I just received this on the mencoder list:

> Diego recently committed some changes removing
> i_certify_that_my_video_stream_does_not_use_b_fram es (
> http://cia.vc/stats/author/diego/.message/248bd). My understanding is that
> bframes are now supported when using lavf.
> Not sure about number 2, but have you tried removing/changing some of the
> command line options and seeing if you can narrow down the problem. I would
> take a look at -ofps and -srate to start, but I'm no expert.


Didn't really help my problem, because as I noted, removing the option only creates a high-speed video. But I thought I'd post it as a heads-up to you.