我的输入是一个 .mp4 视频文件。
尝试#1
ffmpeg -i pipe:0 -y -map a media/73.mp3
错误:
ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 8.1.0 (clang-802.0.42)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma --enable-vda
libavutil 55. 58.100 / 55. 58.100
libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100
libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100
libavresample 3. 5. 0 / 3. 5. 0
libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100
libpostproc 54. 5.100 / 54. 5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f977d800000] stream 1, offset 0xa8: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f977d800000] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none(smpte170m/smpte170m/bt709), 320x176, 300 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
creation_time : 2012-03-13T08:58:06.000000Z
encoder : HandBrake 0.9.6 2012022800
Duration: 00:00:10.03, bitrate: N/A
Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none(smpte170m/smpte170m/bt709), 320x176, 300 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2012-03-13T08:58:06.000000Z
encoder : JVT/AVC Coding
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
Metadata:
creation_time : 2012-03-13T08:58:06.000000Z
Stream #0:2(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s
Metadata:
creation_time : 2012-03-13T08:58:06.000000Z
Stream #0:3(und): Subtitle: mov_text (text / 0x74786574), 0 kb/s
Metadata:
creation_time : 2012-03-13T08:58:06.000000Z
Stream mapping:
Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Stream #0:2 -> #0:1 (aac (native) -> mp3 (libmp3lame))
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f977d800000] stream 1, offset 0xa8: partial file
pipe:0: Invalid data found when processing input
Finishing stream 0:0 without any data written to it.
Finishing stream 0:1 without any data written to it.
[mp3 @ 0x7f977b846800] Invalid audio stream. Exactly one MP3 audio stream is required.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:1 --
Conversion failed!
尝试 #2
ffmpeg -i pipe:0 -y -vn -acodec copy media/72.mp3
错误:
[...]
[mp3 @ 0x7febed835200] Invalid audio stream. Exactly one MP3 audio stream is required.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
尝试#3
ffmpeg -i pipe:0 -y -codec:a libmp3lame -qscale:a 2 media/74.mp3
ffmpeg 没有错误，但文件无效(大小为 334 字节)
尝试#4
ffmpeg -i pipe:0 -y -vn -acodec mp3 media/78.mp3
ffmpeg 没有错误，但文件无效(大小为 334 字节)
尝试#5
ffmpeg -f mp4 -i pipe:0 -y media/80.mp3
ffmpeg 没有错误，但文件无效(大小为 334 字节)
我做错了什么？这似乎是一件相当容易的事情......
最佳答案
尝试提取 .mp3:
ffmpeg -i video.mp4 -map 0:a -acodec libmp3lame out.mp3
也许这对提取 .m4a 有用:
ffmpeg -i video.mp4 -map 0:a -c copy out.m4a
关于video - 无法使用ffmpeg从视频中提取mp3音频，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46209534/