Multicore rendering

Hi
I have too a core i5 750 (with 4 cores). I have too questions.
How do you see that your intel is using two cores ?
What are the format used for the exportation ? Your results are different following (ie h264 and mpeg2).
Could you tell us more explantations ? Thanks.

Well, i can see the core usage from "system monitor", the usage during the export is like this:

[tab resources]
1 core: about 100%
1 core: about 60-70 %

other cores under 6%.
Plus, if i see the tab "processes" i can see the openshot process with 140-150% cpu usage.

I tryied export in mp2 and ogg theora , same result.

i'm on karmic x86_64.

Thank you for your answer.

okay i have seen but we can said severals things. For me
You have a anarchic utilisation at empty with the core 3 and 4 which sometimes pass to 3/4 % at 20/25% with just a few applications (firefox, glade3, nautilus)
When you do an exportation you have always a core at 100% and a second at 50/60% but it is not always the same, it's changing. i.e. i have at the beginning the core1 at 100% and the core4 at 50/60%, after the half of the encoding the core4 was at 100% and the core3 at 50/60% and after a few moment the core1 at 100% and the core2 at 50% and just after always the core 1 at 100% and the core4 at 50/60%.
Strange it seems that the power at 100% is partaged by the others, it's not the same who have all. And i'm on karmic x86_64 too. I have just look the tab ressources.

The same problem i have with avidemux and ffmpeg encoding. I think is a problem of linux kernel with i5-i7 platform. What do you think?

No it's ffmpeg and mplayer. you must use to do that a special version called ffmpeg-mt than you must compile it. Another thing, the two versions are incompatibles. you could find more explanations here :
http://www.linux.com/news/software/developer/30373-multicore-video-decoding-with-mplayer-part-1
http://www.linux.com/news/software/developer/31582-multicore-video-decoding-with-mplayer-part-2