一行命令解决电视盒子播放电视剧无声音的问题

 快过年了，防止无聊，下载了部经典喜剧在电视盒子上看看。

现在片源越来越不好找了，好不容易下了部 

回家在机顶盒上一播放，傻眼了，有图像没声音，声道切换也不管用

这点事情难不倒程序猿，ffprobe查看视频属性

ffprobe 01.mkv

 结果

ffprobe version 4.1.3 Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, matroska,webm, from '01.mkv':
  Metadata:
    encoder         : libebml v1.3.0 + libmatroska v1.4.0
    creation_time   : 2014-08-06T02:14:45.000000Z
  Duration: 00:42:07.96, start: 0.000000, bitrate: 2324 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 720x540 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1k tbn, 50 tbc (default) (forced)
    Metadata:
      title           : [e-mail]小五压制
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default) (forced)
    Metadata:
      title           : 国语
    Stream #0:2: Subtitle: ass (default) (forced)
    Metadata:
      title           : 简体中字
    Stream #0:3: Subtitle: ass
    Metadata:
      title           : 繁体中字

多出了几个Stream，删除掉这些，应该就能顺利播放，新建out目录

mkdir out

解释那么多核心命令就是这一行： 

find . | grep mkv| sed 's#./##g' |xargs -n 1 -I {}  ffmpeg  -i {}  -map 0:0 -map 0:1  -vcodec copy -acodec copy out/{}

所有处理后的视频都放到当前文件夹out子目录里

再次用ffprob查看处理后的结果

ffprobe 01.mkv
ffprobe version 4.1.3 Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, matroska,webm, from '01.mkv':
  Metadata:
    ENCODER         : Lavf58.20.100
  Duration: 00:42:07.96, start: 0.000000, bitrate: 2325 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 720x540 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1k tbn, 50 tbc (default) (forced)
    Metadata:
      title           : [e-mail]小五压制
      DURATION        : 00:42:07.960000000
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default) (forced)
    Metadata:
      title           : 国语
      DURATION        : 00:42:07.904000000

轨道正常一个Video，一个Audio，机顶盒顺利播放！

 

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