[gst-devel] RTP streaming MPEG-4 video: Bugs?

[Deeptendu Bikash]

Thanks a lot Wim. The stuff worked.

Deeptendu

On 8/11/06, Wim Taymans <wim at fluendo.com> wrote:
>
> On Fri, 2006-08-11 at 11:25 +0530, Deeptendu Bikash wrote:
> Hi,
>
> > Problem 1)
> > I am trying to stream MPEG-4 video (MP4V-ES) using RTP. On the sender
> > side I give:
> > gst-launch videotestsrc ! ffenc_mpeg4 ! rtpmp4vpay ! udpsink port =
> > 1234
> > This is producing packets as can be seen from Ethereal packet capture.
> > On decoding the packet as RTP, I can see the payload typ as 96.
> >
> > On the sender side I type:
> > gst-launch udpsrc port=1234 !
> > application/x-rtp,clock-rate=90000,pt=96 ! rtpmp4vdepay !
> > ffdec_mpeg4 ! xvimagesink
> <snip>
>
> This should becoma FAQ. For RTP streaming there is a lot of info that
> needs to be passed to the receiver using some out-of-band mechanism such
> as SDP. In GStreamer there is a mapping from SDP to GstCaps defined. The
> proper procedure to set up an RTP streaming session is:
>
> On the sender:
>
>   gst-launch -v videotestsrc ! ffenc_mpeg4 ! rtpmp4vpay ! udpsink port =
> 1234
>
> You need the -v option so that you can see the caps set on the sinkp pad
> of udpsink. This will then result in output like this:
>
> Setting pipeline to PAUSED ...
> /pipeline0/videotestsrc0.src: caps = video/x-raw-yuv,
> format=(fourcc)I420, width=(int)320, height=(int)240,
> framerate=(fraction)30/1
> Pipeline is PREROLLING ...
> /pipeline0/ffenc_mpeg40.src: caps = video/mpeg, width=(int)320,
> height=(int)240, framerate=(fraction)30/1, mpegversion=(int)4,
> systemstream=(boolean)false
> /pipeline0/ffenc_mpeg40.sink: caps = video/x-raw-yuv,
> format=(fourcc)I420, width=(int)320, height=(int)240,
> framerate=(fraction)30/1
> /pipeline0/rtpmp4vpay0.sink: caps = video/mpeg, width=(int)320,
> height=(int)240, framerate=(fraction)30/1, mpegversion=(int)4,
> systemstream=(boolean)false
> /pipeline0/rtpmp4vpay0.src: caps = application/x-rtp,
> media=(string)video, payload=(int)96, clock-rate=(int)90000,
> encoding-name=(string)MP4V-ES, ssrc=(guint)3197754544,
> clock-base=(guint)1459048008, seqnum-base=(guint)46431,
> profile-level-id=(string)1,
>
> config=(string)000001b001000001b58913000001000000012000c48d8800f6185020f0a21f000001b24c61766335312e392e30
> /pipeline0/udpsink0.sink: caps = application/x-rtp, media=(string)video,
> payload=(int)96, clock-rate=(int)90000, encoding-name=(string)MP4V-ES,
> ssrc=(guint)3197754544, clock-base=(guint)1459048008,
> seqnum-base=(guint)46431, profile-level-id=(string)1,
>
> config=(string)000001b001000001b58913000001000000012000c48d8800f6185020f0a21f000001b24c61766335312e392e30
> Pipeline is PREROLLED ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
>
> Now look at the caps set on /pipeline0/udpsink0.sink. These caps are
> typically converted to an SDP message and send to the receiver when a
> connection is made. We are not doing any session setup here, just
> connecting to the raw RTP stream so we need another way of getting this
> info to the receiver. We simply copy the caps over.
>
> Then on the receiver you do:
>
> gst-launch udpsrc port=1234 caps="application/x-rtp,
> media=(string)video, payload=(int)96, clock-rate=(int)90000,
> encoding-name=(string)MP4V-ES, ssrc=(guint)3197754544,
> clock-base=(guint)1459048008, seqnum-base=(guint)46431,
> profile-level-id=(string)1,
> config=(string)000001b001000001b58913000001000000012000c48d8800f6185020f0a21f000001b24c61766335312e392e30"
> ! rtpmp4vdepay ! ffdec_mpeg4 ! xvimagesink
>
> This will then stream the video.
>
> Notice how you need to inform the receiver of the required properties as
> defined by RFC 3016 by using the same GstCaps as seen on the sender.
>
>
> > -----------------------
> > Problem 2)
> > Instead of using the videotestsrc, I am trying to use an existing
> > MPEG-4 video elementary stream. Here I get a problem on the sender
> > side itself. My command is:
> > gst-launch filesrc location= test.m4v ! rtpmp4vpay !
> > application/x-rtp,clock-rate=90000 ! udpsink port = 1234
> > Setting pipeline to PAUSED ...
> > Pipeline is PREROLLING ...
> > ERROR: from element /pipeline0/rtpmp4vpay0: Element doesn't implement
> > handling of this stream. Please file a bug.
> > Additional debug info:
> > gstbasertppayload.c(420): gst_basertppayload_push
> > (): /pipeline0/rtpmp4vpay0:
> > subclass did not specify clock_rate
> > ERROR: pipeline doesn't want to preroll.
> > Setting pipeline to NULL ...
> > FREEING pipeline ...
>
> I have no idea what that test.m4v is. We currently don't handle parsing
> of arbitrary elementary mpeg4 video streams, though. For streaming of
> MPEG4 video in an ISO container you would do the following:
>
> gst-launch -v filesrc location=~/data/sincity.mp4 ! qtdemux !
> rtpmp4vpay ! udpsink port = 1234
>
> then grab the caps set on the udpsink and start the receiver with the
> same caps as in the first example.
>
> Hope this helps.
>
> Wim
>
> >
> > Can you please help me out?
> >
> > Thanks,
> > Deeptendu.
>
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