What version of Processing are you using? On which system? What files do you get exactly?

I tried with Processing 1.5.1 and 1.2.1, my system is Windows 7.

And I get from 1.2.1 version: core.jar, export.txt, loading.gif, video.jar, name_of_project.class, name_of_project.jar, name_of_project.java and name_of_project.pde.

And from 1.5.1: core.jar, loading.gif, name_of_project.jar, name_of_project.java, name_of_project.pde and video.jar

Do you know what could i do?

Thanks for answering!

Strange. I just exported a sketch using the video jar with 1.5.1 on Windows 7, with Java 1.6.0_30.
For you, I uploaded it as it is to http://www.autohotkey.net/~PhiLho/HTML/processing_index_sample.html
If you use it, please, remove data specific to my sketch (coming from http://bazaar.launchpad.net/~philho/+junk/Processing/files/head:/Ferns/ if you are curious) and, of course, adapt the sketch name, the file names, etc.