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Green Screen – Ultra Key – choppy playback
I have just put together a green screen video in Premiere CS6 using the Ultra Key option. I rendered it all yet when I play it back it is still super choppy?? I have tried changing the options on the project (from Mercury to non mercury engine) and nothing makes a difference. I have tried changing the location of the scratch disks and all sorts – yet it remains choppy on playback. I am hoping the exported version is ok??
The computer I use is an iMac – spec: 2.7GHz Intel Core i5, 12GB, 1333MHz DDR3, AMD Radeon HD 6770M 512 MB
Can someone please tell me why this is happening – is it purely down to my system not being up to the task?
Thanks
Gavin
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5 Replies
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you’re playing off the internal drive or an external non-raid drive right?
that’s the issue.
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Maybe – I am running project off a thunderbolt Lacie hard drive?
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how full is your drive? how much consistent throughput do you get out of the external connection. If you move it to another drive, does the problem go away? Have you tried to turn on the GPU even though it doesn’t meet the minimum requirements for GPU RAM?
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Your original footage is on your Thunderbolt external drive so that plays fine. But after you rendered the effects, the preview files that were created are located where? It’s the performance of playing back those files that matters now. You say you changed the location of of the scratch disk. I wonder if that only affects the location of newly created preview files? Are there still preview files on your system drive? Look inside the folder at this location:
users/your user/documents/Adobe/Premiere Pro/premiere version number/Adobe Premiere Pro Preview Files/your project name
If preview files remained there you could delete them and re-render the sequence so they will be on your media drive (alternatively you could move them but I can’t tell you for sure whether they will relink).
I suppose another possible cause of poor playback of rendered files could be an inefficient codec for preview files, which you set in sequence settings.
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On re-reading your orig post it occurs to me that your overall system performance could be the issue. I had an ATI 6870 1GB card in a MacPro running PPro CC and it played very stuttery. I changed to a different card and now get better playback.
But to your original bottom line question — no your exports should not be affected, as long as they are a codec and data rate that you Mac can handle.
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