[gst-devel] recording a file from stream

George Beasley george.beasley at d2see.com
Wed Sep 19 11:05:10 CEST 2007

I don't think your issue is with your pipeline, I think it's with the
way you terminate the stream. I've been recording from a rtp streams
(h263 and amr) and I found that you cannot simply Ctrl-C to stop
to-command-line streaming as the muxer needs to close down gracefully
(essentially it needs to write a table of contents in the file) and
that's why the file created doesn't play back. To test this add the
num-buffers=50 property to the udpsrc; after receiving 50 buffers it
will send an EOS message through the pipeline and close it down

I have had problems with the rtpamrdepay however the issues I had don't
seem to be related to yours. My issues were that it would perpetually
fail to recognise that I had provided it with a clock rate - however
this has now been fixed in the version available from cvs.

-----Original Message-----
From: gstreamer-devel-bounces at lists.sourceforge.net
[mailto:gstreamer-devel-bounces at lists.sourceforge.net] On Behalf Of
Terry Leung
Sent: Tuesday, 18 September 2007 09:57
To: gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-devel] recording a file from stream

Hi all,

I discover that even i do it without udpsink and udpsrc, it still
doesnt work, I suspect this is a bug...

The pipeline i use this time is:
gst-launch -v ffmux_3gp name=mux ! filesink
location=/home/video/jill3.3gp \
{filesrc location=/home/video/jill.3gp ! qtdemux name=demuxer2 !
rtpamrpay ! rtpamrdepay queue-delay=0 ! queue }! mux.audio_0

without using rtpamrpay and rtpamrdepay, this pipeline work perfectly
after adding this, the output file cannot be demux

when i try to open the output file to demux and strema it like before,
it shows that:
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /pipeline0/demuxer: This file contains no playable
Additional debug info:
qtdemux.c(1444): gst_qtdemux_loop (): /pipeline0/demuxer:
no known streams found
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
FREEING pipeline ...

The pipeline I use to stream is :
gst-launch -v filesrc location=/home/video/jill3.3gp ! qtdemux
name=demuxer \
demuxer.!queue! rtpamrpay pt=98 ! udpsink host= port=11002

anyone here has tried to use rtpamrdepay with success?

On 9/17/07, Terry Leung <terry83 at gmail.com> wrote:
> Hi all,
> I am writing a program to record rtp stream into a 3gp file(currently
only amr)
> I try to build a pipeline like the following:
> gst-launch ffmux_3gp name=mux ! filesink
> location=/home/video/receive.3gp name=file \
> {udpsrc port=11002 name=audioudp \
> caps="application/x-rtp, media=audio, payload=96, clock-rate=8000,
> encoding-name=AMR, ssrc=111111002 "\
>  ! rtpamrdepay ! queue } mux.audio_0
> After i generate stream from another source, it shows that
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> ERROR: from element /pipeline0/audioudp: Internal data flow error.
> Additional debug info:
> gstbasesrc.c(1816): gst_base_src_loop (): /pipeline0/audioudp:
> streaming task paused, reason not-negotiated (-4)
> Execution ended after 12698510000 ns.
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> FREEING pipeline ...
> anyone got idea on how to make it work?

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