Re: What program to record from /dev/dsp
hallo.
you perhabs want to try out ecasound (www.eca.cx). in newer dev versions
it supports large files. you might have to compile it yourself as this
feature is configured at compile time. ecasound is able to record and
convert to wave in one step (you won't need sox), it can even record
'directly' to mp3 (with an external program).
On Sun, 8 Sep 2002, Viktor Rosenfeld wrote:
> Hi there,
>
> I wanted to record a concert which was broadcasted on the radio and got
> burned by the 2G file size limitation.
>
> Here's the command line I used:
>
> rawrec -v -t 36600 | \
> sox -t sw -r 44100 -c 2 - -t wav - | \
> lame --alt-preset insane - `date +%T`.mp3
>
> Packages: rawrec, sox, self-compiled lame.
>
> I only used lame, because I thought my system wasn't LFS-ready (Large
> File Support). The resulting file was 464 MB in size, which would be
> exactly 2G if it were a wav file. The audio stops at 202:53 minutes,
> exactly the length that fits in a 2G wav file.
>
> Turns out, that my system is partially LFS-ready. Ie, the command
>
> dd if=/dev/zero of=/tmp/large-file bs=1M count=2560
>
> (as suggested in another thread, recently) creates a file that is 2.5 GB
> big. (Both on a local harddrive and on a NFS-mounted file system.)
>
> So the problem is either in the piping of the contents or one of the
> programs isn't LFS-ready. Crap.
>
> I'm using an partially up-to-date sid system. rawrec and sox are
> up-to-date, lame is self-compiled, so I'm not sure, that this wasn't the
> bottleneck. I'm pretty sure, that the piping wasn't either, because
>
> cat /dev/zero > big-file
>
> produced a file that is bigger than 2G.
>
> Here's the output from the at job:
>
> rawrec: warning: speed (-s) will be set to 44101 instead of requested
> value of 44100
> sox: Length in output .wav header will be wrong since can't seek to fix it
> LAME: Can't get "TERM" environment string.
> LAME version 3.91 (http://www.mp3dev.org/)
> Using polyphase lowpass filter, transition band: 20094 Hz - 20627 Hz
> Encoding <stdin> to /home/viktor/radio/fritz-7.9.2002-seeed-live.mp3
> Encoding as 44.1 kHz 320 kbps j-stereo MPEG-1 Layer III (4.4x) qval=2
> rawrec: write syscall to output failed: Broken pipe
> rawrec: main buffer overflow, giving up
>
> I'm guessing that sox is the problem here.
>
> I've played along with the rec command from sox, but I get crappy audio
> when recording from /dev/dsp.
>
> What's a good way to record audio from /dev/dsp? I'm looking for a
> solution that creates wav files that are bigger than 2G *and* works on
> the command line. The command line is necessary, because I want to
> schedule recordings with at.
>
> Any hints are appreciated. I'm using an partially up-to-date
> sid system. rawrec and sox are up-to-date, lame is self-compiled, so
> I'm not sure, that this wasn't the bottleneck. I'm pretty sure, that
> the piping wasn't either, because
>
> cat /dev/zero > big-file
>
> produced a file that is bigger than 2G.
>
> Ciao,
> Viktor
>
> PS: The concert in question was Seeed, who played today in the Arena,
> Berlin. Radio Fritz broadcasted it. I have the Gentleman set in
> beautiful beautiful quality, if anybody is interested, but Seeed got cut
> off after 15 minutes of their set. Fuck.
> --
> Viktor Rosenfeld
> WWW: http://www.informatik.hu-berlin.de/~rosenfel/
>
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