Screncast.

VLC.
vnc2flv.
libav.
ffmpeg.
recordMyDesktop.
Screenshort movies.

VLC.

$ cvlc screen:// --screen-mouse-image cursor.png --screen-fps=12 \
  --screen-width=1680 --screen-height=1050 --no-sout-audio --sout \
  "#transcode{venc=theora,quality:10,scale=0.75,fps=12}:duplicate{dst=std{access=file,mux=ogg,dst=desktop.ogg}}}"

$ cvlc screen:// --screen-fps=12 --screen-mouse-image=e:/home/.icon/cursor.png --no-sout-audio --sout \
  "#transcode{venc=x264,quality:100,scale=1,fps=12}:duplicate{dst=std{access=file,mux=mp4,dst=desktop.ogg}}}"

Available options:

screen-caching <integer>: Time in milliseconds.
screen-fps <integer>: Capture frames per second (0 default).
screen-top <integer>: The top edge coordinate of the subscreen.
screen-left <integer>: The left edge coordinate of the subscreen.
screen-width <integer>: The width of the subscreen.
screen-height <integer>: The height of the subscreen.
screen-mouse-image <filename>: Mouse pointer image to use.

vnc2flv.

In order to rrecord require VNC server running on host.

http://www.unixuser.org/~euske/python/vnc2flv/index.html: home page

libav.

$ sudo apt-get install libav-tools

$ avconv -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
$ avconv -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg

ffmpeg.

Only video:

$ ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpg
$ ffmpeg -f x11grab -r 25 -s 1024x768 -i :0.0 out.mpg

Video with audio:

$ ffmpeg -f oss -i /dev/audio -f x11grab -s cif -r 3 -ab 11 -i :0.0 out.mp4

Oprsions description:

-r frames per second
-s resolution

recordMyDesktop.

$ recordmydesktop --no-sound --windowid $(xwininfo | awk '/Window id:/ {print $4}')

Screenshort movies.

Screenshort movie by mencoder.

$ mencoder "mf://*.jpg" -mf fps=30 -o output.avi

Screenshort movie by ffmpeg.

mplayer -ao null -ss 0:0:33 -endpos 2 eagles.avi -vo jpeg:outdir=~/dir
mplayer -ao null -ss 0:0:33 -endpos 2 eagles.avi -vo png:z=9:outdir=~/dir

Here:

-ss tells mplayer where you begin
-endpos tells mplayer where to stop (minutes)
z=9 sets compression level

ImageMagic and shell script.

#!/bin/bash
let iter=1
while [ "$iter" -le "$stop" ]; do
  import $iter.png
  sleep 1
  let x+=1
done

If you interesting in capturing specific window - by 'xwininfo' find, intereesting your window id (hex value) and use command:

import -window $windowid $iter.png

To quick view result run:

$ cd $img_dir
$ animate -delay 20 *.png
^C

To compound image together:

$ convert -delay 20 *.png capture.mng  # license free, multi-image file format
$ convert -delay 20 *.png capture.gif

You can add text to pictures before compound theirs:

$ mogrify -fill yellow -draw 'Rectangle 10,10 150,30' -fill black -pointsize 14 \
   -draw 'text 15,25 "by http://example.com"' $iter.png

If screen capturing slow for you use MIFF file format.

Use root flag to capture all screen:

$ import -window root $iter.png

http://linuxdevcenter.com/pub/a/linux/2004/03/04/screen_capture_movies.html: Making Screen-Capture Movies by Robert Bernier