Aviad Rozenhek wrote:
> 
> what about B frames, and even better, knowing if a B frame is a reference
> frame or not?
> 

I derive such information from the analysis of AVPacket.data. 
Just scan for sequences of 0x00 0x00 0x01 and analyze bits following them.
Here is the quick reference of MPEG2 headers:
http://dvd.sourceforge.net/dvdinfo/mpeghdrs.html

And what is "B frame is a reference frame"?

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