Hello Ivan!
youtube-dl offers an option to automatically extract audio see:
youtube-dl --help
youtube-dl --extract-audio -T URL
should render a file with a name of the video and audio only. Youneed avconv
and avprobe or ffmpeg and ffprobe for this to work.
If you can't manage those tools, then ue mplayer. the -dumpaudio and
-dumpfile options are your friends. Something like this should do the trick:
mplayer -dumpaudio -dumpfile output.ogg input.webm
As far as I know, .webm has an OGG/Vorbis audio stream, so this should work.
If not, I have a script to convert any mplayer-=supported file format into
mp3.
Warm regards
Julien
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http://juliencoder.de/nama/music.html
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