youtube content in jce

Hello everyone

i have a joomla site with the 1.7 version and JCE2 within it.

I can't put the embed code copied on youtube or on vimeo.
I tried to put it in an article with the source code button but when i save my article the video frame disappears!before i save it, i can watch the video

So i wonder if it's JCE who recodes...

Thanks for your help and sorry for my bad english

Regards