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Tag: MP3

Dumping a bunch of MP3s as WAV files

December 6, 2009 /

I just used the following command for converting a directory with a bunch of MP3s to WAV. Does someone know a command that is shorter? I find mine a bit convoluted to say the least.

mkdir wav
ls *mp3|while i;  mpg123 --stdout "$i" > wav/ $i|sed -r -e 's/^([0-9]+) .*$/\1/'`.wav;

The directory looks like this:

$ ls -1
01 - Meant to Be.mp3
02 - Reflections.mp3
03 - Semester Days.mp3
04 - Friend.mp3
05 - True Gemini.mp3
06 - Down the Road.mp3
07 - Tulip Trees.mp3
08 - Not Alone.mp3
09 - Woods of Chaos.mp3
10 - Twilight.mp3
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License.txt
Rob Costlow - Solo Piano - Woods of Chaos.1.0.jpg

Extracting the MP3 stream from a Flash Video (flv) file

March 10, 2009 /

I wanted to convert an Flash Video (flv) file from YouTube to MP3. The first tip I found essentially streamed the original file into a different file:

ffmpeg -i filename.flv -acodec mp3 -ac 2 -ab 128 -vn -y filename.mp3

This is a bit awkward, because not all flv files have the same quality (some are mono, for example). I don’t want to have to look up the number of channels (-ac 2 in the example) for each file that I need to convert.

Luckily, most flv files include an MP3 audio stream and ffmpeg can simply copy that stream to a new file:

ffmpeg -i filename.flv -acodec copy filename.mp3

This works perfectly and is much faster than the other method.

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