About the production time, this was produced on 2 weeks without modeling time. I made some adjustments to de original mesh and to the texture (i add alphas and some spots to the original texture).

About Icarus, you are right guys! is not OpenSource, is free for non-commercial use :). Before i use Icarus, i try Voodo Camera tracker and a demo of SynthEyes 3-D Camera Tracker. In Voodoo i can't find the way to position the camera to the correct way to match the video footgage. In SynthEyes i feel very good control, i think it is and excelent software for a really cheap prize!. I use Icarus arter view the excelent video tutorials by Colin Levy (http://www.peerlessproductions.com), and this was the result :).

About the natural movement of the Betta fish, im working on a more fluid movement on the softbodyes. It was really hard to control the softbody on this character. I found when i apply the weight to te mesh and try to animate the posed skeleton and, at the same time, i animate the rotation+translation of the armature and rigged body, the mesh with the softbody applied starts to made a really violent movements in responses to simulated physics!. Because of that i use several bones on every fin, to try to have more control on teh softbody. I still working on different ways to solve this and obtain a better animation.

About the VLC Player, i encoded the video on a linux box using the ffmpeg feature to encode on QuickTime video. I play it on mplayer on linux and can't hear the sound neither, but on QuickTime player on Windows an Mac OS X, i hear the sound without problems. I don't know if this is a player codec issue or ffmpeg encoding issue.

Thanks every one for your comments!

I think a very good integration of 3Dgraphics e real footage, really well done.
As Bassam noticed, Icarus it's not an OSS, it only free for edu and personal use. And it's not a FreeSoftware, because the source it's not released with some license (BSD, GPLvX, etc etc).

I have only one problem with the clip: with VLC i can't hear the sound, only the video, pity.
(in Windows and also with Ubuntu)

Anyone with the same problem?

Actualy matchmovier, motion capture and image based modeling well documented over net and not so hard to do. Start your reading from WikiPedia.
http://en.wikipedia.org/wiki/Match_moving
http://en.wikipedia.org/wiki/Photogrammetry

for 2D marker trackin you shuld search some computer vision engines.
http://webcamxtra.sourceforge.net/
or very nice 2d tracker from Cinelerra http://cvs.cinelerra.org/

Just one crit tho, Siamese Fighting fishes fins arent so ridged as that, there more crumpled up cloth.

Other than that excellent. :)