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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