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Why-oh-why can't quicktime use multiple-cores?

post #1 of 4
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Could anyone shine a light on this question for me?

If i remember correctly i saw quicktime do a render with all 8 cores going full bore at an apple seminar once. Why do i have to wait for an hour for a render being processed by 1 core at a time (the active core switches every 3 seconds)

Maybe it's render settings dependant?


image added to illustrate the annoyance. (imagine "estimated time remaining: About two hours" underneath the progress bar)

post #2 of 4
It depends on what is being processed and the codec used. Often it's a linear process where only 1 thing can be calculated at a time before moving on to the next piece which would only allow one processor to be used since it can't calculate anything else at the same time.
post #3 of 4
Quote:
Originally Posted by baos View Post

Could anyone shine a light on this question for me?

If i remember correctly i saw quicktime do a render with all 8 cores going full bore at an apple seminar once. Why do i have to wait for an hour for a render being processed by 1 core at a time (the active core switches every 3 seconds)

Maybe it's render settings dependant?

Yeah it depends on the compressor but most things done in Quicktime take ages. Quicktime X in 10.6 will hopefully be reworked to solve this problem. It may even have hardware accelerated encoding.

For nearly all my encoding needs, I use VisualHub. It always uses my processors to full capacity, supports batch encoding and uses faster encoders. Plus it exports mpeg-1 and wmv, which is handy if you ever target powerpoint presentations.
post #4 of 4
This is why we are going to love 10.6...

Compressor can segment certain types of compression jobs equal to the number of cores you have.

Laters...
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