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Thread: (pay|depay)
(pay|depay)
user name
 2007-01-16 08:52:41 
Hi,

There is a small bug in rtph263pay, rtph263ppay and
rtph263pdepay (and
possibly other RTP elements). In those elements, the RTP
clock-rate is
only initialised when one sets the sink pad caps (this can
be seen in
gst_basertppayload_setcaps and
gst_base_rtp_depayload_setcaps).

This means that when one doesn't explicitly set the sink pad
caps, the
pipeline refuses to play and an error is printed because the
internal
clock-rate value of the RTP element is 0.

Since the H263 clock-rate is, AFAIK, always 90000, it should
be the
default value at element initialisation.

I've experienced the bug with gst-plugins-good 0.10.4, but
looking at
the source it hasn't been fixed in 0.10.5.

Regards

Antoine.



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Re: (pay|depay)
user name
 2007-01-23 05:28:48 

  


  

    On Tue, 2007-01-16 at 15:52 +0100, Antoine Pitrou wrote:
> Hi,
> 
> There is a small bug in rtph263pay, rtph263ppay and rtph263pdepay (and
> possibly other RTP elements). In those elements, the RTP clock-rate is
> only initialised when one sets the sink pad caps (this can be seen in
> gst_basertppayload_setcaps and gst_base_rtp_depayload_setcaps).
> 
> This means that when one doesn't explicitly set the sink pad caps, the
> pipeline refuses to play and an error is printed because the internal
> clock-rate value of the RTP element is 0.
> 
> Since the H263 clock-rate is, AFAIK, always 90000, it should be the
> default value at element initialisation.
> 
> I've experienced the bug with gst-plugins-good 0.10.4, but looking at
> the source it hasn't been fixed in 0.10.5.


The real problem is that no caps negotiation is happening. A plugin is
free to refuse any buffers when they have no type information. If you
are using UDP to feed the payloaders, set the "caps" property on udpsrc
with the info from the SDP (or similar). See also:
http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/gst/rtp/README?revision=1.9&view=markup
in the "usage with UDP" section.

Wim
> 
> Regards
> 
> Antoine.
> 
> 
> 
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-- 
Wim Taymans fluendo.com>


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