How can I split a mp3 file?

Question

I have a big mp3 file which comes from ripping a full CD. I would like to split it into one file per song. It will be great to find a software that can split the file automatically, detecting the start and the end of each song.

Extra background:

I have tried mp3splt and audacity. The first one fails to autodetect the songs and audacity seems to be unable to do it.

I would like to burn the songs to a CD (mp3 format) to play then in my car radio. It will not support any fancy stuff, it doesn't even have an USB connector.

Answer 1

Audacity is BAD for that - since it re-encodes mp3 and the quality gets downgraded. I use ffmpeg for cutting mp3 - I believe it doesn't do re-encoding:

# start time to end time:
ffmpeg -i input.mp3 -vn -acodec copy -ss 00:00:00 -to 00:01:32 output.mp3

# start time + duration time:
ffmpeg -i input.mp3 -vn -acodec copy -ss 00:00:00 -t 00:01:32 output.mp3

# start of record till end time:
ffmpeg -i input.mp3 -vn -acodec copy -to 00:01:32 output.mp3

# start time till end of record:
ffmpeg -i input.mp3 -vn -acodec copy -ss 00:01:32 output.mp3

one can also include milliseconds with e.g. 00:00:00.000.

Answer 2

You say you've tried mp3splt but have you read the full manpage?

I ask because the -s silence mode can take parameters to help it determine silence.

Here a man page example with optional parameters:

mp3splt -s -p th=-50,nt=10 album.mp3

• th: threshold level (dB) to be considered silence
• nt number of tracks

There's also a -c CDDB database query mode. If this is a known CD, you can pull the track listing from online. This will also name tracks correctly and (I think) it'll even set the tags up.

It is an incredibly powerful tool and one of your best options for preserving quality... So don't write it off straight away.

Answer 3

Audacity

You can split your large mp3 into small pieces by using the "split" or "split new" function in audacity, then can move apart the portion of audio that you wish to mix down into a different file in order to export it.

In the next screenshot, I have made a new Stereo Track in order to put the split audio into a different track (for visual purposes only), then I moved the second part of the audio to that track and I have selected a portion of audio which can be exported into a new file.

You don't have to split the audio in order to export the portion of audio into a different file, you can simply select the audio and choose "Export Selection" in the File Menu.

In the next screenshot I am doing as I said in the words above.

Sound Juicer

If you yet have the CD, ripping audio with a file per song can be done by using "Sound Juicer", which will allow you to choose how to rip the media from the CD. This way you will have an mp3 file per song. And the task to mix down all the songs into a large file will be easily achieved by Audacity, just in case you need to do it so.

Sound Juicer can be installed via synaptic or by diving into the website at: http://burtonini.com/blog/computers/sound-juicer

A screenshot are placed here in order to you see Sound Juicer in action. (Sorry, I don't have a CD to rip off right now, so the playlist is empty)

Answer 4

you can try something like:

ffmpeg -i /path/music.mp3 -t 00:10:00 -ss 00:20:00 -acodec copy /path/save.mp3

Answer 5

I can recommend mp3DirectCut. Does lossless conversion and runs fine under Wine:

Answer 6

The following answer on stack overflow is probably relevant. Summarizing this answer, you can use ffmpeg to identify silent regions:

ffmpeg -i "input.mov" -af silencedetect=noise=-30dB,d=0.5 -f null - 2> vol.txt

And then split up the files using Adobe's recipe:

ffmpeg -i InputFile -vn -acodec copy -ss 00:00:00 -t 00:01:32 OutputFile

This will require a little parsing on your part.

Answer 7

mp3splt works well. How well depends on what you have to start with and what you expect for results. More inputs = more outputs. If you know the number of songs contained in the large mp3 files, this helps to tell you the number of output files is correct. You MUST have silence sections between your songs in the large mp3 file. The key for mp3splt is to find the correct value for "th". If "th" is too low, you may have too many outputs, so all your songs are fragmented. If too high, your songs will not be split, and you may may have more than 1 song per split. Let's assume you have a large file and nothing else: eg no index for titles or times.

My large file is named "artist.ogg" Here is the command I used:

mp3splt -s -p th=-40 artist.ogg

This resulted in 34 songs split correctly, each named serially as artist_silence_01.ogg -xx.ogg etc.

Again, if you have too many splits, try "th=-48". If too few, try "th=-36".

From these output files, you will need now to rename them into the song titles you want and add labels to the file properties. [I know of no macro for this, so must be a manual process].

hope this helps.

update PS. So far, mp3splt works for mp3 and ogg files. I have no success yet for m4a files.

Answer 8

I got quality results (though not completely automatic) with Audacity + mp3splt.

If you don't have a .cueor a .cddb file with song limits (e.g., it is not a recognized album), you can:

1. Manually label the track in Audacity as explained in its manual, probably helped by previous silence autodetection (with Analyze > Silence Finder…, see here) for a first guess at notorious breaks
2. Export the labels (with File > Export Labels…, see here) to a simple text file, and
3. Feed the .txt file to mp3splt under option -A (as mp3splt -A labels.txt Album.mp3).

It will quickly (no decoding + re-encoding) output a file for each segment using each label name as filename.

Just be careful to use region labels (and not point labels, see here) to mark the beginning and end of each song in Audacity.

Answer 9

If you need just an easy to use and lossless (not like Audacity for instance) graphical tool for splitting audio files (mp3 and wav), try wavbreaker (https://wavbreaker.sourceforge.io/) installable usually with a simple:

sudo apt install wavbreaker

or

sudo yum install wavbreaker

depending on your linux distribution.

.... or also

flatpak install wavbreaker

if you really want to check last version on your distro and you have flatpak support installed.