Recording audio from the speaker

[Dotan Cohen]

2009/8/30 David Fox <dfox94085 at gmail.com>:
> On Wed, Aug 26, 2009 at 6:02 AM, Dotan Cohen<dotancohen at gmail.com> wrote:
>> Is there some capture device that I could use to record audio that is
>> being sent to the system speakers? I need to record (legally) audio
>
> You probably want to record from the DSP source, which is the signal
> sent to the speakers from the sound card. But be careful. For instance
> if you have a microphone active that is not muted, you'll record
> coughing and key clicks too :).
>
> I used that technique, successfully, when using sox to record radio
> programs that I was listening to at the same time, or at a specified
> time using cron.
>
> #! /bin/sh
> sox -V -c2 -r 44100 -t ossdsp -w -s /dev/dsp $1.ogg
>
>
> You can use it to record raw, wav, or ogg (I think the latter is
> limited to 128k/sec, though). But the trick is the -t ossdsp
> parameter. The other parameters set the number of channels (-c2), the
> sample rate (r 44100), and the type of sample data (-w -s I think are
> unsigned shorts).
>
>

Thanks! It seems that ossdsp is not a valid filetype on my system, and
I cannot find a list of valid filetypes to choose from. Furthermore,
the -w option is invalid on my system as well. How can I get a list of
valid filetypes, and what is the -w option for on your system?


-- 
Dotan Cohen

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