[Live-devel] [MediaServer] Streaming mp3 file issues

[Guillaume Ferry]

Thanks Ross.
By the way, I assume the 'numChannels' parameter is unrelated too ?
I mean, a stereo mp3 file wouldn't have 'numChannels=2' set.

I'll dive further into libavformat to probe those values (if you have an
idea...you're welcome ;-) )

Thanks again,

Best regards,
Guillaume.

2009/12/1 Ross Finlayson <finlayson at live555.com>

> I'm currently using mediaServer to stream various media on a local network.
>> Next, I implemented a small RTSP client to receive & play that stream.
>>
>> It works really great with WAV/PCM files, but I experience some issues
>> with MP3 files.
>> After some investigation, I found out what is going on : I use
>> systematically provided samplerate (rtpTimeStampFrequency), which is set to
>> 90khz for mP3 files (RTP payload :14)...
>> Incorrect value of course, and it messes up all my playback routines
>> afterwards...
>>
>> Is it possible to obtain an accurate sample rate value through liveMedia
>> classes, or do I need to do some computing ?
>>
>
> The latter.  The sampling frequency for MPEG-1 or 2 audio (which includes
> 'MP3') is encoded in the data's MPEG audio header.  It has nothing to do
> with the RTP timestamp frequency.
> --
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
> _______________________________________________
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> live-devel at lists.live555.com
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>
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