[FFmpeg-devel] ffmpeg g723

[Robert Watson]

I had a xuggler/red5 developer working on this but he's stuck with the alsa
g723 codec.
He tried this but the audio isn't acceptable...probably because it's not
being processed properly:

ffmpeg -f alsa -acodec pcm_s16le -ac 1 -ar 8000 -i plughw:1,0,1 -f v4l2 -i
/dev/video1 -r 29.97 -b:v 800 -qmax 51 -async 1 -ar 11025 -ac 1 -ab 24k
-acodec libmp3lame -vcodec libx264 -f flv rtmp://localhost/live/livestream

On Sat, Mar 10, 2012 at 1:59 PM, Zalewa PL <zalewapl at gmail.com> wrote:

> Robert Watson wrote:
>
>  I need to stream from the card to a red5 server so I don't think this
>> would
>> work.
>> Robert
>>
>> On Sat, Mar 10, 2012 at 1:30 PM, Zalewa PL<zalewapl at gmail.com>  wrote:
>>
>>  Robert Watson wrote:
>>>
>>>  I was wondering if you could help with using ffmpeg to process the audio
>>>> input from a capture card.  The card has v4l2 and alsa drivers. The card
>>>> outputs G.723-24 (3-bit samples at 8khz).  Was the g723 code you wrote
>>>> committed into the ffmpeg core?  What command line should I use to
>>>> capture
>>>> the audio from the card?
>>>> Thanks, Robert
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>>>> ffmpeg-devel at ffmpeg.org
>>>> http://ffmpeg.org/mailman/****listinfo/ffmpeg-devel<http://ffmpeg.org/mailman/**listinfo/ffmpeg-devel>
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>>>> >
>>>>
>>>>  Hi,
>>>
>>> You can use 'decode-g72x' tool to convert data in G.723-24 format to raw
>>> PCM that can be forwarded to ffmpeg. The source code of the tool is
>>> available here:
>>> //http://www.ps-auxw.de/g72x++****.tar.bz2<http://www.ps-auxw.de/g72x++**.tar.bz2>
>>> <http://www.ps-auxw.**de/g72x++.tar.bz2<http://www.ps-auxw.de/g72x++.tar.bz2>
>>> >
>>>
>>> The compilation is straight forward. Once you get the executable file you
>>> can run it like this:
>>> `arecord -Dhw:1,0 -traw | decode-g72x -l -3 | ffmpeg -acodec pcm_s16le -f
>>> s16le -ar<rate>  -ac<channels>  -i - /tmp/output.wav`
>>> I'm not sure if all parameters that I have specified here are correct but
>>> I'm sure you can figure it out. Write if you have any further problems.
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>>> >
>>>
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>>
> I don't know how the red5 server works exactly.
> Does it start ffmpeg child processes basing on what is written in its
> configuration file? If so then it's similar to ffserver. Perhaps there is a
> way to launch the child processes manually? ffserver allows that.
>
> If that is not an option you could also forward decode-g72x output to a
> named pipe and then use ffmpeg to read the data from that named pipe.
>
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>