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mongodb 转换失败记录如下
xx@xx:~/convert$ ffmpeg -i a.mp3 -ar 8000 -ac 1 -ab 32 a.amr
ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
built on Mar 30 2013 22:20:06 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.
[mp3 @ 0x1a67940] max_analyze_duration reached
[mp3 @ 0x1a67940] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'a.mp3':
Duration: 00:00:53.76, start: 0.000000, bitrate: 128 kb/s
Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
Output #0, amr, to 'a.amr':
Stream #0.0: Audio: [0][0][0][0] / 0x0000, 8000 Hz, 1 channels, s16, 200 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Encoder (codec id 73728) not found for output stream #0.0