[vlc] Re: AMR stream query

[chris.2.dobbs at bt.com]

Ok, Thanks Alex.
I have actually used the live55 stuff to run up an AMR RTSP streamer (this is what I'm using to test agst VLC with). This works fine with the ffmpeg ffplay program (now that I fixed the sdl layer to recognise AMR correctly).
 
I think it's simply that vlc is pulling the amr payload datat out of the rtp packet incorrectly.
Cheers for your help -  will let u know if I can crack it
-Chris 

________________________________

From: vlc-bounce at videolan.org on behalf of Alex Antropoff
Sent: Fri 3/17/2006 11:01 AM
To: vlc at videolan.org
Subject: [vlc] Re: AMR stream query



On Fri, Mar 17, 2006 at 10:40:46AM -0000, chris.2.dobbs at bt.com wrote:
> All,
> I have recently fixed a bug in the ffmpeg project to allow me to play (using the ffplay tool) AMR-NB over rtsp.
> I now want to play this stream using vlc so I rebuilt vlc using the new ffmpeg libraries I have made and vlc seem to recognise the stream type ok now and opens the correct codec inside the ffmpeg libraries but I just get noise on the audio playback.
> 
> I have narrowed the problem down to the following routine (inside ffmpef)
> 
> amr_nb_decode_frame()
> 
> Which normally is passed a buffer containg the amr frame in which the first byte should be the toc byte , I have compared this to the output of ffplay and I get different data in the buffer - this suggests to me that vlc is incorrectly unpacking the rtp payload.
> 
> 
> I wondered of anyone out there could point me at the correct code area within vlc where this operation takes place as the code base is HUGE and after having a quick look i can't see where it's done.
> 
> Many thanks in advance,
> -Chris Dobbs
VLC use for receiving rtsp/rtp "LIVE555 Streaming Media" libraries.
See modules/demux/livedotcom.cpp
I got the same problem as you.

--
Regards,
Alex Antropoff

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