[FFmpeg-devel] ffmpeg g723

[Zalewa PL]

"ffmpeg cli where are you putting the /tmp/audio_raw_stream"
It's specified in the command line that I posted. The lines got split in a nasty way however but you should be able to easily figure out what I meant.

"Have you been able to maintain sync between audio&  video using this
method?"
Nope, but I was using ffserver and from what other people say ffserver has problems with audio syncing.


Robert Watson wrote:

> 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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