[FFmpeg-devel] ffmpeg g723

[Robert Watson]

also on the ffmpeg cli where are you putting the /tmp/audio_raw_stream
source?

On Sat, Mar 10, 2012 at 3:46 PM, Robert Watson <robert at gillecaluim.com>wrote:

> Thanks, I'll give that a try [?]
> Have you been able to maintain sync between audio & video using this
> method?
> Robert
>
>
> On Sat, Mar 10, 2012 at 3:28 PM, Zalewa PL <zalewapl at gmail.com> wrote:
>
>> Hah! Bluecherry. I was suspecting that you are using their product.
>> Thankfully I have some experience with this card and I can assure that it
>> is possible to get the audio from this card using the 'decode-g72x' tool.
>> Now that you have given us the ffmpeg command line that you use to create
>> the video stream, here's what you have to do. Bash commands incoming:
>>
>> # Creates a named pipe
>> mkfifo /tmp/audio_raw_stream
>>
>> # Extract audio data from the ALSA device. Decode it from g723 to PCM.
>> # NOTE: Make sure this runs in background. You can't close this
>> # pipeline or the streaming from ffmpeg will stop.
>> arecord -Dplughw:1,0,1 -traw | decode-g72x -l -3>  /tmp/audio_raw_stream
>>
>> # ffmpeg now reads from the named pipe instead of the ALSA device
>> # and decodes audio properly.
>> ffmpeg -f s16le -acodec pcm_s16le -ac 1 -ar 8000 -i /tmp/audio_raw_stream
>> -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
>>
>> Trust me: unless I made a mistake in the parameters, this will work. I've
>> been there. I've done that.
>>
>> Robert Watson wrote:
>>
>>  The card is manufactured by BlueCherry and has v4l2&  alsa opensource
>>>
>>> drivers.  This is what they said:
>>>
>>> Since Alsa currently doesn't have a format for G.723, the driver shows it
>>> as unsigned 8-bit PCM audio.  We have sent a patch that was included in
>>> alsa-kernel (hopefully getting synced to mainline soon). But this only
>>> defines the correct format, it doesn't change the way you handle it at
>>> all.
>>>  You must convert G.723-24 (3-bit samples at 8khz) yourself.
>>>
>>> And, thanks for your help :)
>>> Robert
>>>
>>> On Sat, Mar 10, 2012 at 2:32 PM, Benjamin Larsson<benjamin at southpole.se>
>>> **wrote:
>>>
>>>  On 03/09/2012 10:24 PM, 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
>>>>>
>>>>>  G.723 and G.723.1 is not the same. So it wont work. And probably the
>>>> card
>>>> doesn't output G723. Elaborate in detail and we might be able to help.
>>>>
>>>> MvH
>>>> Benjamin Larsson
>>>>
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>>>>
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>>
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