How to send a RTCP FIR?

[Olivier Crête]

Hi,

First, you probably want to use RFC 4585 NACK PLI instead of RFC 5104
FIR (or RFC 2032 FIR, those are only defined for H.261) for this
use-case.

To do that with GStreamer:
1. add a field named "rtcp-fb-nack-pli" to your rtp caps, so if you send
H264 with PT 96, you'd have something like:
application/x-rtp, payload=(int)96, encoding-name=(string)H264,
clock-rate=(int)90000, rtcp-fb-nack-pli=(int)1

2. Make sure that your decoder sends an upstream GstForceKeyUnit event
when it detects an image loss (note: gst-libav still doesn't do that).

Olivier


On Mon, 2013-06-24 at 08:30 -0700, Sergio López wrote:
> Hi,
> 
> I have a pipeline which receives rtp encoded in vp8. Many times, the vp8dec
> element  shows the message "No keyframe, skipping" until a new keyframe is
> sent by the other side. I read that with a RTCP FIR you can force to the
> remote to send you a new keyframe when it receives this packet.
> 
> The problem is that I don't know how to send this kind of packets to the
> other endpoint. Must I do something special in this element (vp8dec)?
> 
> The gstreamer's version I'm using is 0.10.36.
> 
> Thanks for your time.
> 
> Regards,
> Sergio
> 
> 
> 
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-- 
Olivier Crête
olivier.crete at collabora.com