Thanks Bill,
The signals I need to record will come from multiple sources (radio stations) that outputs stereo format, so I guess it means I'd need a "-c 2" parameter in each of my arecord command then? In what cases is "-c 18" in your example applicable?
More noob questions: how would arecord determine which channels exactly to get its signals? This card supports up to 64 input channels, I assume not all of them will be used at least in the beginning. Is this where the asoundrc and/or "-D hw:.." comes into picture?
/ Vincent
On Thu, May 2, 2013 at 7:52 PM, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
On Thu, 2 May 2013, Vincent Gulinao wrote:"Multiple Stereo signals" means what? I have no idea about the MADi interface
Hi everyone,
I have a task to setup a system that will continuously capture multiple
stereo signals using a MADI audio card (RME HDSPe MADI) and write them into
files (perhaps in 1 hour chunks). Few checks I've learned while googling on
the topic looks like that my linux setup seem to recognize the card at
least.
or how alsa supports it. But if it does, it may be as simple as arecord -Dhw:0 -c 18 -r 48000 -f SB24_LE output.wav
which would keep recording forever into output.wav. You could also use the -d 3600 to tell it to record for exactly an hour. You
would then have to have a script to restart it to a different output file, but
would miss a bit of the stream because of the time to stop and restart. I vaguely recall a recording program that will automatically dump into a new
file every x secods, presumably not missing anything, but cannot remember it
now.
(Note the above tells arecord to use the hardware input, not put it through a
filter like rate changing etc, tells it you want 18 channels, a rate of 48000
samples per sec on each channel, and the input is in 24 bit format with Low
Order byte order.If you told us what you were trying to do, someone could probably offer better
I'm a total noob in ALSA and audio concepts in general. I've read many docs
advice.
Note that the above assumes that you alsa does support the card without
problems and the card is card 0 on your system.--
and forums (e.g. arecord, asoundrc, pulseaudio, jack, etc.) here and there.
But while I wait all those info settle in my mind, can somebody pitch here
some high-level hints on what things I need to know, or what sort of
questions should I be asking, to accomplish this task and make sure I'm on
the right direction?
Thanks in advance!
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/
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