src/video_context.cpp b/src/video_context.cpp
index 31da0be64..2a17c9396 100644
--- a/src/video_context.cpp
+++ b/src/video_context.cpp
@@ -41,6 +41,7 @@
 #include "ass_time.h"
 #include "audio_controller.h"
 #include "compat.h"
+#include "dialog_progress.h"
 #include "include/aegisub/context.h"
 #include "include/aegisub/video_provider.h"
 #include "mkv_wrap.h"
@@ -122,8 +123,9 @@ void VideoContext::SetVideo(const agi::fs::path &filename) {
 
 	bool commit_subs = false;
 	try {
+		DialogProgress progress(context->parent);
 		auto old_matrix = context->ass->GetScriptInfo("YCbCr Matrix");
-		provider.reset(new ThreadedFrameSource(filename, old_matrix, this));
+		provider.reset(new ThreadedFrameSource(filename, old_matrix, this, &progress));
 		video_provider = provider->GetVideoProvider();
 		video_filename = filename;
 
diff --git a/src/video_provider_avs.cpp b/src/video_provider_avs.cpp
index e9bd50ce5..e992805c4 100644
--- a/src/video_provider_avs.cpp
+++ b/src/video_provider_avs.cpp
@@ -310,7 +310,8 @@ std::shared_ptr<VideoFrame> AvisynthVideoProvider::GetFrame(int n) {
 }
 }
 
-std::unique_ptr<VideoProvider> CreateAvisynthVideoProvider(agi::fs::path const& path, std::string const& colormatrix) {
+namespace agi { class BackgroundRunner; }
+std::unique_ptr<VideoProvider> CreateAvisynthVideoProvider(agi::fs::path const& path, std::string const& colormatrix, agi::BackgroundRunner *) {
 	return agi::util::make_unique<AvisynthVideoProvider>(path, colormatrix);
 }
 #endif // HAVE_AVISYNTH
diff --git a/src/video_provider_dummy.cpp b/src/video_provider_dummy.cpp
index 3c70357ae..9bb18a0e0 100644
--- a/src/video_provider_dummy.cpp
+++ b/src/video_provider_dummy.cpp
@@ -97,7 +97,8 @@ std::shared_ptr<VideoFrame> DummyVideoProvider::GetFrame(int) {
 	return std::make_shared<VideoFrame>(data.data(), width, height, width * 4, false);
 }
 
-std::unique_ptr<VideoProvider> CreateDummyVideoProvider(agi::fs::path const& filename, std::string const&) {
+namespace agi { class BackgroundRunner; }
+std::unique_ptr<VideoProvider> CreateDummyVideoProvider(agi::fs::path const& filename, std::string const&, agi::BackgroundRunner *) {
 	if (!boost::starts_with(filename.string(), "?dummy"))
 		return {};
 
@@ -123,4 +124,4 @@ std::unique_ptr<VideoProvider> CreateDummyVideoProvider(agi::fs::path const& fil
 	bool pattern = toks[i] == "c";
 
 	return agi::util::make_unique<DummyVideoProvider>(fps, frames, width, height, agi::Color(red, green, blue), pattern);
-}
\ No newline at end of file
+}
diff --git a/src/video_provider_ffmpegsource.cpp b/src/video_provider_ffmpegsource.cpp
index 7a43ee348..794714218 100644
--- a/src/video_provider_ffmpegsource.cpp
+++ b/src/video_provider_ffmpegsource.cpp
@@ -71,7 +71,7 @@ class FFmpegSourceVideoProvider final : public VideoProvider, FFmpegSourceProvid
 	void LoadVideo(agi::fs::path const& filename, std::string const& colormatrix);
 
 public:
-	FFmpegSourceVideoProvider(agi::fs::path const& filename, std::string const& colormatrix);
+	FFmpegSourceVideoProvider(agi::fs::path const& filename, std::string const& colormatrix, agi::BackgroundRunner *br);
 
 	std::shared_ptr<VideoFrame> GetFrame(int n) override;
 
@@ -108,8 +108,9 @@ std::string colormatrix_description(int cs, int cr) {
 	}
 }
 
-FFmpegSourceVideoProvider::FFmpegSourceVideoProvider(agi::fs::path const& filename, std::string const& colormatrix) try
-: VideoSource(nullptr, FFMS_DestroyVideoSource)
+FFmpegSourceVideoProvider::FFmpegSourceVideoProvider(agi::fs::path const& filename, std::string const& colormatrix, agi::BackgroundRunner *br) try
+: FFmpegSourceProvider(br)
+, VideoSource(nullptr, FFMS_DestroyVideoSource)
 {
 	ErrInfo.Buffer		= FFMSErrMsg;
 	ErrInfo.BufferSize	= sizeof(FFMSErrMsg);
@@ -285,8 +286,8 @@ std::shared_ptr<VideoFrame> FFmpegSourceVideoProvider::GetFrame(int n) {
 }
 }
 
