[Libav-user] How to retrieve cover arts from mp4 or mkv files

[cyril apan]

Hi there,

Can anybody show me a sample on the best way to retrieve cover arts from mp4 or mkv files using libav?
I found out that the AVStream structure has a AVPacket attached_pic field, but also that the streams field of the AVFormatContext structure can contain a stream of type AVMEDIA_TYPE_ATTACHMENT.
I'm not sure to see what's the difference of use between both, but at the end I want to get a bitmap of the cover art or the pîcture in its original format and what is the format (if it's jpeg, gif, png or something else).

Thanks for the help.

Cyril.
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