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ffmpeg -concat 减慢 AAC 音频文件的速度

tag-icon • tag-icon ffmpeg aac m4a
ffmpeg -concat 减慢 AAC 音频文件的速度

我用这个命令连接六个 m4a 文件

ffmpeg -f concat -i audiofiles.txt -c copy all_audio_edited.m4a

每个文件的时长为 4 小时（总共 24 小时），但连接效果不太好：文件的第一部分（第一个 m4a）是完美的，但其他部分都变慢了，所以最终的时长>26 小时

怎么了？

谢谢

Marcs-MacBook-Pro:Sof marc$ ffmpeg -report -f concat -i audiofiles.txt -c copy all_audio_edited.m4a
ffmpeg started on 2014-08-28 at 23:35:06
Report written to "ffmpeg-20140828-233506.log"
ffmpeg version 2.3 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 26 2014 17:59:15 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-openssl --enable-libopus --enable-frei0r --enable-libcaca --enable-libquvi --enable-libvidstab --enable-libx265 --enable-libopenjpeg --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1_1/include/openjpeg-1.5 '
  libavutil      52. 92.100 / 52. 92.100
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.100 / 55. 48.100
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.100 /  4. 11.100
  libavresample   1.  3.  0 /  1.  3.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
[concat @ 0x7fcb6c803400] Estimating duration from bitrate, this may be inaccurate
Input #0, concat, from 'audiofiles.txt':
  Duration: 00:00:00.00, start: 0.000000, bitrate: 279 kb/s
    Stream #0:0: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 280 kb/s
Output #0, ipod, to 'all_audio_edited.m4a':
  Metadata:
    encoder         : Lavf55.48.100
    Stream #0:0: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, 280 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 3020597kB time=26:07:14.44 bitrate= 263.1kbits/s    
video:0kB audio:3004946kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.520849%

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