Preroll

Preroll(clip clip, int video, float audio)

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.

todo: http://forum.doom9.org/showthread.php?p=1565770#post1565770 and http://forum.doom9.org/showthread.php?t=167890&highlight=preroll

Changes:

v2.60

Initial release