June 23, 2020

Documentation about the filters of AviSynth can be found on this site Main Page, and in. (FFmpegSource2 does this for you with a single function call) or use (NOTE this section does not appear in the latest documentation and may. this documentation text files (in HTML or Wiki format);; the header files ‘avisynth.h’ (for the use of the C++ API) and ‘avisynth_c.h’ (for the use of.

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Opens files using FFmpeg and nothing else. May be frame accurate on good days. The precompiled binary is GPL3 licensed. Apart from the time consumed this is harmless. To work around it open the audio first: NOTE this section does not guidee in the latest documentation and may be obsolete.

Guides – Avisynth wiki

Decoding linearly will almost always give correct results, and forward-seeks from trimming should result in at most a few hundred samples of corruption. By 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. If you wonder why FFMS2 takes so long opening files, the indexing is the answer.

If you want a progress report on the indexing, you can use the supplied ffmsindex. 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.

Invokes indexing of all tracks if no valid index file is found, or if the requested track isn’t present in the index. Will invoke indexing of all video tracks but no audio tracks if no valid index file is found.

A convenience alias for FFVideoSourcewith the options set optimally for using it as an image reader. Disables caching and seeking for maximum compatiblity. A helper function used to format a time given in milliseconds into a h: Used internally by FFInfo. A helper function similar to Avisynth’s internal Info function; shows general information about the current frame. The playback aspect ratio specified by the container.

The colorimetry the input claims to be using. Only meaningful for YUV inputs.


The source for this variable is a metadata flag that can arbitrarily be set or manipulated at will by incompetent users or buggy programs without changing the actual video content, so blindly trusting its correctness is not recommended.

The value is exported as a cryptic numerical constant that matches the values in the MPEG-2 specification.

The color range the input video claims to be using. The picture type of the most recently requested frame as the ASCII number of suer character aisynth below. Use Chr to convert it to an actual letter in AviSynth. The FFmpeg source definition of the characters:. The actual time of the source frame in milliseconds. Only set when no type of CFR conversion is being done rffmode and fpsnum left at their defaults.


The audio channel layout of the userr stream. The variable prefix of the last called FFMS source function. Note that this avixynth a global variable. The C plugin supports the additional planar colorspaces in AviSynth usfr.

C-plugins must be loaded using LoadCPlugin. FFmpegSource From Avisynth wiki. Abstract Author Myrsloiket al. Because of LAVF’s demuxer, avisybth raw streams such as elementary h and other mpeg video streams will fail to work properly. To get the correct behavior, you can try setting fpsnum and fpsden so that the framerate xvisynth halved may or may not work. This issue is caused by libavcodec. Track numbers start from zero, and are guaranteed to be continous i.

Note that this filter’s idea about what track has what number may be completely different from what some other application might think. If no index is found, all video tracks will be indexed, and the indexing data will be written to cachefile afterwards.

If set to false, this filter will not look for an existing index file; instead all video tracks will be indexed when the guidf 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. 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 avusynth clip’s average frame duration.

If fpsnum 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.

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.

Setting it to less than or equal to zero means it defaults to the number of logical CPUs as reported by Windows. Note that this setting might be completely ignored under a number of conditions; most commonly because jser lot of decoders actually do not support multithreading. If the file exists, it will be truncated and overwritten.

AviSynth+ – Avisynth wiki

Set to the empty string to disable timecodes writing this is the default. Mostly useful for uzer uncooperative files to work. Linear access without rewind; i. Only intended for opening qvisynth but might work on well with some obscure video format. The definition of slow, but should make some formats “usable”.

Safe normal the default. Bases seeking decisions on the keyframe positions reported by libavformat. Same as mode 1, but no error will be thrown if the exact seek destination has to be aavisynth. Seeks in the forward direction avisybth if no closer keyframe is known to exist. Only useful for testing and containers where libavformat doesn’t report keyframes properly. Mostly useful for trackmask changes and testing.


Setting either dimension to less than or equal to zero which is the default means the resolution of the first decoded video frame is used avisyth that dimension.

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.

If the video uses subsampled chroma but your chosen output colorspace does not, the chosen resizer will be used to upscale the chroma planes, even if you did not request an image rescaling. Setting this to an empty string the default means keeping the same colorspace as the input. Ignore all flags the default mode. Honor all pulldown flags. When using either of those modes, it will also make the output be assumed as CFR, disallow vertical scaling and disallow setting the output colorspace.

Other subtle behavior changes may also exist. The following arguments are valid: No adjustment is made; the first decodable audio sample becomes the first sample in the output. Samples are created with silence or discarded so that sample 0 in the decoded audio starts at time zero.

Samples are created with silence or discarded so that sample 0 in the decoded audio starts at the same time as gguide 0 of the first video track. This is the default, and probably what most people want. Same as usre, but adjust relative to the video track with the given track number instead. If the provided track number isn’t a guude track, an error is raised.

This makes it possible to open files with odd filenames that otherwise would not be openable. You must make sure you save the.

Notepad will write a BOM, so use something 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. This makes it possible to differentiate between variables from different clips. Note, FFMS2 is a shorter name added in v2. The syntax is the same for both. FFFormatTime A helper function used to format a time given in milliseconds into a h: FFInfo A helper function similar to Avisynth’s internal Info function; shows general information about the current frame.

Unknown or unspecified 5 and 6: Limited range usually 2: Doom9 Forum – FFmpegSource discussion. GitHub – Source code repository. Retrieved from ” http: External filters Plugins Source filters.

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