[Libav-user] Cached frames

[Gonzalo Garramuno]

I understand that some video (and audio) codecs cache frames to decode B 
frames for example.  In order to retrieve the last frames of such 
movies, it is needed to call av_read_frame and wait for an error of 
AVERROR_EOF which then means I need to pass packets with NULL and size 0.
This is all dandy.  However, I would like to know in advance how many 
times I will need to pass packets with NULL and size 0.  Is there a way 
to know this?

-- 
Gonzalo Garramuño