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使用 ffmpeg 转换为 mp3 后，.swf 文件被截断

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使用 ffmpeg 转换为 mp3 后，.swf 文件被截断

所以我有一个 .swf 文件，需要将其转换为 .mp3（或任何其他音频文件），它看起来像这样：

vytautas@vytautas-SATELLITE-C660:~/Desktop$ ffmpeg -i rem.swf
ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  built on May 18 2014 02:20:25 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libx264 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
  libavutil      52. 84.100 / 52. 84.100
  libavcodec     55. 62.100 / 55. 62.100
  libavformat    55. 38.100 / 55. 38.100
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  5.100 /  4.  5.100
  libavresample   1.  2.  0 /  1.  2.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
[swf @ 0x2762ae0] SWF compressed file detected
[swf @ 0x2762ae0] Could not find codec parameters for stream 0 (Audio: pcm_u8, 5512 Hz, mono, 44 kb/s): unspecified sample format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, swf, from 'rem.swf':
  Duration: 00:00:00.55, bitrate: 98 kb/s
    Stream #0:0: Audio: pcm_u8, 5512 Hz, mono, 44 kb/s
    Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 128 kb/s
At least one output file must be specified

所以它的长度是：00:00:00.55，然后我使用此命令将其转换为.mp3：

 ffmpeg -i rem.swf -map 0:1 -acodec copy rem.mp3

这是我得到的输出：

**output ommited, as it is same as above**
Input #0, swf, from 'rem.swf':
  Duration: 00:00:00.55, bitrate: 98 kb/s
    Stream #0:0: Audio: pcm_u8, 5512 Hz, mono, 44 kb/s
    Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 128 kb/s
File 'rem.mp3' already exists. Overwrite ? [y/N] y
Output #0, mp3, to 'rem.mp3':
  Metadata:
    TSSE            : Lavf55.38.100
    Stream #0:0: Audio: mp3, 22050 Hz, mono, 128 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=       5kB time=00:00:00.33 bitrate= 130.7kbits/s    
video:0kB audio:5kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.080189%

所以现在长度只有 00:00:00.33，有什么想法吗？

这是文件的链接，即使您可以尝试在自己的机器上进行转换，这也会有所帮助：

https://docs.google.com/file/d/0ByJlZbStPk2cS0FwN09TX2VkWjg/edit

提前致谢！

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