Join many MP3, OGG, and FLAC files into one WAV or FLAC
Solution 1
You can do this with ffmpeg
and sox
:
for i in *.mp3 *.ogg *.flac
do
ffmpeg -i "$i" "$i.wav"
done
sox *.wav combined.wav
Solution 2
Assuming you want to merge them alphabetically, by filename:
for f in ./*.{ogg,flac,mp3}; do echo "file '$f'" >> inputs.txt; done
ffmpeg -f concat -i inputs.txt output.wav
The for loop puts all the filenames in a file called inputs.txt, one-per-line, and the second one uses ffmpeg's concat demuxer to merge the files. It is possible to use printf instead of the loop like so:
printf "file '%s'\n" ./*.{ogg,flac,mp3} > inputs.txt
Assuming a modern shell, you can also use command substitution to do the whole thing in a single line.
ffmpeg -f concat -i <(printf "file '%s'\n" ./*.{ogg,flac,mp3}) output.wav
Solution 3
If you start with only lossless files, you can use use shntool:
shntool join *.flac
Solution 4
It seems that the Sound Juicer that comes with Ubuntu writes broken FLAC files, which result in no MD5 signature in the file. MAKE A COPY of the directory containing the files you want to concatenate, then run the script below.
echo fixing broken FLAC files
find . -type f|grep .flac$ |while read file
do
flac -f --decode "$file" -o temp.wav
flac -f -8 temp.wav -o "$file"
done
rm temp.wav
Then runshntool join *.flac
as above.
Solution 5
However, be aware that the shntool join will insist on joining them in collating sequence (alphabetical) order EVEN IF you specify them otherwise.
shntool join fileB.flac fileA.flac
will put A before B.
You can either rename the files first or use the -r parameter ("-r ask" will prompt for the order).
Frankly I find this irritating...
Also you can force the output mode, so if you're joining FLACs:
shntool join *.flac -o flac
will result in joined.flac rather than joined.wav
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ashastral
Updated on September 17, 2022Comments
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ashastral over 1 year
I have 33 audio files, each about 11 seconds long, and I'd like to merge them into one lossless file. How can I do this efficiently (i.e. without cut-pasting in Audacity 33 times)?
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ashastral almost 14 yearsThis worked perfectly! Thank you for the help.
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Andrew Burns over 10 yearsI believe this is the 'correct' ffmepg answer as it will not re-encode anything.
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Display Name over 9 yearsDoes not work if a file name contains
'
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Display Name over 9 years^ I'm talking about 1st command, didn't try other two yet.
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The Onin about 6 years
sox
doesn't work for OGG:/usr/local/Cellar/sox/14.4.2_1/bin/sox FAIL formats: no handler for detected file type 'opus'
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bonh over 4 yearsI get this error:
shntool [join]: warning: unsupported format 0xfffe (Unknown) while processing file: [file1.flac]
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Peter about 4 yearsI get an error when I attempt the one-liner, but this works for me:
ffmpeg -f concat -safe 0 -i <(for f in ./*.flac; do echo "file '$PWD/$f'"; done) output.flac