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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
與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......
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
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
典型的MP4文件不是管道友好的。 – LordNeckbeard