Decoding linearly will almost always give correct results, and forward-seeks from trimming should result in at most a few hundred samples of corruption. Only useful for testing and containers where libavformat doesn't report keyframes properly. The color range the input video claims to be using. The syntax is the same for both. Bases seeking decisions on the keyframe positions reported by libavformat. 
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FFmpegSource From Avisynth wiki.
To work around it open the audio first: Doom9 Forum - FFmpegSource discussion. Views Page Discussion View source History.
If cfms2 is greater than zero, this filter will force a constant frame rate, expressed as a rational number where fpsnum is the numerator and fpsden is the denominator.
These parameters are mostly useful because FFMS2 supports video streams that change resolution mid-stream; since Avisynth does not, these parameters are used to set single resolution for the output. Apart from the time consumed this is harmless.
Note, FFMS2 is a shorter name added in v2. No adjustment is made; the first decodable audio sample becomes the first sample in the output. If fpsnum is less than or equal to zero the defaultthe output will contain the same frames that the input did, and the frame rate reported to Avisynth will be set based on the input clip's average frame duration. Bases seeking decisions on the keyframe positions reported by libavformat. Notepad will write a BOM, so use ffsm2 else.
You should also note that setting this parameter incorrectly will cause all file openings to fail unless your filenames are exclusively 7-bit ASCII compatible. The variable prefix of the last called FFMS source function. If set to false, this filter will not look for an existing index file; instead all video tracks will be indexed when the script is opened, and the indexing data will be discarded after the script is closed; you will have to index again next time you open the script.
FFmpegSource - Avisynth wiki
The color range the input video claims to be using. This makes it possible to open files with odd filenames ffjs2 otherwise would not be openable. Update to FFmpeg 4. Note that this setting might be completely ignored under a number of conditions; most commonly because a lot of decoders actually do not support multithreading.
Samples are created with silence or discarded so that sample 0 in the decoded audio starts at time zero. Only intended for opening images but might work on well with some obscure video format.
Same as mode 1, but no error will be thrown if the exact seek destination has to be guessed. The precompiled binary is GPL3 licensed.
If ffmss2 wonder why FFMS2 takes so long opening files, the indexing is the answer. NOTE this section does not appear in the latest documentation and may be obsolete.
ffms2 package in Ubuntu
If no index is found, all video tracks will be indexed, and the indexing data will be written to cachefile afterwards. You must make sure you save the.
Only meaningful for YUV inputs.
Seeks in the forward direction even if no closer keyframe is known to exist. GitHub - Source code repository. Note that this is a global variable. Setting this to an empty string the default means keeping the same colorspace as the input. The picture type of the most recently requested frame as the ASCII number of the character listed below.
This may naturally cause dropped or duplicated frames to achieve the desired frame rate, and the output is not guaranteed to have the same number of frames that the input did. Switch to libdav1d for AV1 decoding.
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