[vlc] Re: RTSP stream playback differences between 0.8.5 precompiled Windows and Linux sources?

[John Kinson]

Thanks again Ross, but the delivery mechanism within VLC does seem to be 
relevant, to my test files at least.

If I play my two 3GP test files (H.263 video, AMR-NB audio, 3GP/MP4 
container) locally, or streamed via HTTP, then VLC (with ffmpeg enhanced 
with the live555 codec support - thanks) works fine.  Audio quality is 
as expected.

It is only if I attempt to play the content streamed via RTSP that VLC 
has trouble with AMR-NB.

I've uploaded my two test files, and the live555 test file for 
reference, to my server at the following URLs:

http://www.yellowradio.com/test/my.name.is.earl.s01.ep01.nokia.3gp
http://www.yellowradio.com/test/parking.3gp
http://www.yellowradio.com/test/live555test.amr

As you indicated, the live555 file fails to play with VLC, locally 
accessed or streamed.

For comparison, I then transcoded the episode of "my name is earl" from 
AMR-NB to AAC.  Audio playback via RTSP is fine (and via HTTP and 
locally of course).  So for my files at least, the problem does seem to 
be related to the combination of RT(S)P and AMR-NB.  That version of the 
file is available at 
http://www.yellowradio.com/test/my.name.is.earl.s01.ep01.qt.aac.3gp

I can see that there's been quite a bit of discussion already, e.g. at 
http://www.via.ecp.fr/via/ml/vlc/2006-03/msg00132.html, but this problem 
appears to be as yet unresolved.

If anyone's got any bright ideas as to how to fix this, please let me know!

Cheers

JK

Ross Finlayson wrote:
>
>> However, playback of an RTSP stream of 3GPP content (H.263 video, 
>> AMR-NB audio, 3GP/Mobile MP4 container) now starts, but the audio 
>> stutters.
>> Playback of the stream with RealPlayer works fine; playback of the 
>> file in VLC locally (without hinting) also works fine, so I believe 
>> my streaming server, and amr-nb support in VLC, to both be OK - it's 
>> the RTSP delivery of the audio which I think is the problem.  Any 
>> idea why this might be, and how I could fix this please?
>
> Version 0.8.5 of VLC still has a long-standing bug in its playing of 
> AMR audio.  This bug may be the cause of the problem that you're 
> seeing. (The bug shows up when an AMR audio RTSP/RTP stream is being 
> played, but the bug itself has *nothing* to do with RTSP/RTP streaming.)
>
> BUG REPORT (note that this bug was first reported back in March):
>
> You can demonstrate this bug by trying to play the following file
>         http://www.live555.com/test.amr
> VLC (version 0.8.5) cannot play this file, either locally, or using 
> HTTP.  However, QuickTime Player and RealPlayer can play this file OK.
>
>         Ross.
>
>


-- 
John Kinson
http://www.mirifice.com/

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