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FFmpegSource Documentation
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< h1 > FFmpegSource Documentation< / h1 >
< h2 > Changes< / h2 >
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< li > 1.3< ul >
< li > Compiled against ffmpeg rev9620< / li >
< li > Added FFAudioRefSource< / li >
< li > Added FFAudioSource (has big issues)< / li >
< li > Renamed FFmpegSource to FFVideoSource< / li >
< li > Adjusted seeking in the forward direction to only be done if the requested frame is more than 10 frames away to reduce unnecessary seeking< / li >
< li > Now outputs the last frame properly when there are decoding delays< / li >
< / ul > < / li >
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< li > 1.2< ul >
< li > Compiled against ffmpeg rev9451< / li >
< li > Somewhat cleaner source code< / li >
< li > Linear access in addition to a few other modes of seeking can now be forced< / li >
< li > Can now save the index information to a file which makes subsequent file opening fast< / li >
< li > No longer skips indexing for any format< / li >
< / ul > < / li >
< li > 1.1< ul >
< li > Skip indexing for avi< / li >
< li > Prefix all error messages with the plugin name< / li >
< li > Can write v2 timecodes to a file< / li >
< li > Fixed reported framerate< / li >
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< h2 > Usage< / h2 >
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< b > FFVideoSource(string source, int track = -1, int seekmode = 1, string timecodes, bool cache = true, string cachefile)< / b > < br / >
A video source that is frame accurate for most popular containers
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< b > FFAudioSource(string source, int track = -1)< / b > < br / >
Very unreliable attempt at sample accurate seeking in audio files
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< b > FFAudioRefSource(string source, int track = -1, string cachefile)< / b > < br / >
Decodes all audio to a temporary file which ensures that it will always be sample accurate
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< b > source:< / b >
source file
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< p >
< b > track:< / b >
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track number as seen by the relevant demuxer, starts from 0, -1 means it will pick the first suitable track
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< b > seekmode:< / b >
force how seeking is handled, has no effect on matroska files which always use the equivalent of seekmode=1< br / >
< b > 0:< / b > linear access, the definition of slow but should make some formats "usable"< br / >
< b > 1:< / b > safe normal, bases seeking decisions on the reported keyframe positions< br / >
< b > 2:< / b > unsafe normal, same as 1 but no error will be thrown if the exact destination has to be guessed< br / >
< b > 3:< / b > aggressive, seek in the forward direction even if no closer keyframe is known to exist, only useful for containers where avformat doesn't report keyframes properly and testing
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< b > timecodes:< / b >
file to output timecodes to, if the file exists it will always be overwritten
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< b > cache:< / b >
write indexing information to a file for later use
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< p >
< b > cachefile:< / b >
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if specified the file to store the index information or raw audio in, if nothing is specified (source).ffcache is used for video and (source).ffracache for audio
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< h2 > Compatibility - Video< / h2 >
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< li > AVI, MKV, MP4, FLV: Frame accurate< / li >
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< li > WMV: Frame accurate(?) but avformat seems to pick keyframes relatively far away< / li >
< li > OGM: Messed up first frame and seeking produces smearing with seekmode=3, incredibly slow seeking without, remux to mkv or avi< / li >
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< li > VOB: No rff flags applied, frame accurate?< / li >
< li > MPG: Seeking seems to be off by one or two frames now and then< / li >
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< li > TS: don't bother< / li >
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< h2 > Compatibility - Audio< / h2 >
< ul >
< li > Not sample accurate ever?< / li >
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< / ul >
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< h2 > Compiling< / h2 >
< p > < b > zlib< / b > from http://www.zlib.net/< / p >
< p > < b > FFmpeg svn< / b > from http://ffmpeg.mplayerhq.hu/< / p >
< p > < b > Required Configuration:< / b >
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./configure --enable-shared --disable-static --enable-memalign-hack --enable-gpl --enable-swscaler< / p >
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< p > < b > Suggested Additional Options:< / b >
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--disable-encoders --disable-muxers --enable-small< / p >
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