[FFmpeg-devel] ffmpeg g723

Robert Watson robert at gillecaluim.com
Sat Mar 10 23:36:53 CET 2012

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 :)

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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