[Libav-user] Determining video container format of streamed file after url_open

[Jean-Yves Avenard]

Hi there.

I would like to get help on the best way to determine what the
container format is of a streamed media accessed via ffmpeg; right
after calling url_open and before starting to use url_read

What I'm trying to determine is if a file being accessed over http is
either mp4 or m4v format.

I was wondering if such a function existed...

Thank you in advance
Regards
Jean-Yves