How do I convert an MP4 to an MP3?

  • I have some songs which are in mp4 format and I want to convert them into mp3 format.

    I am new to Ubuntu/Linux. So please explain the step by step process or give any software which can do the above job.

    @GrSr - Judging from the context, I believe srinu is asking about MP4 audio files (typically M4A extension).

    @reverendj1 yeah but look at the answers provided .

  • reverendj1

    reverendj1 Correct answer

    8 years ago

    I would recommend Sound Converter. It is extremely simple to use for what you want. You can find it in the Software Center, or install it from the terminal:

    sudo apt-get install soundconverter
    

    Ubuntu Repo: soundconverter
    Apt Link: Install soundconverter

    All you need to do is open it up, change your preferences (Edit -> Preferences) then click the "Add File" or "Add Folder" buttons to add the music to be converted, and click Convert. It doesn't get much simpler.

    Thanks, I tried transcoding some large .mp4 files from youtube into CBR MP3 files and I love how soundconverter utilized all four of my CPU cores out of the box.

    On a relatively fresh install of Ubuntu 15.10, this crashes almost every time I hit the convert button. Shame, seemed like a good program otherwise.

    perfect for mp4->mp3 conversion

    To enable conversion from mp4 to mp3 in ubuntu 16, I had to do sudo apt-get install ubuntu-restricted-extras

    ubuntu 17. no mp3 converter!

    There is SoundConverter for Ubuntu 18.04, nice!

  • I have extracted the audio from mp4 and m4a files and converted them to mp3 format many times; it is very useful when a lot of podcasts come in m4a or mp4 format.

    I found that the most reliable way to allow ffmpeg to use proprietary formats was to build it from source, although you can see if it works with jfreak53's method if you do not wish to build from source. (After uninstalling any ffmpeg files, I compiled ffmpeg from source using this guide)

    In addition, the following script, which I have modified, (credit to the original creator), preserves the original name of the file in the newly converted file, which may be useful for you. Save it in a text editor and make it executable with chmod +x yourscriptname.

    #!/bin/bash
    for f in *.mp4
    do
        name=`echo "$f" | sed -e "s/.mp4$//g"`
        ffmpeg -i "$f" -vn -ar 44100 -ac 2 -ab 192k -f mp3 "$name.mp3"
    done
    

    In addition, following a suggestion by evilsoup, you could also use the following one-liner. It 'converts every MP4 in the current directory to an MP3', preserves the original name of the file, and 'to use it for an flv or avi or whatever, simply change both instances of mp4':

    for f in *.mp4; do ffmpeg -i "$f" -vn -c:a libmp3lame -ar 44100 -ac 2 -ab 192k "${f/%mp4/mp3}"; done
    

    @evilsoup I've incorporated your suggestion.

    Ubuntu does not ship ffmpeg so you can install libav's avconv. Just install package libav-tools with apt-get and use avconv instead of ffmpeg Works great, thanks!

    The `-ab` option does not exist, according to the documentation. Additionally, it’s not necessary to change the bitrate and especially not the sampling rate, nor to specify a codec, so the following line is completely sufficient (and the shell replacement part a bit more safe): `for x in *.mp4; do ffmpeg -i "$x" -vn -f mp3 ./"${x%.mp4}.mp3"; done` — the `./` before the output filename is especially needed for videos from `youtube-dl` whose names can begin with a hyphen-minus and thus will cause errors with the other command lines.

  • If you mean export the audio from the video MP4 file then use ffmpeg, I do this all the time from FLV files. Firstly install ffmpeg:

    sudo apt-get install ffmpeg libavcodec-unstripped-52
    

    The run:

    ffmpeg -i video.mp4 -f mp3 -ab 192000 -vn music.mp3
    

    It might say that your missing some codecs for MP4, in that case just run:

    aptitude search codecname
    

    And find it to install.

    By the way, you can get more information about this by searching the web. Here are a few useful resources, found in this way:

    Does this re-encode the audio, thus reducing quality? Or is there a way to do this losslessly? Edit: Nevermind, found out how and posted an answer below.

  • Here's how to extract the audio from an MP4 video losslessly (keeping the original sound intact without reducing quality)

    ffmpeg -i video.mp4 -vn -acodec copy audio.m4a
    

    Granted, this results in an M4A audio file not MP3. But most software and cell phones now can play M4A out of the box.

    You can't stream those though (`ssh server cat file.m4a | mplayer -` errors out). I found out that you _can_ stream them using the right container format, at no quality loss either: `for x in *.mp4; do ffmpeg -i "$x" -vn -sn -c:a copy ./"${x%.mp4}.wma"; done` (see my comment above for why the `./`). Do note that the original question **did** ask about conversion to MP3, which *does* include re-encoding and, thus, loss of quality.

  • http://www.iasptk.com/ff-multi-converter-is-a-simple-graphical-application-which-enables-you-to-convert-audio-video-image-and-document-files-between-all-popular-formats

    FF Multi Converter is a simple graphical application which enables you to convert audio, video, image and document files between all popular formats, using and combining other programs. It uses ffmpeg for audio/video files, unoconv for document files and PythonMagick library for image file conversions.

    The goal of FF Multi Converter is to gather all multimedia types in one application and provide conversions for them easily through a user-friendly interface. Extra options will be gradually added.

    The application is written in python and PyQt.

    All code is licensed under the GNU General Public License.

    FF Multi Converter is free software - software that respects your freedom.

    Features

    Conversions for several file formats.

    Very easy to use interface.

    Access to common conversion options.

    Options for saving and naming files.

    Recursive conversions.

    Installing on Ubuntu and Debian

    Stable release

    To add the ppa to your system resources and install ffmulticonverter, open a terminal and enter:

    sudo add-apt-repository ppa:ffmulticonverter/stable
    
    sudo apt-get update
    
    sudo apt-get install ffmulticonverter
    

    Development release

    Just change ppa name to ppa:ffmulticonverter/unstable and type the same commands as above.

  • Whether you mean video or audio, Audacity works great (it can extract audio from any supported video file). I use it now. I used to use ffmpeg, but it was a little complicated and some formats weren't available/didn't work.

    Wait, I meant Winff, a GUI frontend for ffmpeg.

  • I would recommend Winff a GUI for ffmpeg for all video/audio conversions.
    All you do is add the video, choose your output (audio, mp3) in this case, choose the folder the converted file is to be saved in and click convert.

    sudo apt-get install winff

  • Combining things here, but this keeps file names and dumps a original sound copy to m4a:

    for f in *.mp4; do name=`echo "$f" | sed -e "s/.mp4$//g"` && ffmpeg -i "$f" -vn -acodec copy "$name.m4a"; done
    

License under CC-BY-SA with attribution


Content dated before 6/26/2020 9:53 AM