RTP stream: change the payload type

[Elio Francesconi]

Hi Sebastian,
I’ll open a file bug, but before opening it I noticed that in the source code, in gstrtpvp8pay.c:39,
the default PICTURE_ID_MODE is 7BITS
#define DEFAULT_PICTURE_ID_MODE VP8_PAY_PICTURE_ID_7BITS
Unfortunatelly this configuration is optional, so that’s why It is not compatible with linphone.

I noticed also that in gstrtpvp8pay.c can handle VP8_PAY_NO_PICTURE_ID option flag that linphone expects.

Assuming that, recompiling this new header is accepted by the endpoint, should I change also the encoder option to handle this new configuration?

Do you think that this could solve my issue?

Thanks a lot
Elio

On 03 Nov 2013, at 10:50, Sebastian Dröge <sebastian at centricular.com> wrote:

> On So, 2013-11-03 at 08:07 +0100, Elio Francesconi wrote:
>> Hi Sebastian,
>> digging with the issue I see a compatibility issue with the soft phone I’m using(Linphphone), it seems its vp8 decoder with name "WebM Project VP8 Decoder v0.9.7-pl” is not compatible with your encoder (I got gstreamer-1.2.pkg, you provide us)
>> 
>> And the only information I got was:
>> vpx_codec_decode failed : 5 Bitstream not supported by this decoder ((null))
>> 
>> People develop webrtc2sip server were having the same issue, I’ve found some threads about this issue
>> https://groups.google.com/forum/#!msg/discuss-webrtc/xCxqzxopsDM/jIKtkA_StOgJ
>> https://groups.google.com/forum/#!topic/doubango/OH-nOn5w-ng
>> They solved disabling extension in vp8 encoding #define TDAV_VP8_DISABLE_EXTENSION in
>> http://doubango.googlecode.com/svn-history/r796/branches/2.0/doubango/tinyDAV/src/codecs/vpx/tdav_codec_vp8.c 
>> 
>> 
>> This is the header of the first packet I sent to the softphone
>> 90:80:7c:10:32:00:9d:01:2a:a0:00:78:00:00:47:08:85:85:88:85:84:88…
>> 
>> If I’ve understood correctly these discussion, the header 90:80 is not compliant with WebM Vp8 decoder used linphone, because it cannot interpret such header.
>> 
>> What do you think? Have you experience on these compatibility issues?
> 
> I have not experienced that before, no. This sounds like a problem with
> the RTP payloading, not with the VP8 codec itself.
> 
> Could you file a bug about this at http://bugzilla.gnome.org ?
> 
> Someone should check if we correctly handle the very latest VP8 RTP
> spec, or if there were any changes since last time. Alternatively it
> could also be that linphone only supports an older version of the VP8
> RTP spec.
> 
> -- 
> Sebastian Dröge <sebastian at centricular.com>
> Centricular Ltd - http://www.centricular.com
> Expertise, Straight from the Source
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