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    【已解决】Mac中用ffmpeg从mp4视频中提取mp3音频

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    折腾：
    【已解决】用Python代码从视频中提取出音频mp3文件
    期间，在写python代码调用ffmpeg之前，先要去终端中确保用法正确。
    先看看用法：
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    ➜  61264527 which ffmpeg
    /usr/local/bin/ffmpeg
    ➜  61264527 ffmpeg --help
    ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
      built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
      configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
      libavutil      55. 78.100 / 55. 78.100
      libavcodec     57.107.100 / 57.107.100
      libavformat    57. 83.100 / 57. 83.100
      libavdevice    57. 10.100 / 57. 10.100
      libavfilter     6.107.100 /  6.107.100
      libavresample   3.  7.  0 /  3.  7.  0
      libswscale      4.  8.100 /  4.  8.100
      libswresample   2.  9.100 /  2.  9.100
      libpostproc    54.  7.100 / 54.  7.100
    Hyper fast Audio and Video encoder
    usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
     
    Getting help:
        -h      -- print basic options
        -h long -- print more options
        -h full -- print all options (including all format and codec specific options, very long)
        -h type=name -- print all options for the named decoder/encoder/demuxer/muxer/filter
        See man ffmpeg for detailed description of the options.
     
    Print help / information / capabilities:
    -L                  show license
    -h topic            show help
    -? topic            show help
    -help topic         show help
    --help topic        show help
    -version            show version
    -buildconf          show build configuration
    -formats            show available formats
    -muxers             show available muxers
    -demuxers           show available demuxers
    -devices            show available devices
    -codecs             show available codecs
    -decoders           show available decoders
    -encoders           show available encoders
    -bsfs               show available bit stream filters
    -protocols          show available protocols
    -filters            show available filters
    -pix_fmts           show available pixel formats
    -layouts            show standard channel layouts
    -sample_fmts        show available audio sample formats
    -colors             show available color names
    -opencl_bench       run benchmark on all OpenCL devices and show results
    -sources device     list sources of the input device
    -sinks device       list sinks of the output device
    -hwaccels           show available HW acceleration methods
     
    Global options (affect whole program instead of just one file:
    -loglevel loglevel  set logging level
    -v loglevel         set logging level
    -report             generate a report
    -max_alloc bytes    set maximum size of a single allocated block
    -opencl_options     set OpenCL environment options
    -y                  overwrite output files
    -n                  never overwrite output files
    -ignore_unknown     Ignore unknown stream types
    -filter_threads     number of non-complex filter threads
    -filter_complex_threads  number of threads for -filter_complex
    -stats              print progress report during encoding
    -max_error_rate ratio of errors (0.0: no errors, 1.0: 100% error  maximum error rate
    -bits_per_raw_sample number  set the number of bits per raw sample
    -vol volume         change audio volume (256=normal)
     
    Per-file main options:
    -f fmt              force format
    -c codec            codec name
    -codec codec        codec name
    -pre preset         preset name
    -map_metadata outfile[,metadata]:infile[,metadata]  set metadata information of outfile from infile
    -t duration         record or transcode "duration" seconds of audio/video
    -to time_stop       record or transcode stop time
    -fs limit_size      set the limit file size in bytes
    -ss time_off        set the start time offset
    -sseof time_off     set the start time offset relative to EOF
    -seek_timestamp     enable/disable seeking by timestamp with -ss
    -timestamp time     set the recording timestamp ('now' to set the current time)
    -metadata string=string  add metadata
    -program title=string:st=number...  add program with specified streams
    -target type        specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc-" or "film-")
    -apad               audio pad
    -frames number      set the number of frames to output
    -filter filter_graph  set stream filtergraph
    -filter_script filename  read stream filtergraph description from a file
    -reinit_filter      reinit filtergraph on input parameter changes
    -discard            discard
    -disposition        disposition
     
    Video options:
    -vframes number     set the number of video frames to output
    -r rate             set frame rate (Hz value, fraction or abbreviation)
    -s size             set frame size (WxH or abbreviation)
    -aspect aspect      set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
    -bits_per_raw_sample number  set the number of bits per raw sample
    -vn                 disable video
    -vcodec codec       force video codec ('copy' to copy stream)
    -timecode hh:mm:ss[:;.]ff  set initial TimeCode value.
    -pass n             select the pass number (1 to 3)
    -vf filter_graph    set video filters
    -ab bitrate         audio bitrate (please use -b:a)
    -b bitrate          video bitrate (please use -b:v)
    -dn                 disable data
     
