Images captured at a certain interval (e.g. from a network camera in your home) can easily be converted into a movie. The simplest way to do this is to use the Linux package mencoder available as a package for most standard distributions.
For Ubuntu 8.04, mencoder can be installed just by typing
sudo apt-get install mencoder
Some tutorials on mencoder are based on an old version of the software and following them will not work. Instead the errors from mencoder will appear to indicate that some codecs are missing on the system. Installing them may solve the issue (it didn’t in my case) but will probably just waste your time.
The correct command to convert all JPEG images in a folder into a movie is
mencoder "mf://*.jpg" -mf fps=30 -o output.avi
Adjust the frame rate according to the frequency the images were taken or to make the movie go faster or slower. It is also possible to use the -speed parameter.