比如，提取音频：
代码： 全选
avconv -vn -i testfile.wmv -vn testfile.wav
avconv version v9-309-g0e3afac, Copyright (c) 2000-2013 the Libav developers
built on Jan 26 2013 20:05:35 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, asf, from 'testfile.wmv':
Metadata:
WMFSDKVersion : 10.00.00.3802
WMFSDKNeeded : 0.0.0.0000
IsVBR : 0
Duration: 00:10:42.64, start: 0.000000, bitrate: 456 kb/s
Stream #0.0(chi): Audio: wmav2, 44100 Hz, stereo, fltp, 64 kb/s
Stream #0.1(chi): Video: wmv2, yuv420p, 352x288, 386 kb/s, 25 fps, 25 tbr, 1k tbn
File 'testfile.wav' already exists. Overwrite ? [y/N] y
Output #0, wav, to 'testfile.wav':
Metadata:
WMFSDKVersion : 10.00.00.3802
WMFSDKNeeded : 0.0.0.0000
IsVBR : 0
ISFT : Lavf54.21.2
Stream #0.0(chi): Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (wmav2 -> pcm_s16le)
Press ctrl-c to stop encoding
Application provided invalid, non monotonically increasing dts to muxer in stream 0: 28318418 >= 28304262
av_interleaved_write_frame(): Invalid argument