Export a sequence cropped vs scale

Hey people.

I saw this thread on the scale of a sequence of 1080 to 720 and thought I would give it a try.  I used to do the scaling when I export my clips in MPEG4, so I wanted to see if it was different.  Now, I didn't follow the instructions completely on my first pass because I forgot to back - click on the sequence and scale to the size of the image.  So my exported video eventually be cropped.  Well, no problem... easy to fix error.  The second time I spent there, I remembered the scale and everything was good.

However, what I'm curious about is the use of CPU for the two exports.  I sort of expected export to the scale to use more CPU than cropped.  But this isn't what happened, and I'm interested to know why?  The video itself is about 8.5 minutes, media are AVCHD and the MPEG4 output.  The cropped version (IE, the error) took Media Encoder at 05:49 to finish.  The scale of a 07:08 version.

The use of the processor when cropped export:

ppro-crop.png

And the use of the processor during export to the scale:

ppro-export.png

Clearly what SOUL and body were exporting my mistake, they were able to make better use of carrots on my Mac and rip through there more than a minute faster than the version on the scale.  Now, I would have expected that cropped to take less time, but I was also expecting version reduced to eating more cycles CPU.  I'm guessing there's an interesting interaction with the nVidia card going on here, but I am not sure.

Someone will ask me on the material even though actually, I think it is also relevant in this case:

  • Mac Pro 5.1 with upgrade 2 x x 5690 chips and running Lion 10.7.3
  • 48G of RAM, 16G which is zero RAM
  • nVidia Quadro 4000

Any thoughts?

JAS

The CPU usage is lower because the scale is done on the GPU if you have a card that can be used for CUDA treatment (as do you). But even with the work done on the GPU, the scaling is much, much, much more by the difficult calculation that the cropping is not surprising to me that the scale has taken longer than the cropping.

There are details on the scale with CUDA here.

Tags: Premiere

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