Thank you Kirill for this fast answer!

Your right : I want to take advantage of GP-GPU to keep my CPU free for
other treatments.

Nevertheless, I must admit that I am a little disappointed by your answer.
I've understood that FFmpeg should do the job but I need a vendor's API
(NVIDIA for me) + my own rendering routine.... a lot of work. I thought that
would be fully integrated in FFmpeg. 

I will investigate MythTV and Mplayer : I have already done a successfull
test with Mplayer (from 50% CPU to 4%). What I want to do now is to
understand how they implement graphic card acceleration in those apps.

See you.

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