在python上使用ffmpeg将mkv转换为mp3时出现“不支持的输入采样率设置"错误 [英] 'unsupported input sample rate set' error while converting mkv to mp3 with ffmpeg on python

问题描述

我在尝试通过python将某些mkv文件转换为mp3时遇到此错误.几乎所有文件都已转换，但是有些文件正面临此问题.
https://cdn.discordapp.com/attachments/663255565451001001866/788424224661569596/错误.txt

I'm getting this error on trying to convert some mkv files to mp3 via python. Nearly all files got converted, but some are facing this issue.
https://cdn.discordapp.com/attachments/663255565451001866/788424224661569596/Error.txt

请帮助我解决此问题.

ffmpeg输出:

ffmpeg version git-2020-06-04-7f81785 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 49.100 / 56. 49.100
  libavcodec     58. 90.100 / 58. 90.100
  libavformat    58. 44.100 / 58. 44.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 84.100 /  7. 84.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, matroska,webm, from 'J:\DC ED\Original\045 'Kimi no Egao ga Nani Yori mo Suki Datta' by 'Chicago Poodle'.mkv':
  Metadata:
    title           : 045 'Kimi no Egao ga Nani Yori mo Suki Datta' by 'Chicago Poodle'.mkv
    COPYRIGHT       : © 2013 APTX4869 Fansub
    creation_time   : 2020-11-18T05:03:06.000000Z
    COMPOSER        : Chicago Poodle
    ENCODER         : Lavf58.44.100
  Duration: 00:01:20.04, start: 0.000000, bitrate: 2023 kb/s
    Stream #0:0(jpn): Video: hevc (Main), yuv420p(tv), 1440x1080 [SAR 4:3 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
    Metadata:
      title           : VIDEO[AVC]
      ENCODER         : Lavc58.90.100 libx265
      BPS-eng         : 1831510
      DURATION-eng    : 00:01:20.039000000
      NUMBER_OF_FRAMES-eng: 1919
      NUMBER_OF_BYTES-eng: 18324032
      _STATISTICS_WRITING_APP-eng: mkvmerge v49.0.0 ('Sick Of Losing Soulmates') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-11-18 05:03:06
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(jpn): Audio: aac (LC), 96000 Hz, stereo, fltp (default)
    Metadata:
      title           : AUDIO[AAC]
      BPS-eng         : 188626
      DURATION-eng    : 00:01:19.999000000
      NUMBER_OF_FRAMES-eng: 3750
      NUMBER_OF_BYTES-eng: 1886246
      _STATISTICS_WRITING_APP-eng: mkvmerge v49.0.0 ('Sick Of Losing Soulmates') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-11-18 05:03:06
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> mp3 (mp3_mf))
Press [q] to stop, [?] for help
[mp3_mf @ 000002142f4a5fc0] MFT name: 'MP3 Encoder ACM Wrapper MFT'
[mp3_mf @ 000002142f4a5fc0] unsupported input sample rate set
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

推荐答案

您正在使用MediaFoundation MP3编码器 mp3_mf .好像是一个挑剔的，麻烦的编码器.即使添加 -ar 48000 ，它仍然可能会失败，并显示错误 nb_samples(1024)！= frame_size(0).

You are using the encoder mp3_mf which is the MediaFoundation MP3 encoder. Seems like a picky, troublesome encoder. Even if you add -ar 48000 it may still fail with the error nb_samples (1024) != frame_size (0).

要修复此问题，请使用其他MP3编码器.使用输出选项 -c:a libmp3lame (而不是 -c:a mp3_mf (如果使用的话).

To fix it use a different MP3 encoder. Use the output option -c:a libmp3lame (instead of -c:a mp3_mf if you used that).

ffmpeg -i input.mkv -c:a libmp3lame output.mp3

libmp3lame 将自动选择适当的采样率，因此无需添加 -ar .

libmp3lame will automatically choose the appropriate sample rate, so no need to add -ar.

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