ffmpeg -f oss -i /dev/dsp wheer.mp3
ffmpeg version 0.8.4-6:0.8.4-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers
built on Nov 6 2012 16:49:20 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[oss @ 0x88beae0] /dev/dsp: No such device
/dev/dsp: Input/output error

不懂