[gst-devel] AC3 audio on gstreamer + rtp

Eric Zhang nicolas.m.zhang at gmail.com
Fri Dec 19 09:25:39 CET 2008

Hi, gstreamer-devel:

    1. I don't know what "flump3dec" is but I usually add a "mp3parse"
before the mp3 decoder. If "flump3dec" does the works by "mp3parse", this is
not a problem.

    2. Modify your pipeline and try to add "filesink" to make sure the every
stage is correct. For example, add filesink after aac encoder is finished
and you can get an aac file, then try to play this aac file. Also, you can
receive the data be sent by udpsink and check whether the data is correct.
My mean is first you should locate where the problem is then you can figure
out the solution yourself.

Eric Zhang

2008/12/18 Sergio Belmar Argudo <belmar_argudo at yahoo.es>

> I'm trying to send audio form a mp3 file with gstreamer encoded with faac
> on RTP.
> The problem is that I can't play it with any player (I like to play it with
> mplayer, vlc, etc. using a SDP file)
> I'd tested it with a mp3 file and the following command:
> gst-launch-0.10 -v filesrc location=/share/sample.mp3 ! flump3dec ! queue
> max-size-buffers=0 max-size-time=0 ! ffenc_libfaac ! queue
> max-size-buffers=0 max-size-time=0 ! queue max-size-buffers=0
> max-size-time=0 ! rtpmp4apay ! udpsink host= port=6060
> and I have this SDP:
> v=0
> o=- 116704633 116704633 IN IP4
> s=GStreamer
> t=0 0
> a=range:npt=now-
> a=control:trackID=1
> c=IN IP4
> m=audio 6060 RTP/AVP 96
> a=rtpmap:96 MP4A-LATM/48000/2
> But there is no sound in mplayer or vlc.
> I also tried faac and ffenc_libfaac to encoding, rptmpapay and rtpmpa4pay
> to packetise, MP4A-LATM and mpeg-generic in SDP file..., but nothing.
> Has Anybody any idea?
> Has Anybody tried anything like that?
> Is it a problem only with audio encoding or SDP file config or is there a
> bug in any part?
> Thanks
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