[gst-devel] MPEG4 Compliant Simple Profile

[Mailing List SVR]

In data giovedì 12 novembre 2009 13:34:01, Mailing List SVR ha scritto:
: > In data martedì 10 novembre 2009 10:51:39, Jānis Rukšāns ha scritto:
> : > On Mon, Nov 9, 2009 at 6:39 PM, Mailing List SVR
> >
> > <lists at svrinformatica.it> wrote:
> > > In data lunedì 9 novembre 2009 17:27:58, Edward Hervey ha scritto:
> > > : > On Mon, 2009-11-09 at 15:45 +0100, Mailing List SVR wrote:
> > >> >
> > >> > In data lunedì 9 novembre 2009 14:21:38, Kapil Agrawal ha scritto:
> > >> > : > if the data is send as rtp, then you have to use  proper rtp
> > >> > : > depayloader
> > >> > >
> > >> > > after udpsrc and then store the file.
> > >> >
> > >> > this is the point: the stream seems not rtp payloded or at least
> > >> > gstreamer doesn't recognize it as rtp
> > >> >
> > >> > gstbasertpdepayload.c(360): gst_base_rtp_depayload_chain ():
> > >> > /GstPipeline:pipeline0/GstRtpMP4VDepay:rtpmp4vdepay0:
> > >> > Not RTP format was negotiated
> > >> >
> > >> > but the stream would be rtp according to verint,
> > >>
> > >>   You can't use rtp without the specification of the streams. Those
> > >> specifications normally come in a sdp file.
> > >
> > > Yes I know, I asked to the manufacter (verint) for the sdp but their
> > > answer was that the sdp was not available and I have to use their sdk
> > > (windows dll) to integrate the stream, but I'm on linux.
> > > However I think the stream is in a standard format, my reseller was
> > > able to see the video over rtp with a decoder of a different manufacter
> > > (not verint). So I need a way to reverse enginering the sdp/ get
> > > gstreamer caps
> >
> > You can try something like this:
> >
> > udpsrc port=2544 !
> > application/x-rtp,media=video,payload=96,clock-rate=90000,encoding-name=M
> >P4 V-ES,profile-level-id=1 ! rtpmp4vdepay ! decodebin ...
> >
> > Replace 96 with the actual payload type (can be extracted by capturing
> > the stream w/ Wireshark) and 90000 with the actual clock rate.
> 
> some progress here thanks, using wireshark I discovered the payload type is
> 121 but I cannot find the clock rate can you give me some additional infos?
> 
> Attacched is an image with the correct payload (changing the clock rate
>  there are no visible changes), as you can see the image is duplicated I
>  need a way to specify image size, seems not possible to use width and
>  heigth in caps parameters,
> 
> Nicola
> 
Here is the pipeline I used to see the duplicated video:

gst-launch-0.10 -v udpsrc port=2544 caps="application/x-rtp, 
media=(string)video, payload=(int)121, clock-rate=(int)90000, encoding-
name=(string)MP4V-ES, profile-level-id=(string)1" ! decodebin ! autovideosink