** 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!
*******************************************************************************
…
Assertion v>0 && v<=(1 ? 32 : 16) failed at libavutil/mem.c:226

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

И так каждый раз, когда хочешь по-быстрому поковыряться с перекодированием. Тыщи параметров — и большинство бесполезны, потому что друг с другом не работают.