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Comments
Thank you so much.. I was
Thank you so much.. I was looking for a tool in linux to do this stuff. I am pretty happy to be able to do it in command line :)
Worked for me
Very useful, much appreciated. MP4 to MP3, sweet as a nut.
Idiots are fun to watch...
Are you guys morons? He didn't say "extract", he said "separate", as if to bit-bucket the video and save the audio...in other words, transcoding...which is what you know-it-alls accuse him of doing...
That's like saying "You're not drinking, you're imbibing!".
Get a thesaurus, sheesh.
Read the title: "Extract the
Read the title: "Extract the MP3 Audio Portion of a Video" moron ... sheesh.
In any case it is very stupid to decode something encoded with lossy codec and encode it again with the same lossy codec, also compare how much CPU cycles takes unnecessary transcoding
vs. simple extracting on for example 2 hour video.
You showed us transcoding,
You showed us transcoding, not extracting. Proper way to extract audio (without transcoding and therefore without further loss of quality) is:
ffmpeg -i bd.flv -vn -acodec copy bd.mp3
Yes but be prepared
That probably is a better solution except when it doesn't work. I have some videos which produce unplayable mp3 files when using "-acodec copy" whereas if I don't specify the argument they will play.
Mitch Frazier is an Associate Editor for Linux Journal and the Web Editor for linuxjournal.com.
Incompatible container
That happens because ffmpeg blindly tries to copy audio stream into incompatible container, here's an example of copying vorbis audio stream from ogg container into mp3 container (and mp3 cannot hold vorbis):
ffmpeg -i in.ogg -acodec copy out.mp3
ffmpeg will do this without complaints, but mplayer cannot play this:
mplayer out.mp3
gives error. On the other hand matroska container is able to hold vorbis audio:
ffmpeg -i in.ogg -acodec copy out.mkv
and mplayer plays this with no error. So, "-acodec copy" should be used only if destination container can hold source codec.
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