Create an image preview from a movie on Ubuntu

I’ve been stuck for a while by how to create a preview of a movie on Ubuntu, until i found this great link on ubuntu forum. Tristan_F made a simple bash script to allow to extract frames from a movie and combine them into a single picture to make a preview of the movie. It’s called Framegrabber.

Framegrabber depends on Mplayer and Imagemagick, so you might want to install it first if you don’t have one.

$ sudo apt-get install mplayer imagemagick

Next, get the Framegrabber script here.

Change file permission:
$ chmod +x framegrabber

Options :
-h : print help message
-n : number of stills to extract
-s : size of each stills

.
For example, i want to create an image preview of big buck bunny movie from Blender.
$ framegrabber bigbuckbunny.ogg

framegrabber will extract 20 stills of 100 pixels, this is default value of n and s option, you can change it to suit your need.

And this is the preview.

Big Buck Bunny Screenshot

Note: There’s also GUI for framegrabber called framegrabgtk, you can give it a try.

Extract audio from video file using FFmpeg

This quick tips show you how to get/extract audio from video file (eg: Youtube video) using FFmpeg on Ubuntu.

Install it from repository :
$ sudo apt-get install ffmpeg

Now, you’re ready :
$ ffmpeg -i video.ext audio.ext

Note : ext = file extension, depends on yours.
You might want to see ffmpeg man/help to see option(bitrate, sample rate, etc).

Remove system beep on Ubuntu

This quick tips show you how to remove system beep on ubuntu which sometimes annoying especially for laptop user.
Open up /etc/modprobe.d/blacklist, add this line :

blacklist pcspkr

Then, restart your computer to see the changes.

Or, if you just want to disable it temporarily, just run :

$ sudo modprobe -r pcspkr

That’s it.
Source here.