I am looping the "PCM audio in" to the "PCM audio out" on a Sound Blaster USB card using the following command:
arecord -q -f S16_LE -r 48000 -c 2 -D dsnoop:HD | aplay -q -D plughw:HD
It works fine, but only for about three hours. The command is in a while loop which restarts it when it stops and also records the time at which the command is restarted. It has run for the following lengths of time:
h m s
About 11,187 seconds, give or take. These seem too similar to be the result of a random fault. The man pages for aplay and a record say that a duration of 0 means infinity.
Any suggestions as to why it stops reliably after 3hr 6min and 27seconds?