Comment 7 for bug 542326

Hmmm, according to http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=448761#14 this is no real core dump (as in "segfault"). mplayer tries to be funny when it saved the received (or to be encoded) file or stream as stream.dump.

In addition to that, the extraction of the audio stream from some video file or stream doesn't seem to be possible yet. Citing from http://www.mplayerhq.hu/DOCS/HTML/en/faq.html#id2946830 ...

Q: How do I encode only sound from a music video?

A: It's not possible directly, but you can try this (note the & at the end of mplayer command):

mkfifo encode
mplayer -ao pcm -aofile encode dvd://1 &
lame your_opts encode music.mp3
rm encode

This allows you to use any encoder, not only LAME, just replace lame with your favorite audio encoder in the above command.