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What is a normal render speed?

Posted: Wed, 22nd Jul 2009, 5:12pm

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agrogers

Force: 400 | Joined: 21st Jul 2009 | Posts: 2

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Hi

I have just purchased CompositeLab Pro. I was rendering a 3 minute video that had three layers - a still image, a video image with a feathered mask and a chroma-key video at standard PAL settings. It took about 4 hours to render which seemed somewhat excessive.

I have a dual core AMD 4800, 2.51Ghz, 3.5Gb RAM, 64 bit XP system. I am wondering whether this sort of render time is normal or whether i need to configure something differently.

In the video tutorials there are additional render settings to allow for faster (but lower quality) rendering which i dont see in my version.

Thanks
Andrew
Posted: Wed, 22nd Jul 2009, 6:32pm

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Terminal Velocity

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I think--and this is just from my observation--that render speed depends on number of frames, not length of video, and also how many effects you add to it. I think 4 hours is a bit long, but not hugely so.
Posted: Thu, 23rd Jul 2009, 12:43pm

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Simon K Jones

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FXhome Team Member

Richard III wrote:

I think--and this is just from my observation--that render speed depends on number of frames, not length of video
Length of video and the number of frames are exactly the same thing. smile


This does seem like a particularly long render time for a fairly simple 3 minute clip. I've recently rendered a fairly complex 20 minute project, for example, and it took about 5-6 hours.

What resolution was the still image, and the video clips?

Although your computer isn't super-fast, I would expect it to render rather faster.
Posted: Thu, 23rd Jul 2009, 12:59pm

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agrogers

Force: 400 | Joined: 21st Jul 2009 | Posts: 2

CompositeLab Pro User

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Thanks for your responses guys. Maybe the Framerate of 50.00 Fields/p/s is doing it. What are fields??

Still Image: 788x576 (50 Fields/p/s) (no effects)
Wavey Masked Image: 640x480 (30 Frames/p/s) (no effects)
Talking head: 720x576 (50 Fields/p/s) (3 effects)

Do you see any problems there? Does 50 fields = 50 frames? I didnt intend to do that esp since i am trying to render to PAL which is just 25.

Where do i look to find the current project settings? I saw them once when i created the project. Cant find them again now though.

Thanks for your help.
Andrew
Posted: Thu, 23rd Jul 2009, 1:25pm

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Terminal Velocity

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Tarn wrote:

Richard III wrote:

I think--and this is just from my observation--that render speed depends on number of frames, not length of video
Length of video and the number of frames are exactly the same thing. smile
No matter what the framerate is? That doesn't make sense.
Posted: Thu, 23rd Jul 2009, 1:41pm

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Simon K Jones

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Well, no, but it's a combination of framerate and frame number. Those two combined = length of video.

I get the feeling we're saying the same thing but in different ways. smile
Posted: Thu, 23rd Jul 2009, 4:09pm

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Terminal Velocity

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Agrogers asks if 4 hrs. is long to render a three minute video. It seems to me that it renders by frames, regardless of the video length, so for example a 3 min. video of 10 fps is going to take less time to render than a 30 fps video of the same length. Am I correct?

???
Posted: Thu, 23rd Jul 2009, 4:11pm

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Simon K Jones

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Yes, that is correct. However, he also specified that he's working with PAL footage, which is always 25fps. smile