What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

UpGuard checks and validates configurations for every major OS, network device, and cloud provider.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:



May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags



Copy the sound content of a video to an mp3 file

Terminal - Copy the sound content of a video to an mp3 file
ffmpeg -i source.flv -vn acodec copy destination.mp3
2009-05-23 23:34:32
User: dcabanis
Copy the sound content of a video to an mp3 file

-vn removes tha video content, the copy option tells ffmpeg to use the same codec for generating the output


There is 1 alternative - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

That, of course, will only work properly if you have a video source with an mp3 audio stream.

If you downloaded an mp4, or an mov, it's likely to have an aac audio stream. I, personally, would keep it as aac, since I think it's a better codec. To do that, one could do:

ffmpeg -i source.mp4 -vn -acodec copy destination.aac

But if you really want an mp3, just take out -acodec copy, since ffmpeg is smart enough to figure it out.

ffmpeg -i source.mp4 -vn destination.mp3

If you do want to be explicit, try:

ffmpeg -i source.mp4 -vn -acodec libmp3lame destination.mp3

Of course, that won't work on many Linux distributions because they disable mp3 encoding in ffmpeg, unless you compile it from source.

Comment by goodevilgenius 464 weeks and 4 days ago

Your point of view

You must be signed in to comment.