is a free tool which can convert video files to and
from many formats.
Get ffmpeg here: www.ffmpeg.org
ffmpeg is a command-line tool. There are also some GUI tools available
such as WinFF to use ffmpeg with many common formats and options. And
you can extract frames and do many other things with ffmpeg. There are
also some commercial products which are built upon the use of ffmpeg as
the underlying converter.
ffmpeg has its own mpeg4 converter built-in, no external codec needed
in many (most?) cases.
Here's an example of what
you can do with WinFF and ffmpeg: convert the
AVI file saved from a Dogwaffle animation, converting it into
Quicktime, mp4, Flash video (flv), mpeg1, and
The Original from PD:
(454 kb) - Compressed folder zip archive of Original AVI file (using
DivX codec). Don't open this in Quicktime viewer or Quicktime-based
browser player plugin as they may hang unless you have a codec for DivX
in Quicktime on your OS. Use Movie Player Classic or similar capable of
viewing DivX codec based AVI file.
A few conversions:
(431 kb) - bitrate 1000 (kbps), framerate 25fps, output for
websites (Flash Video , 4:3 aspect ratio FLV), two pass.
(422 kb) - same as above, converted to Quicktime (MPEG4 Video
(414 kb) - same as above, converted to MP4 with H.264 codec
There are many other formats
available in this version of WinFF, and ffmpeg may have even more.