-std::unique_ptr<VideoProvider> CreateFFmpegSourceVideoProvider(agi::fs::path const& path, std::string const& colormatrix) {
-	return agi::util::make_unique<FFmpegSourceVideoProvider>(path, colormatrix);
+std::unique_ptr<VideoProvider> CreateFFmpegSourceVideoProvider(agi::fs::path const& path, std::string const& colormatrix, agi::BackgroundRunner *br) {
+	return agi::util::make_unique<FFmpegSourceVideoProvider>(path, colormatrix, br);
 }
 
 #endif /* WITH_FFMS2 */
diff --git a/src/video_provider_manager.cpp b/src/video_provider_manager.cpp
index 73550b50f..468d66b6c 100644
--- a/src/video_provider_manager.cpp
+++ b/src/video_provider_manager.cpp
@@ -28,17 +28,17 @@
 
 #include <boost/range/iterator_range.hpp>
 
-std::unique_ptr<VideoProvider> CreateDummyVideoProvider(agi::fs::path const&, std::string const&);
-std::unique_ptr<VideoProvider> CreateYUV4MPEGVideoProvider(agi::fs::path const&, std::string const&);
-std::unique_ptr<VideoProvider> CreateFFmpegSourceVideoProvider(agi::fs::path const&, std::string const&);
-std::unique_ptr<VideoProvider> CreateAvisynthVideoProvider(agi::fs::path const&, std::string const&);
+std::unique_ptr<VideoProvider> CreateDummyVideoProvider(agi::fs::path const&, std::string const&, agi::BackgroundRunner *);
+std::unique_ptr<VideoProvider> CreateYUV4MPEGVideoProvider(agi::fs::path const&, std::string const&, agi::BackgroundRunner *);
+std::unique_ptr<VideoProvider> CreateFFmpegSourceVideoProvider(agi::fs::path const&, std::string const&, agi::BackgroundRunner *);
+std::unique_ptr<VideoProvider> CreateAvisynthVideoProvider(agi::fs::path const&, std::string const&, agi::BackgroundRunner *);
 
 std::unique_ptr<VideoProvider> CreateCacheVideoProvider(std::unique_ptr<VideoProvider>);
 
 namespace {
 	struct factory {
 		const char *name;
-		std::unique_ptr<VideoProvider> (*create)(agi::fs::path const&, std::string const&);
+		std::unique_ptr<VideoProvider> (*create)(agi::fs::path const&, std::string const&, agi::BackgroundRunner *);
 		bool hidden;
 	};
 
@@ -58,7 +58,7 @@ std::vector<std::string> VideoProviderFactory::GetClasses() {
 	return ::GetClasses(boost::make_iterator_range(std::begin(providers), std::end(providers)));
 }
 
-std::unique_ptr<VideoProvider> VideoProviderFactory::GetProvider(agi::fs::path const& filename, std::string const& colormatrix) {
+std::unique_ptr<VideoProvider> VideoProviderFactory::GetProvider(agi::fs::path const& filename, std::string const& colormatrix, agi::BackgroundRunner *br) {
 	auto preferred = OPT_GET("Video/Provider")->GetString();
 	auto sorted = GetSorted(boost::make_iterator_range(std::begin(providers), std::end(providers)), preferred);
 
@@ -70,7 +70,7 @@ std::unique_ptr<VideoProvider> VideoProviderFactory::GetProvider(agi::fs::path c
 	for (auto factory : sorted) {
 		std::string err;
 		try {
-			auto provider = factory->create(filename, colormatrix);
+			auto provider = factory->create(filename, colormatrix, br);
 			if (!provider) continue;
 			LOG_I("manager/video/provider") << factory->name << ": opened " << filename;
 			return provider->WantsCaching() ? CreateCacheVideoProvider(std::move(provider)) : std::move(provider);
diff --git a/src/video_provider_manager.h b/src/video_provider_manager.h
index 718401e73..0e4ddfcb3 100644
--- a/src/video_provider_manager.h
+++ b/src/video_provider_manager.h
@@ -21,8 +21,9 @@
 #include <vector>
 
 class VideoProvider;
+namespace agi { class BackgroundRunner; }
 
 struct VideoProviderFactory {
 	static std::vector<std::string> GetClasses();
-	static std::unique_ptr<VideoProvider> GetProvider(agi::fs::path const& video_file, std::string const& colormatrix);
+	static std::unique_ptr<VideoProvider> GetProvider(agi::fs::path const& video_file, std::string const& colormatrix, agi::BackgroundRunner *br);
 };
diff --git a/src/video_provider_yuv4mpeg.cpp b/src/video_provider_yuv4mpeg.cpp
index 3bed2812e..08bd0626b 100644
--- a/src/video_provider_yuv4mpeg.cpp
+++ b/src/video_provider_yuv4mpeg.cpp
@@ -448,6 +448,7 @@ std::shared_ptr<VideoFrame> YUV4MPEGVideoProvider::GetFrame(int n) {
 }
 }
 
-std::unique_ptr<VideoProvider> CreateYUV4MPEGVideoProvider(agi::fs::path const& path, std::string const&) {
+namespace agi { class BackgroundRunner; }
+std::unique_ptr<VideoProvider> CreateYUV4MPEGVideoProvider(agi::fs::path const& path, std::string const&, agi::BackgroundRunner *) {
 	return agi::util::make_unique<YUV4MPEGVideoProvider>(path);
 }