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【已解决】用ffmpeg从mp4视频中提取出整个mp3以及根据时间段去分割mp3

视频 crifan 187浏览 0评论
折腾:
【无需解决】Python中用库分割mp3
后,还是打算去试试:
先搞清楚如何从ffmpeg提取出整个mp3
再去搞清楚如何传入时间段,从mp3分割出对应片段
如何快速的提取视频文件中的音频-Mac篇 – 简书
./ffmpeg -i DeadPoetsSocietyCD1.avi -b:a 128k DeadPoetsSociety.mp3
不指定起始和结束时间,就可以提取整个完整的mp3了。
➜  splitAudio git:(master) ffmpeg -i show_14322648_video.mp4 -b:a 128k show_14322648_audio.mp3
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree
  libavutil      56. 14.100 / 56. 14.100
  libavcodec     58. 18.100 / 58. 18.100
  libavformat    58. 12.100 / 58. 12.100
  libavdevice    58.  3.100 / 58.  3.100
  libavfilter     7. 16.100 /  7. 16.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  1.100 /  5.  1.100
  libswresample   3.  1.100 /  3.  1.100
  libpostproc    55.  1.100 / 55.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'show_14322648_video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isomiso2avc1
    creation_time   : 2016-08-30T00:39:54.000000Z
  Duration: 00:00:48.22, start: 0.000000, bitrate: 616 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 552kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 61 kb/s (default)
    Metadata:
      creation_time   : 2016-08-30T00:39:54.000000Z
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'show_14322648_audio.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isomiso2avc1
    TSSE            : Lavf58.12.100
    Stream #0:0(eng): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2016-08-30T00:39:54.000000Z
      encoder         : Lavc58.18.100 libmp3lame
size=     755kB time=00:00:48.24 bitrate= 128.2kbits/s speed=  46x
video:0kB audio:754kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.072373%
➜  splitAudio git:(master)
即可得到mp3:
然后再去找找,能否用ffmpeg从mp3,指定起始和结束时间,分割出mp3片段
ffmpeg split mp3
ffmpeg – How do I split an audio file into multiple? – Unix & Linux Stack Exchange
windows – Splitting an audio file into chunks of a specified length – Super User
bash – ffmpeg recursive folder check and file split to subfolder – Unix & Linux Stack Exchange
Split mp3 file with ffmpeg – dtbaker.net
https://dtbaker.net/blog/random-linux-posts/2011/10/split-mp3-file-with-ffmpeg/
How to Split MP3 Files with FFmpeg
issue with ffmpeg split mp3 file into ts file(s) – Stack Overflow
Splitting Audio with ffmpeg – Stochastic Nonsense
ffmpeg – Trim audio file using start and stop times – Unix & Linux Stack Exchange
目前都是分割出单个的mp3的,没法批量
如果批量,目前看到的只能是:每个Segment是固定的时间长度,而不是可以每个的起始和时间可以批量指定
去找找ffmpeg官网,看看是否支持我所希望的如此高级的用法
看到前面从mp3提取出mp3,都是用的是:
-acodec copy
而看到:
ffmpeg Documentation
解释了:
“3.2 Stream copy
Stream copy is a mode selected by supplying the copy parameter to the -codec option. It makes ffmpeg omit the decoding and encoding step for the specified stream, so it does only demuxing and muxing. It is useful for changing the container format or modifying container-level metadata.”
-》看起来,不需要额外再次编码和解码,则按道理会比之前每次从mp4中提取出mp3片段,速度要快
“An empty stream specifier matches all streams. For example, -codec copy or -codec: copy would copy all the streams without reencoding.”
几个相关参数:
https://www.ffmpeg.org/ffmpeg-all.html#toc-Main-options
“-t duration (input/output)
When used as an input option (before -i), limit the duration of data read from the input file.
When used as an output option (before an output url), stop writing the output after its duration reaches duration.
duration must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual.
-to and -t are mutually exclusive and -t has priority.
-to position (input/output)
Stop writing the output or reading the input at position. position must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual.
-to and -t are mutually exclusive and -t has priority.
-ss position (input/output)
When used as an input option (before -i), seeks in this input file to position. Note that in most formats it is not possible to seek exactly, so ffmpeg will seek to the closest seek point before position. When transcoding and -accurate_seek is enabled (the default), this extra segment between the seek point and position will be decoded and discarded. When doing stream copy or when -noaccurate_seek is used, it will be preserved.
When used as an output option (before an output url), decodes but discards input until the timestamps reach position.
position must be a time duration specification, see (ffmpeg-utils)the Time duration section in the ffmpeg-utils(1) manual.”
那就去试试吧
ffmpeg -i show_14322648_audio.mp3 -acodec copy -ss 00:00:03.110 -to 00:00:06.110 show_14322648_audio_000003110_000006110.mp3

ffmpeg -i show_14322648_audio.mp3 -c copy -ss 00:00:03.110 -to 00:00:06.110 show_14322648_audio_000003110_000006110_cCopy.mp3
输出:
➜  splitAudio git:(master) ffmpeg -i show_14322648_audio.mp3 -c copy -ss 00:00:03.110 -to 00:00:06.110 show_14322648_audio_000003110_000006110_cCopy.mp3
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-nonfree
  libavutil      56. 14.100 / 56. 14.100
  libavcodec     58. 18.100 / 58. 18.100
  libavformat    58. 12.100 / 58. 12.100
  libavdevice    58.  3.100 / 58.  3.100
  libavfilter     7. 16.100 /  7. 16.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  1.100 /  5.  1.100
  libswresample   3.  1.100 /  3.  1.100
  libpostproc    55.  1.100 / 55.  1.100
Input #0, mp3, from 'show_14322648_audio.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isomiso2avc1
    encoder         : Lavf58.12.100
  Duration: 00:00:48.27, start: 0.025057, bitrate: 128 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.18
Output #0, mp3, to 'show_14322648_audio_000003110_000006110_cCopy.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isomiso2avc1
    TSSE            : Lavf58.12.100
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.18
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=      47kB time=00:00:02.97 bitrate= 129.5kbits/s speed=1.76e+03x
video:0kB audio:47kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.173211%
➜  splitAudio git:(master)
【总结】
此处:
(1)从mp4中提取整个mp3
ffmpeg -i show_14322648_video.mp4 -b:a 128k show_14322648_audio.mp3
(2)从mp3中提取某个时间段的mp3
ffmpeg -i show_14322648_audio.mp3 -acodec copy -ss 00:00:03.110 -to 00:00:06.110 show_14322648_audio_000003110_000006110.mp3
其中:
-acodec copy
 可以简写为:
-c copy
变成:
ffmpeg -i show_14322648_audio.mp3 -c copy -ss 00:00:03.110 -to 00:00:06.110 show_14322648_audio_000003110_000006110_cCopy.mp3

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