Preroll

Preroll will seek video frames and/or audio seconds before the target point on any non-linear access.

This may help avoid decoding problems with source filters that do not handle random access correctly.

“Preroll works by detecting any out of order access in the audio or video track, and seeking the specified amount earlier in the stream and then taking a contiguous run up to the desired frame or audio sample. Skipping forward less than the preroll values results in linear access behaviour, i.e. all the intervening samples are accessed and discarded.” [IanB]

Also see this Doom9 thread.

Syntax and Parameters

Preroll (clip, int "video", float "audio")

clip

Source clip; all color formats supported.

video

Frames to preroll.

Default: 0

audio

Audio to preroll, in seconds.

Default: 0.0

Examples

25 frame video preroll, 10.0 seconds audio preroll:

xxxSource("video.mp4")
Preroll(video=25, audio=10.0)

Changelog

Version	Changes
AviSynth 2.6.0	Initial release

$Date: 2022/04/17 13:38:34 $