Subject: Re: [linux-audio-dev] miniDV audio format
From: Eric Dantan Rzewnicki (rzewnickie_AT_rfa.org)
Date: Fri Aug 27 2004 - 21:01:02 EEST
On Thu, Aug 26, 2004 at 09:04:00PM -0400, Jamie Guinan wrote:
> On Thu, 26 Aug 2004, Eric Dantan Rzewnicki wrote:
> > 1)Does anyone know what format digital audio is stored in for miniDVs?
> > I know the audio can be 12 or 16 bit and I know that (at least for the
> > tapes I have) SP is about 60 minutes and LP is about 90 minutes. So, I
> > figure the sample rates are probably something like 48kHz for SP and
> > 32KHz for LP, but I haven't found a definitive reference, yet.
> > I ask because I've had a canon zr60 miniDV camcorder for about a year
> > and have recently started using it to collect sounds. For now I'm
> > recording from the analog output of the camcorder into my delta66.
> > Obviously, this is less than ideal, but far superior to the handheld
> > voice recorder analog cassette tape solution I've been using for the
> > past 8 years. :-]
> > 2)I've briefly glanced over the web page for kino:
> > http://kino.schirmacher.de/article/static/2
> > It appears kino will handle recording the video from a ieee1394
> > connection and also includes a tool for stripping audio out of the video
> > to a wav file. Anyone here have any experience to share in using kino,
> > or any other package, to do something like this?
> This works for me, with 2.6.x kernels,
>
> <press play on camcorder>
> $ cat /dev/ieee1394/dv/host0/NTSC/in > foo.dv
> $ playdv --disable-video --audio-file=foo.raw foo.dv
> Audio is 32.0 kHz, 12 bits quantization, 2 channels, emphasis off
> <ctrl-c>
> $ sox -r 32000 -c 2 -s -w foo.raw foo.wav
> <fire up favorite .wav editor>
>
> You need to have the right modules loaded/built-in, and the libdv
> package (might be in your distro) for playdv. I saw reference
> to audacity having a good .raw loader, so you might try that
> instead of sox.
>
> > 3)Does it matter what ieee1394 interface I get, or are they all
> > basically the same as long as there's kernel support for them?
>
> Popular OHCI chipsets should work.
Great, thanks Jamie.
-Eric Rz.
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