H264 RTP

[Chuck Crisler]

I am confused by something in here. Data moves through a pipeline by 
elements allocating buffers and pushing them through pads. If you have a 
plugin element that works with a piece of hardware (say an H264 encoder), it 
will generate buffers that it knows about. But the next element (the 
rtph264pay element) receives a gstbasertppayload buffer directly in the 
handle buffer function. Who allocates that input buffer and initializes the 
fields?

Thank you.
----- Original Message ----- 
From: "Chuck Crisler" <ccrisler at vgocom.com>
To: "Discussion of the development of and with GStreamer" 
<gstreamer-devel at lists.freedesktop.org>
Sent: Thursday, April 14, 2011 6:57 PM
Subject: Re: H264 RTP


OK, the RTP header values are set in the call to gst_basertppayload_push()
to push the buffer to the next element. The function uses the passed in
GstBaseRTPPayload * object. That object might be part of the derived object
that implements a GstStaticPadTemplate with some data. However, things like
the RTP version aren't set there.

Chuck
----- Original Message ----- 
From: "Chuck Crisler" <ccrisler at vgocom.com>
To: "Discussion of the development of and with GStreamer"
<gstreamer-devel at lists.freedesktop.org>
Sent: Thursday, April 14, 2011 6:40 PM
Subject: Re: H264 RTP


It is an embedded system and we don't quite have that freedom. :-(

----- Original Message ----- 
From: "Tim-Philipp Müller" <t.i.m at zen.co.uk>
To: <gstreamer-devel at lists.freedesktop.org>
Sent: Thursday, April 14, 2011 6:37 PM
Subject: Re: H264 RTP


> On Thu, 2011-04-14 at 18:21 -0400, Chuck Crisler wrote:
>
>> I am working with plugin code that is supposed to be transmitting H264 
>> video
>> via RTP. It uses the element rtph264pay. This code works in an earlier
>> version but fails in my 'new and improved' version. I have upgraded to
>> gstreamer 0.10.22 (not sure about the earlier version), good plugin 
>> 0.10.14
>> from 0.10.10 and base 0.10.22 from 0.10.21. A packet sniff shows that the
>> RTP is simply all wrong, even the RTP version, which is the first RTP 
>> byte.
>> Is there something that I should be doing to get the RTP header properly
>> generated, or should that 'just happen'?
>
> Just to double-check: you're having a problem with rtph264pay which you
> upgraded from an almost 3-year old version to a more than 2-year old
> version?
>
> Have you tried something slightly more recent, like the latest releases
> for example?
>
> Cheers
> -Tim
>
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