Re: [Linphone-developers] Incoming video garbled (H264, MP4V-ES), no video with VP8

[Jeremy Jongepier]

On 03/13/2013 11:23 AM, Ghislain Mary wrote:
> Hi Jeremy,
>
> I looked at the logs and the network traces you provided. There are indeed
> decoding errors. However these errors are not in Linphone but in ffmpeg
> that Linphone uses to decode H.264 streams.
> Searching for some of the decoding error messages (eg "out of range intra
> chroma pred mode" or "mb_type -6 in P slice too large at 4 7") brings a lot
> of results from people having the same kind of problem.
> For example,
> http://mailman.videolan.org/pipermail/x264-devel/2009-October/006410.htmlor
> https://ffmpeg.org/trac/ffmpeg/ticket/285.
> So I'm afraid there is not much we can do in Linphone to support this kind
> of streams. You may try to use the latest version of ffmpeg that may fix
> this issue. Or if you have access to it, you can try to change the
> configuration of the encoder of the H.264 stream, but you'll need to find
> the encoding option that is causing the issue.
>
> Cheers,
> Ghislain

Hello Ghislain,

Thanks! This narrows things down quite a big bit. Do you mean with 
trying to use the latest version of ffmpeg that we should try to compile 
linphone against a more recent version of ffmpeg? That's no problem. I 
can also check the configuration of the encoder (webrtc2sip), that 
application also uses ffmpeg by the way.

Regards,

Jeremy