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I have a directory with a bunch of CD quality (16bit 44100Hz) wave-files.

How can I batch decode those into different formats (lets say FLAC, OGG and MP3) using ffmpeg?

Update: here are the commands one by one as suggested by @StephenHarris

ffmpeg -i input.wav output.ogg
ffmpeg -i input.wav output.mp3
ffmpeg -i input.wav output.flac
nath
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    Take it step by step. How would you convert _one_ file? If you can work out how to convert one wav file into flac, into ogg, into mp3 (3 separate commands) then we can add a loop around it. So "what command would you use to convert wav to flac?" "what command would convert wav to ogg?" "What command would convert wav to mp3?" – Stephen Harris Dec 10 '18 at 00:56
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    @StephenHarris, thanks, just working it out :-) – nath Dec 10 '18 at 00:58
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    @StephenHarris done :-))) – nath Dec 10 '18 at 01:37

2 Answers2

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ffmpeg accepts multiple output formats. Set the input file.format with -i followed by the output file.format: ffmpeg -i input.wav output.ogg output.mp3 output.flac

Batch conversion:

As a simple one liner with putting each format in a separate folder:

mkdir mp3 ogg flac; for i in *.wav; do ffmpeg -i "$i" -b:a 320000 "./mp3/${i%.*}.mp3" -b:a 320000 "./ogg/${i%.*}.ogg" "./flac/${i%.*}.flac"; done

Decode all into one folder:

for i in *.wav; do ffmpeg -i "$i" -b:a 320000 "${i%.*}.mp3" -b:a 320000 "${i%.*}.ogg" "${i%.*}.flac"; done

-b:a 320000 sets the bitrate for the decoding of mp3 and ogg and can be adjusted (the bitrate is measured in bits/sec so 320kbit/s equals 320000).

thanks to https://stackoverflow.com/a/33766147 for the parameter-expansion

nath
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3

Using GNU Parallel you can run:

parallel ffmpeg -i {1} {1.}.{2} ::: *.wav ::: ogg mp3 flac

{1} = replacement string for first input source
{1.} = replacement string for first input source with extension removed
{2} = replacement string for second input source
::: *.wav = input source 1
::: ogg mp3 flac = input source 2

This will use all your cores.

Ole Tange
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