Ffms2 avisynth
![ffms2 avisynth ffms2 avisynth](http://1.bp.blogspot.com/-ni-KYgUMYpI/UL604_3Vr8I/AAAAAAAAAHk/-4L9Fd2ARPg/s1600/ffcoder3.png)
Ffms2 avisynth full#
The mask is constructed by bitshifting 1 left by the track number if multiple tracks are desired, bitwise OR each value so created together to get the full mask.
![ffms2 avisynth ffms2 avisynth](https://discuss.haiku-os.org/uploads/default/original/2X/9/9a4ce7dc6a0ded9a146c3c746eb372be4dfbb674.png)
int indexmask = -1Ī binary mask representing what audio tracks should be indexed (all video tracks are always indexed you have no choice in the matter). The filename of the index file (where the indexing data is saved).ĭefaults to sourcefilename.ffindex. The return value isn't particularly interesting, but for the record it's 0 if the index file already exists (and is valid) and overwrite was not enabled, 1 if the index file was created and no previous index existed, and 2 if the index file was created by overwriting an existing, valid index file. Note that this function returns an integer, not a clip (since it doesn't open video, nor audio). It does, however, give you more control over how indexing is done. Normally you do not need to call this function manually it's invoked automatically if necessary by FFVideoSource/ FFAudioSource. Indexes a number of tracks in a given source file and writes the index file to disk, where it can be picked up and used by FFVideoSource or FFAudioSource. Int errorhandling = 3, bool overwrite = false, bool enable_drefs = false, bool use_absolute_path = false) Function reference FFIndexįFIndex(string source, string cachefile = source + ".ffindex", int indexmask = -1, If you want a progress report on the indexing, you can use the supplied ffmsindex.exe commandline program. If you wonder why FFMS2 takes so long opening files, the indexing is the answer. This is done automatically when using FFVideoSource() or FFAudioSource(),īut if you want to you can invoke the indexing yourself by calling FFIndex(), or by running ffmsindex.exe.īy default the index is written to a file so it can be reused the next time you open the same file, but this behavior can be turned off if desired. Indexing and Youīefore FFMS2 can open a file, it must be indexed first so that keyframe/sample positions are known and seeking is easily accomplished.
Ffms2 avisynth mp4#
Seeking should be sample-accurate with most codecs in AVI, MKV, MP4 and FLV.ĭecoding linearly will almost always give correct results, and forward-seeks from trimming should result in at most a few hundred samples of corruption. Image files: Most formats can be opened if seekmode=-1 is set, no animation support.M2TS, TS: Seeking seems to be off a few frames here and there.VOB, MPG: Seeking seems to be off by one or two frames now and then.WMV: Frame accurate(?) but avformat seems to pick keyframes relatively far away.Open-GOP H.264 will sometimes produces corruption when seeking.Transport Streams will not decode reliably without seekmode -1.Interlaced H.264 mostly works these days, but seeking may occasionally result in corruption.Test3 6 - Fixes the channel mask variable that was previously almost always wrong in AviSynth.AudioDub(FFVideoSource(X), FFAudioSource(X))
Ffms2 avisynth update#
Test4 9 - Update for latest audio api revision Test5 3 - Properly export the number of bits per sample Test6 3 - Fixes clips with more than 2^31 samples in VS and adds 24 bit output to AviSynth. Test7 2 - VapourSynth: update for V4 api again fixed all known bugs and should be fairly stable Test8 7 - Updated with several new options, including drc_scale. Everything except automatic delay adjustment implemented. Soft sounds are enhanced.Įxamples BestAudioSource("blah.mp4", track=-1, adjustdelay=-1, exactsamples=false, enable_drefs=false, use_absolute_path=false, drc_scale=0) There are 3 notable scale factor ranges:ĭRC enabled.
![ffms2 avisynth ffms2 avisynth](https://i.imgur.com/bbUSOI5.png)
The factor to apply to dynamic range values from the AC-3 stream. Set to true if you want opening files to be really slow but for some reason need a completely sample exact length.Įnable loading of external tracks, disabled by default.Īllows loading of external tracks via absolute paths, disabled by default.ĭynamic Range Scale Factor. Negative numbers refer to the nth audio track with -1 being the first. Positive track numbers refer to the FFmpeg given stream number. Path can be omitted if the script is in the same folder as the audio file. Syntax and Parameters BestAudioSource (string "source", int "track", int "adjustdelay", bool "exactsamples", bool "enable_drefs", bool "use_absolute_path", float "drc_scale", string "varprefix") A new sample accurate but somewhat slow FFmpeg based audio source filter for AviSynth.