Still struggling with this problem, but ran some more tests: - I thought it might be a disk access or latency issue; So I invoked arecord with "nice -n -20" and directed the recording file to be created on RamDisk - same result - after 30 seconds the recorded audio file switches to a loud hissing noise for the remainder of the recording.
- I also discovered that altering the recording sample rate slightly changes the symptoms ! Specifically: nice -n -20 arecord -D hw:1,0 -c2 -f S24_3LE -r 47950 /tmp/ramdisk/t1.wav appears to work correctly for one minute and 28 seconds before switching over to the loud hissing noise ! The time period 1:28 also appears repeatable; just like the 30 seconds at 48,000. Any suggestions on how further attack this problem would be very much appreciated. Thanks, Scott. On Fri, 31 Oct 2003 20:15:03 -0500 "J. Scott Merritt" <[EMAIL PROTECTED]> wrote: > My VXPocket V2 records perfectly each time at -f S24_3LE > -c2 -r 48000 for the first 30 seconds. After 30 seconds have > passed, however, it records only a loud, hissing noise with > no evidence of the original sound source. > > The length of time until noise (30 seconds) seems very > accurate and repeatable. I've tried this on: > > 1. Linux 2.4.22 (with LowLatency) and ALSA 0.9.8 > 2. RedHat 9 and ALSA 0.9.5 > > Same results each time :( > > I tried playing the wave file back through the native sound > device and got the noise after 30 seconds - so it *appears* > to be a recording/capture problem. > (Computer is an IBM ThinkPad T40) > > If I set the recording format to "dat", it appears to > record indefinitely (> 3 minutes) with no troubles. > Unfortunately, I need the 24 bit sampling for an > urgent college research project. > > I will be happy to provide any required data to help > track this down, but I haven't a clue where to start. > > Many thanks, Scott. > > > ------------------------------------------------------- > This SF.net email is sponsored by: SF.net Giveback Program. > Does SourceForge.net help you be more productive? Does it > help you create better code? SHARE THE LOVE, and help us help > YOU! Click Here: http://sourceforge.net/donate/ > _______________________________________________ > Alsa-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-user ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
