diff --git a/dlls/evr/mixer.c b/dlls/evr/mixer.c
index 54da3a9ce1c..631cc796ea0 100644
--- a/dlls/evr/mixer.c
+++ b/dlls/evr/mixer.c
@@ -79,6 +79,8 @@ struct video_mixer
     IMFAttributes *attributes;
     IMFAttributes *internal_attributes;
     unsigned int mixing_flags;
+    LONGLONG lower_bound;
+    LONGLONG upper_bound;
     CRITICAL_SECTION cs;
 };
 
@@ -814,9 +816,18 @@ static HRESULT WINAPI video_mixer_transform_GetOutputStatus(IMFTransform *iface,
 
 static HRESULT WINAPI video_mixer_transform_SetOutputBounds(IMFTransform *iface, LONGLONG lower, LONGLONG upper)
 {
-    FIXME("%p, %s, %s.\n", iface, wine_dbgstr_longlong(lower), wine_dbgstr_longlong(upper));
+    struct video_mixer *mixer = impl_from_IMFTransform(iface);
 
-    return E_NOTIMPL;
+    TRACE("%p, %s, %s.\n", iface, wine_dbgstr_longlong(lower), wine_dbgstr_longlong(upper));
+
+    EnterCriticalSection(&mixer->cs);
+
+    mixer->lower_bound = lower;
+    mixer->upper_bound = upper;
+
+    LeaveCriticalSection(&mixer->cs);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI video_mixer_transform_ProcessEvent(IMFTransform *iface, DWORD id, IMFMediaEvent *event)
@@ -1879,6 +1890,8 @@ HRESULT evr_mixer_create(IUnknown *outer, void **out)
     object->outer_unk = outer ? outer : &object->IUnknown_inner;
     object->refcount = 1;
     object->input_count = 1;
+    object->lower_bound = MFT_OUTPUT_BOUND_LOWER_UNBOUNDED;
+    object->upper_bound = MFT_OUTPUT_BOUND_UPPER_UNBOUNDED;
     video_mixer_init_input(&object->inputs[0]);
     InitializeCriticalSection(&object->cs);
     if (FAILED(hr = MFCreateAttributes(&object->attributes, 0)))
diff --git a/dlls/evr/tests/evr.c b/dlls/evr/tests/evr.c
index 175c30e8188..13a07c42c5d 100644
--- a/dlls/evr/tests/evr.c
+++ b/dlls/evr/tests/evr.c
@@ -531,6 +531,9 @@ todo_wine
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
     IUnknown_Release(unk);
 
+    hr = IMFTransform_SetOutputBounds(transform, 100, 10);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+
     hr = IMFTransform_QueryInterface(transform, &IID_IMFVideoDeviceID, (void **)&deviceid);
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
 
diff --git a/include/basetsd.h b/include/basetsd.h
index c9f5c90e863..7087b592d1a 100644
--- a/include/basetsd.h
+++ b/include/basetsd.h
@@ -265,6 +265,8 @@ typedef ULONG_PTR SIZE_T, *PSIZE_T;
 
 typedef ULONG_PTR KAFFINITY, *PKAFFINITY;
 
+#define MINLONGLONG             ((LONGLONG)~MAXLONGLONG)
+
 /* Some Wine-specific definitions */
 
 /* Architecture dependent settings. */
diff --git a/include/mftransform.idl b/include/mftransform.idl
index 1b402a5cc77..3f4b5500204 100644
--- a/include/mftransform.idl
+++ b/include/mftransform.idl
@@ -18,6 +18,9 @@
 
 import "mfobjects.idl";
 
+cpp_quote("#define MFT_OUTPUT_BOUND_LOWER_UNBOUNDED MINLONGLONG")
+cpp_quote("#define MFT_OUTPUT_BOUND_UPPER_UNBOUNDED MAXLONGLONG")
+
 typedef [v1_enum] enum _MFT_MESSAGE_TYPE
 {
     MFT_MESSAGE_COMMAND_FLUSH                   = 0x00000000,