2013/9/3 Luca Barbato <[email protected]>:
>
> When does it happen?
>

When end of file.

avcodec_decode_video2() in avcodec.h
@note Codecs which have the CODEC_CAP_DELAY capability set have a
delay between input and output, these need to be fed with
avpkt->data=NULL, avpkt->size=0 at the end to return the remaining
frames.
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