AVISYNTH AUDIO MP4
AVISYNTH AUDIO FULL

Since the mask works like it does, and FFMS2 is designed to run on a machine that uses two's complement integers, -1 (the default) means index all tracks and 0 means index none. if you want to index track 3, the mask is 2^(3-1) = 4). Since Avisynth doesn't have any bitwise operators at all, constructing a mask for more than one track inside an Avisynth script is a rather annoying task for a single track the mask is, naturally, 2 to the power of the track number minus 1 (i.e. In other words, the mask is a bit field where each bit is a track number (the least significant bit is track number 0).

AVISYNTH AUDIO 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. int indexmask = -1ДЄ 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).Дefaults 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 FFIndexДЇFIndex(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(),Д«ut if you want to you can invoke the indexing yourself by calling FFIndex(), or by running ffmsindex.exe.Д«y 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 YouД«efore FFMS2 can open a file, it must be indexed first so that keyframe/sample positions are known and seeking is easily accomplished.

AVISYNTH AUDIO MP4

Seeking should be sample-accurate with most codecs in AVI, MKV, MP4 and FLV.Дecoding 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.

Avisynth audio