Extract audio: Difference between revisions
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The [[Video Editing]] article gives some examples for using mencoder and ffmpeg, but in this case I found using ffmpeg on the command line was the easiest tool after some initial trial and error. I was surprised to find out that Avidemux didn't just do what I wanted. With Avidemux, I tried 'save audio' which produced a relatively large file, that didn't play in anything. I ran ffmpeg -i on it, and it reported "unknown format" | The [[Video Editing]] article gives some examples for using mencoder and ffmpeg, but in this case I found using ffmpeg on the command line was the easiest tool after some initial trial and error. I was surprised to find out that Avidemux didn't just do what I wanted. With Avidemux, I tried 'save audio' which produced a relatively large file, that didn't play in anything. I ran ffmpeg -i on it, and it reported "unknown format" | ||
< | <syntaxhighlight lang="bash"> | ||
# try mplayer, but it did not work | # try mplayer, but it did not work | ||
mplayer -dumpaudio VID00001.AVI -dumpfile molin-5th-grade-xmas-concert.mp3 | mplayer -dumpaudio VID00001.AVI -dumpfile molin-5th-grade-xmas-concert.mp3 | ||
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# let ffmpeg figure out what I want (WORKED) | # let ffmpeg figure out what I want (WORKED) | ||
ffmpeg -i VID00001.AVI -vn molin-5th-grade-xmas-concert.mp3 | ffmpeg -i VID00001.AVI -vn molin-5th-grade-xmas-concert.mp3 | ||
</ | </syntaxhighlight> | ||
http://soundconverter.berlios.de/header.png | http://soundconverter.berlios.de/header.png | ||
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== Download YouTube Videos == | == Download YouTube Videos == | ||
See https://github.com/rg3/youtube-dl/ | See https://github.com/rg3/youtube-dl/ | ||
< | <syntaxhighlight lang="bash">sudo pip install -U youtube-dl</syntaxhighlight> will give you a YouTube downloader that can do a lot of things, including extract the audio portion (relying on ffmpeg) | ||
recipe: | |||
<syntaxhighlight lang="bash"> | |||
musicdir=/share/CACHEDEV1_DATA/Multimedia/music | |||
videodir=/share/CACHEDEV1_DATA/Multimedia/video | |||
video='https://www.youtube.com/watch?v=kD9CrZODlNA' | |||
cd ~/Music | |||
youtube-dl --extract-audio --prefer-ffmpeg $video | |||
scp Dave\ Matthews\ Band\ -\ You\ \&\ Me-kD9CrZODlNA.m4a admin@qnap:$musicdir'/Dave\ Matthews\ Band/You\ And\ Me.m4a' | |||
scp Dave\ Matthews\ Band\ -\ You\ \&\ Me-kD9CrZODlNA.mp4 admin@qnap:$videodir'/You\ And\ Me.mp4' | |||
</syntaxhighlight> | |||
[[Category:Multimedia]] | [[Category:Multimedia]] | ||
[[Category:Music]] | [[Category:Music]] | ||
Latest revision as of 13:32, 24 February 2025
Ed. note: Sorry this is more like a blog post.
Having recorded the Molin Upper Elementary 5th Grade Christmas Concert using my video camera, I wanted to extract just the audio portion so that I could listen to the music all by itself without having to play the video. Besides, I could send the audio portion much more easily than I could send the 948 MB video file through email. The half-hour concert produced a lossless .ogg file of 21 MB and 14 MB in lossy mp3 format.
The Video Editing article gives some examples for using mencoder and ffmpeg, but in this case I found using ffmpeg on the command line was the easiest tool after some initial trial and error. I was surprised to find out that Avidemux didn't just do what I wanted. With Avidemux, I tried 'save audio' which produced a relatively large file, that didn't play in anything. I ran ffmpeg -i on it, and it reported "unknown format"
# try mplayer, but it did not work
mplayer -dumpaudio VID00001.AVI -dumpfile molin-5th-grade-xmas-concert.mp3
## Try instead to use ffmpeg
# tell me information about my source file
ffmpeg -i VID00001.AVI
# copy the audio codec; but name the output .mp3 (of course this will not work)
ffmpeg -i VID00001.AVI -acodec copy molin-5th-grade-xmas-concert.mp3
# copy the audio codec; disable video; but name the output .mp3 (of course this will not work)
ffmpeg -i VID00001.AVI -vn -acodec copy molin-5th-grade-xmas-concert.mp3
# disable video; use mp3 codec (that is not the name of a valid codec)
ffmpeg -i VID00001.AVI -vn -acodec mp3 molin-5th-grade-xmas-concert.mp3
# let ffmpeg figure out what I want (WORKED)
ffmpeg -i VID00001.AVI -vn molin-5th-grade-xmas-concert.mp3
For creating the .ogg file, I went with the easier GUI approach and used SoundConverter
http://soundconverter.berlios.de/
Download YouTube Videos
See https://github.com/rg3/youtube-dl/
sudo pip install -U youtube-dlwill give you a YouTube downloader that can do a lot of things, including extract the audio portion (relying on ffmpeg)
recipe:
musicdir=/share/CACHEDEV1_DATA/Multimedia/music
videodir=/share/CACHEDEV1_DATA/Multimedia/video
video='https://www.youtube.com/watch?v=kD9CrZODlNA'
cd ~/Music
youtube-dl --extract-audio --prefer-ffmpeg $video
scp Dave\ Matthews\ Band\ -\ You\ \&\ Me-kD9CrZODlNA.m4a admin@qnap:$musicdir'/Dave\ Matthews\ Band/You\ And\ Me.m4a'
scp Dave\ Matthews\ Band\ -\ You\ \&\ Me-kD9CrZODlNA.mp4 admin@qnap:$videodir'/You\ And\ Me.mp4'
