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

[Jean-Yves Avenard]

On 6 May 2012 17:05, Alex Cohn <alexcohn at netvision.net.il> wrote:
> The difference between mp4 and m4v is often illusionary, see
> http://en.wikipedia.org/wiki/M4V and
> https://discussions.apple.com/thread/2309476?start=0&tstart=0 for some
> details. The big issue is DRM, which may render the mv4 file
> impossible to decode with ffmpeg. The AC3 (Dolby Digital) audio which
> may be embedded in m4v, but never mp4 - is less of a problem for your
> decoder.

I guess I didn't explain myself properly..

I want to distinguish mp4/m4vm from all others containers (be it AVI,
mkv, whatever)

It's not about distinguishing mp4 vs m4v...