The solution was as you suggested :
“If you’re familiar with Regedit, please run it and look at the following key:
HKEY_CURRENT_USER\Software\wondertouch\pIllusionRender\Settings\AviCompressor
Edit it, and set its value to “0”, then close Regedit”
The value showed “3”, so I changed it as you suggested to “0”
restarted my computer and after that it worked perfectly, Thanks !