Lenz wrote:
Hello list,
after the last time that mpg123 wen ballistic on our production
system, we decided to skip mp3 playback altogether and to go for raw
files. After half an hour playing with mpg123 and sox parameters in
order to translate a mp3 file to a wav file that can be streamed back
through * with no need for an mp3 decoder, I thought I'd post the
result to the list to avoid wasting time in the future:
The correct paramater set seems to be:
mpg123 -s --rate 44100 --mono /src/mp3/fpm-sunshine.mp3 >
fpm-sunshine.raw
sox -r 44100 -w -s -c 1 fpm-sunshine.raw -r 8000 -c 1 fpm-sunshine.wav
I have also prepared a small tutorial explaining how to setup the
whole thing (you can find it at
http://www.oinko.net/astrecipes/index.php?n=152 - feel free to add or
modify it if you think it's necessary).
Thanks
l.
Lenz,
This method is referred to as file-based or native MOH, and I have some
additional information regarding it. First, a short post on why we
moved from the rawplayer method to native MOH on our production box,
with a quote from Kevin Fleming regarding the impact the change would
have on scalability.
-
http://lists.digium.com/pipermail/asterisk-users/2006-February/141180.html
Second, I *believe* (please correct me if I'm wrong) that in order to
get the full benefits of native MOH, the music files should be converted
to the codec that the calls will be in. This allows Asterisk to play
MOH without performing any transcoding, which lowers the resource
utilization on the box. Here is a guide for converting WAV files to the
desired codec, which addresses the four characteristics that describe
audio data.
- http://lists.digium.com/pipermail/asterisk-users/2006-March/142108.html
Please feel free to add any of this information to your site and don't
hesitate to contact me if you spot any mistakes.
Thank you,
Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer
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