REMEMBER: MEncoder's libavformat muxing is presently broken

[coroner]

Hello

Version 0.7.1.4433

When i try to cut out part of mp4 (avc1/acc) file with MEncoder i see ominous warning:

Code: Select all

** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************

What does this mean? Can I use MEncoder fearless? In internet I have not found the clear answer. MEncoder is the only solution to edit mp4 files, because ffmpeg have big problem with sync. Anyway Light Alloy player plays transcoded files normally. The file itself, too, seems perfectly normal. Is it only seems?

BR, Igor

[stanley]

If you don't use B-frames (e.g. using Xvid simple profile, H.264 baseline), it should be safe.