2017-09-14 165 views
0

我的輸入是.mp4視頻文件。使用ffmpeg無法從視頻中提取mp3音頻

嘗試#1

ffmpeg -i pipe:0 -y -map a media/73.mp3 

錯誤:

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! 

嘗試#2

ffmpeg -i pipe:0 -y -vn -acodec copy media/72.mp3 

錯誤:

[...] 
[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 

嘗試#3

ffmpeg -i pipe:0 -y -codec:a libmp3lame -qscale:a 2 media/74.mp3 

ffmpeg沒有錯誤,但該文件是無效的(它的大小是334個字節)


嘗試#4

ffmpeg -i pipe:0 -y -vn -acodec mp3 media/78.mp3 

ffmpeg沒有錯誤,但該文件是invali d(它的大小是334個字節)


嘗試#5

ffmpeg -f mp4 -i pipe:0 -y media/80.mp3 

沒有錯誤與ffmpeg,但該文件是無效的(它的大小是334個字節)


什麼我做錯了嗎?這似乎是一個相當容易的事......

+1

你爲什麼想管MP4文件,而不是像一個正常的輸入使用它? 'ffmpeg -i input.mp4 output.mp3' – LordNeckbeard

+0

我使用'node-fluent-ffmpeg',我認爲它需要'ReadStream'。你是對的,直接指向輸入文件路徑按預期工作。我想知道爲什麼管道視頻不能正常工作,在管道上轉換音頻文件(例如wav到mp3)沒有問題。此外,我們可以看到,視頻是我發佈的第一條錯誤消息中的有效輸入。無論如何,感謝您的幫助。 – maximedupre

+0

典型的MP4文件不是管道友好的。 – LordNeckbeard

回答

1

嘗試此摘錄.mp3

ffmpeg -i video.mp4 -map 0:a -acodec libmp3lame out.mp3 

也許這個有用的提取物.m4a

ffmpeg -i video.mp4 -map 0:a -c copy out.m4a