    Audio options:
    -aframes number     set the number of audio frames to output
    -aq quality         set audio quality (codec-specific)
    -ar rate            set audio sampling rate (in Hz)
    -ac channels        set number of audio channels
    -an                 disable audio
    -acodec codec       force audio codec ('copy' to copy stream)
    -vol volume         change audio volume (256=normal)
    -af filter_graph    set audio filters
     
    Subtitle options:
    -s size             set frame size (WxH or abbreviation)
    -sn                 disable subtitle
    -scodec codec       force subtitle codec ('copy' to copy stream)
    -stag fourcc/tag    force subtitle tag/fourcc
    -fix_sub_duration   fix subtitles duration
    -canvas_size size   set canvas size (WxH or abbreviation)
    -spre preset        set the subtitle options to the indicated preset
    然后继续参考：
    如何快速的提取视频文件中的音频－Mac篇 – 简书
    的
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    ./ffmpeg -i DeadPoetsSocietyCD1.avi -ss 00:00:00.000 -to 00:02:00.000 -b:a 128k output.mp3
    先去看看对应参数含义
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    usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
     
    -ss time_off        set the start time offset
    -to time_stop       record or transcode stop time
     
    -ab bitrate         audio bitrate (please use -b:a)
    去试试
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    ➜  157712932 ll
    total 10192
    -rw-r--r--  1 crifan  staff   1.7K  9 26 15:28 show_157712932_info.json
    -rw-r--r--  1 crifan  staff   5.0M  9 26 15:27 show_157712932_video.mp4
    ➜  157712932 ffmpeg -i show_157712932_video.mp4 -ss 00:00:11.270 -to 00:00:14.550 -b:a 128k show_157712932_audio_000011270_000014550.mp3
    ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
      built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
      configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
      libavutil      55. 78.100 / 55. 78.100
      libavcodec     57.107.100 / 57.107.100
      libavformat    57. 83.100 / 57. 83.100
      libavdevice    57. 10.100 / 57. 10.100
      libavfilter     6.107.100 /  6.107.100
      libavresample   3.  7.  0 /  3.  7.  0
      libswscale      4.  8.100 /  4.  8.100
      libswresample   2.  9.100 /  2.  9.100
      libpostproc    54.  7.100 / 54.  7.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'show_157712932_video.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 0
        compatible_brands: isomiso2avc1
        creation_time   : 2018-09-25T14:26:33.000000Z
      Duration: 00:01:05.45, start: 0.000000, bitrate: 637 kb/s
        Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 573 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
        Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 60 kb/s (default)
        Metadata:
          creation_time   : 2018-09-25T14:26:33.000000Z
    Stream mapping:
      Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
    Press [q] to stop, [?] for help
    Output #0, mp3, to 'show_157712932_audio_000011270_000014550.mp3':
      Metadata:
        major_brand     : isom
        minor_version   : 0
        compatible_brands: isomiso2avc1
        TSSE            : Lavf57.83.100
        Stream #0:0(eng): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp, 128 kb/s (default)
        Metadata:
          creation_time   : 2018-09-25T14:26:33.000000Z
          encoder         : Lavc57.107.100 libmp3lame
    size=      52kB time=00:00:03.29 bitrate= 130.3kbits/s speed=36.6x
    video:0kB audio:52kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.053127%
    ➜  157712932 ll
    total 10304
    -rw-r--r--  1 crifan  staff    52K 10  4 10:35 show_157712932_audio_000011270_000014550.mp3
    -rw-r--r--  1 crifan  staff   1.7K  9 26 15:28 show_157712932_info.json
    -rw-r--r--  1 crifan  staff   5.0M  9 26 15:27 show_157712932_video.mp4
    ➜  157712932
    【总结】
    用
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    ffmpeg -i show_157712932_video.mp4 -ss 00:00:11.270 -to 00:00:14.550 -b:a 128k show_157712932_audio_000011270_000014550.mp3
    其中各个参数的含义是：
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    usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
     
    -ss time_off        set the start time offset
    -to time_stop       record or transcode stop time
     
    -ab bitrate         audio bitrate (please use -b:a)
    可以从mp4中提取出我们需要的mp3的：

    转载请注明：在路上 » 【已解决】Mac中用ffmpeg从mp4视频中提取mp3音频

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