Problem with udpsrc in gst-rtsp-server

[Morris Ford]

Thanks a lot for your help. That was the key to getting it to run. I now
have a working rtsp-server pipe thus:

./test-launch "( udpsrc port=5000 caps=\"application/x-rtp,
media=\(string\)video, clock-rate=\(int\)90000,
encoding-name=\(string\)H264,  payload=\(int\)96, ssrc=\(guint\)2396357661,
clock-base=\(guint\)2297066863, seqnum-base=\(guint\)49439\" ! rtph264depay
! ffdec_h264 ! ffmpegcolorspace ! videoscale ! x264enc ! rtph264pay
name=pay0 pt=96 sync=false )"

Problem now is that there is a 3 - 4 second latency when playing using that
pipeline and playing the resulting video through vlc or quicktime.

My question: How do I find what is causing the delay and what can I do to
reduce the delay?

Thanks
Morris

On Mon, Feb 28, 2011 at 2:33 AM, Marco Ballesio <gibrovacco at gmail.com>wrote:

> Hi,
>
> On Mon, Feb 28, 2011 at 3:05 AM, Morris Ford <morrishford at gmail.com>
> wrote:
> > I am working on receiving an udpsrc stream and publishing it as an rtsp
> > stream. This gst-launch string works just fine to receive the stream:
> > gst-launch-0.10 -v udpsrc port=5000 caps="application/x-rtp,
> > media=\(string\)video, clock-rate=\(int\)90000,
> > encoding-name=\(string\)H264,  payload=\(int\)96,
> ssrc=\(guint\)2396357661,
> > clock-base=\(guint\)2297066863, seqnum-base=\(guint\)49439" !
> rtph264depay !
> > decodebin ! ffmpegcolorspace ! videoscale ! xvimagesink sync=false
> > but when I try to take that pipeline and put it into a test-launch, I get
> > complaints about not being able to set the caps on udpsrc to
> > application/x-rtp.
> > Like this:
> > ./test-launch "( udpsrc port=5000 caps="application/x-rtp,
> > media=\(string\)video, clock-rate=\(int\)90000,
>
> It's just about bash syntax. The way you're using the " make bash
> thinking you're passing test-launch a first argument like this:
>
> ( udpsrc port=5000 caps=
>
> concatenated to:
>
> application/x-rtp,
>
> and a second argument like:
>
> media=\(string\)video,
>
> useless to say this is not what you should pass to the test-launch
> command. I suggest you to try replacing the outmost pair of " with '
> or the innermost ones with \"
>
> Regards
>
> > encoding-name=\(string\)H264,  payload=\(int\)96,
> ssrc=\(guint\)2396357661,
> > clock-base=\(guint\)2297066863, seqnum-base=\(guint\)49439" !
> rtph264depay !
> > decodebin ! ffmpegcolorspace ! videoscale ! x264enc ! rtph264pay
> name-pay0
> > pt=96 )"
> > ** (lt-test-launch:20772): CRITICAL **: could not parse launch syntax ((
> > udpsrc port=5000 caps=application/x-rtp,): could not set property "caps"
> in
> > element "udpsrc0" to "application/x-rtp,"
> > ** (lt-test-launch:20772): CRITICAL **: could not create element
> > I could not find any examples of udpsrc in a test-launch line or udpsrc
> in a
> > gst-rtsp-server 'c' program so I am not at all sure if what I am trying
> to
> > do is valid.
> > Morris
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
> >
> _______________________________________________
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>
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