Producing at lower res from source is faster??

tescosfinest

Newbie Joined: Jan 15, 2010 17:29 Messages: 19 Offline

Solved by

Jan 18, 2010 17:31

Just a quick conundrum - having given up trying to get SVRT working correctly I tried switching it off to see what life would be like without it. I got some surprises. I am using ATI hardward acceleration and without SVRT what used to take maybe 4 minutes of processing would take 13minutes. However.... if I drop my project res to 720p all of a sudden it drops way down to just over 4 minutes, quite comparable to using SVRT!

What I'm confused about is that my source footage is in 1080p so surely downscaling to 720p should be giving my system more work to do not less as it has to scale each frame first before encoding? Why such a dramatic increase in performance?

Andrew

James W

Senior Contributor Location: Lakeland, FL USA Joined: Aug 18, 2008 10:36 Messages: 911 Offline

Jan 18, 2010 19:25

Have you tried build 2508? SVRT seems to work better with Canon AVCHD with this build. There have been several posts about this recently?

Opps...

Sorry, I see that your the one who reported the audio issue with SVRT.

This message was edited 1 time. Last update was at Jan 18. 2010 19:29

Q9300 2.5 GHz
4 GB Ram
Nvidia 9800 GT

JL_JL

Senior Contributor Location: Arizona, USA Joined: Oct 01, 2006 20:01 Messages: 6091 Offline

Jan 18, 2010 20:05

If you are talking the same encoder and the same amount of footage, same display size, then the number of frames to processes is fixed. So it's really how much do I have to do in each frame.

•720p = 922,000 pixels / frame
•1080p = 2,074,000 pixels / frame

I can fill in 720p with my Crayola 128 pack pretty good, however, my hand starts getting the cramps at 1080p, more than 2x the work. Then there is handling the massive volume of 0 and 1's, how fast of an I/O subsytem your computer has.

Jeff

This message was edited 2 times. Last update was at Jan 18. 2010 20:25