Extract audio from mp4

Fixit7 · 02-13-2016, 09:53 PM

Trying to extract audio from mp4.

It does not play.

Does mplayer not work on all mp4s ?

Quote:

# mplayer -dumpaudio -dumpfile RhinestoneCowboy.mp3 Rhinestone_Cowboy.mp4
MPlayer 1.1-4.8.2 (C) 2000-2012 MPlayer Team

Playing Rhinestone_Cowboy.mp4.
libavformat version 54.6.100 (internal)
libavformat file format detected.
[lavf] stream 0: video (vp8), -vid 0
[lavf] stream 1: audio (vorbis), -aid 0
VIDEO: [VP80] 640x360 0bpp 1000.000 fps 0.0 kbps ( 0.0 kbyte/s)
dump: 3151167 bytes written to 'RhinestoneCowboy.mp3'.
Core dumped

Exiting... (End of file)

malekmustaq · 02-14-2016, 12:35 AM

To extract audio in mp3 format from a video mp4:

Code:

ffmpeg -i yourvideofile.flv -acodec copy youraudiofile.mp3

You need to install ffmpeg first.
Mplayer plays audio and video, if your doesn't something is wrong with either the file or the configuration.

Hope that helps. Goodluck.

pan64 · 02-14-2016, 02:41 AM

core dumped means something went wrong. So I do not expect usable result.
From the other hand you may try to use the tool Super (which works on windows, and it has a gui to select/click what you want.)

Emerson · 02-14-2016, 07:13 AM

I think core dumped is a mplayer joke. Source has vorbis audio, giving it mp3 extension won't do much good.

Fixit7 · 02-14-2016, 07:16 AM

ffmpeg does not work either.

Quote:

# ffmpeg -i Rhinestone_Cowboy.mp4 -acodec copy Rhinestone.mp3
ffmpeg version 2.2.16 Copyright (c) 2000-2015 the FFmpeg developers
built on Oct 8 2015 14:32:29 with gcc 4.8.2 (GCC)
configuration: --prefix=/usr --libdir=/usr/lib --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-pthreads --enable-small --enable-postproc --enable-libvorbis --enable-gpl --enable-shared --enable-nonfree --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-debug --enable-bzlib --enable-zlib --enable-libspeex --enable-version3 --enable-runtime-cpudetect --enable-x11grab --enable-libschroedinger --enable-libtheora --enable-libxvid --enable-swscale --enable-libvpx
libavutil 52. 66.100 / 52. 66.100
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 33.100 / 55. 33.100
libavdevice 55. 10.100 / 55. 10.100
libavfilter 4. 2.100 / 4. 2.100
libswscale 2. 5.102 / 2. 5.102
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, matroska,webm, from 'Rhinestone_Cowboy.mp4':
Metadata:
encoder : Google
Duration: 00:03:26.76, start: 0.000000, bitrate: 705 kb/s
Stream #0:0: Video: vp8, yuv420p, 640x360, SAR 1:1 DAR 16:9, 1k fps, 29.97 tbr, 1k tbn, 1k tbc (default)
Stream #0:1: Audio: vorbis, 44100 Hz, stereo, fltp (default)
[mp3 @ 0x975a500] Invalid audio stream. Exactly one MP3 audio stream is required.
Output #0, mp3, to 'Rhinestone.mp3':
Metadata:
encoder : Lavf55.33.100
Stream #0:0: Audio: vorbis, 44100 Hz, stereo (default)
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Conversion failed!

unSpawn · 02-14-2016, 08:02 AM

Install mediainfo and give us 'mediainfo Rhinestone_Cowboy.mp4;' output?

Emerson · 02-14-2016, 09:24 AM

OP is interested in audio, both mplayer and ffmpeg tell us it is vorbis, it needs to be recoded if OP wants mp3. What is the output of

Code:

file RhinestoneCowboy.mp3

(The RhinestoneCowboy.mp3 from initial post.)

Fixit7 · 02-14-2016, 08:40 PM

file output.

Quote:

# file RhinestoneCowboy.mp3
RhinestoneCowboy.mp3: data

Fixit7 · 02-14-2016, 08:46 PM

Quote:

Originally Posted by unSpawn

Install mediainfo and give us 'mediainfo Rhinestone_Cowboy.mp4;' output?

I can't find a mediainfo package for Slacko.

Fixit7 · 02-16-2016, 07:55 PM

I had to go to Windows to do the conversion.

http://www.mp4-mp3.org/mp4-to-mp3.html

Emerson · 02-16-2016, 08:13 PM

That's crazy. Please do me a favor, I'm curious now. Please download this file and run file utility on it. What does it tell?

Code:

file 01.mp3

Fixit7 · 02-16-2016, 08:21 PM

Here is the output.

Quote:

01.mp3: Ogg data, Vorbis audio, stereo, 44100 Hz, ~128000 bps, created by: Xiph.Org libVorbis I (1.1.0 RC1)
audacity-2.1-slacko_5.6.sfs: Squashfs filesystem, little endian, version 4.0, 30452682 bytes, 250 inodes, blocksize: 131072 bytes, created: Sun Dec 28 03:42:33

Emerson · 02-16-2016, 08:26 PM

Beats me. Your command was correct with one minor discrepancy - the extension should have been ogg, not mp3.

Code:

mplayer -dumpaudio -dumpfile RhinestoneCowboy.ogg Rhinestone_Cowboy.mp4

Fixit7 · 02-16-2016, 09:24 PM

According to here, it can extract mp3s too.

http://www.cyberciti.biz/faq/linux-u...online-stream/

Emerson · 02-16-2016, 09:46 PM

Yes it can extract mp3, but if the source is vorbis then to get mp3 you need not only to extract but also convert, mplayer -dumpaudio extracts only. So your output was supposed to be an ogg file, not sure how mplayer managed to screw it up because of incorrect extension you gave to it, generally Linux applications do not care about extensions, maybe mplayer is an exception.