[gst-devel] [devel] streaming h264

[Wai-Ming Ho]

Hi,

normally, using the latest CVS source for rtph264pay (in
gst-plugins-good/gst/rtp) , you should be able to retrieve the
sprop-parameter-sets in the negotiated caps. However, VLC should be
robust enough to not require sprop-parameter-sets to display video from
an RTP source. I just verified that on my ubuntu feisty environment.

you should be able to use a simple SDP for the video stream like the
template below (replace the appropriate values in profile-level-id and
sprop-parameter-sets with the ones you see in the caps traces). If you
don't have the sprop-parameter-sets/profile-level-id, just leave them
out completely.

v=0
o=- 12345 1 IN IP4 0.0.0.0
s=foobar
c=IN IP4 192.168.0.125
m=video 4760 RTP/AVP 96
a=rtpmap:96 H264/90000
a=fmtp:96 profile-level-id=<see_caps>; sprop-parameter-sets=<see_caps>;
packetization-mode=1

of course, always verify that you do have video coming out of the
decoder by checking either with an xvimagesink or fakesink dump=1:

gst-launch -v -m filesrc location=/home/terry/jill.3gp ! qtdemux
name=demuxer \
demuxer.! queue ! ffdec_h263 ! queue ! xvimagesink

if you don't see anything coming out of your decoder, this could be the
reason.

HTH,
waiming

> 
> 
On Thu, 2008-01-24 at 15:02 +0800, Terry Leung wrote:
> Hi all,
> 
> I am writing a rtsp server to stream h264 rtp packet
> I use lve555 to write the rtsp part and gstreamer for streaming the rtp
> I use vlc to act as a rtsp client
> 
> The rtsp part is working well(by capturing the packet in between)
> but the video cannot be seen
> 
> Here is the pipeline i used: (jill.3gp is a video file encoded in h263)
> gst-launch --gst-debug-level=2 -v -m filesrc
> location=/home/terry/jill.3gp ! qtdemux name=demuxer \
> demuxer.! queue ! ffdec_h263 ! x264enc byte-stream=true !  rtph264pay
> ! udpsink host=192.168.0.125 port=4760
> 
> I suspect, this is related to the parameter in the sdp,
> profile_level_id and sprop_parameter_sets_str
> What's the suitable value for these two parameter are suitable for the
> x264enc used in gstreamer?
> 
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