Re: LF: Octo-soundcard for the Raspi, question

[Paul Nicholson <vlf0403@abelian.org>]

Stefan wrote:

> So that's a factor 4. Why is the file 4 times larger
> than expected?

Because @raw3 is format float8 instead of int2 as you
expected.

@raw2 is int2 but the resampling into @raw defaults to
float8 again.

You can drop one of the stages:

 sudo vtcard –d hw:1,0 –r96000 –b32 –c8 –B @raw

 vtresample –r24000 –B @raw:1,2,3 @raw2,i2

 vtwrite –B @raw2 /media/usbstick

will have the desired effect because @raw2 is int2 format
and vtwrite always writes with the format of its input
stream.

If you don't need to tee anything else off @raw2,
you can pipeline it and save some overhead of the
circular buffer:

 vtresample –r24000 –B @raw:1,2,3 -- -,i2 |
   vtwrite –B @raw2 /media/usbstick

PS, you'll have to delete the existing files under /media/usbstick
(these will be f8 not i2), you can't mix formats in the same
signal database.

--
Paul Nicholson
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