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Use Previews in Export Media doesn’t do anything?
Hi,
my idea was to create total ProRes workflow in Premiere CS6. All my material is ProRes, my sequence+previews are ProRes and I export as ProRes. What I understand reading from manuals is that if I check Use Previews in Export Media Settings it’d use rendered previews instead of rendering from scratch when creating final output file. So in my case it’d use rendered ProRes previews and encode it once more to final output ProRes file.
I have lot of dynamic links in my sequence which takes quite long time to render. So I had already rendered those parts of my sequence as ProRes previews and thought it wouldn’t take that long to export my final output ProRes when I had Use Previews checked. But what I found out there wasn’t noticeable difference between when I had Use Previews checked and when I hadn’t.
I also read some other people have similar experiences that Use Previews doesn’t do anything. This makes Premiere Pro quite unusable if you have some render intensive parts in your sequence (such as noise reduction, dynamic links) and you have to always render everything from scratch when you export.
So am I missing something or is it that Use Previews just doesn’t work?
Best
Tapio HaajaOn-Air Promotion Producer
https://avseikkailuja.blogspot.com/ -
5 Replies
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Been there, tried that about a year ago with same results. 😀
The Prores workflow in PrP does not use “Smart Rendering” like FCP did. Because PrP supports native clips on the timeline, when it Exports the timeline to your final file format, it rebuilds each frame to that format (instead of just stitching the preview files together like FCP did). So your speed up is realized only when you have clips with effects that you prerender on the timeline. When Exported just just those frames are rebuilt (no additional rendering needed).
Its faster to render in AE then export the files and put them on the timeline. AE uses multiprocessors and generally is faster at rendering than PrP.
So use Previews works, but not in the manner that you and I want. 😀
REMEMBER if you have a powerful enough system (fast processors, powerful GPU,lots of ram, fast array) you can playback your timeline without rendering anything at all. Just export when ready.
Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com
Mac Pro 3,1
8 core
10.7.3
Nvidia Quadro 4000
24 gigs ram
Maxx Digital / Areca 8tb. raid
Kona 3 -
Thanks Tom for answer! 🙂
But I still don’t get it in which situations Use Previews does make exporting faster? I have tried effects, dynamic links without and with rendering previews before exporting exporting and for me it seems that Premiere always in every possible scenario renders everything from scratch when you export. I’m okay with the fact that you always have to render everything from scratch when you export (I really hope Adobe address this in 6.5 + add native DI codec…) but when there is checkbox for Use Previews I’d like to know what it actually does. Todd? Anyone?
Best
Tapio HaajaOn-Air Promotion Producer
https://avseikkailuja.blogspot.com/ -
When you have lots of effects on a clip many times you will need to render it to play it back and watch it. When exporting PrP uses this prerendered (Preview) clip to build the export file. No rendering is done as this export is building each frame.
If you dont render the clip, when you export it has to render all effects AND then rebuild that frame for export.
Using Prerendered (Preview) clips saves on the rendering time during export.Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com
Mac Pro 3,1
8 core
10.7.3
Nvidia Quadro 4000
24 gigs ram
Maxx Digital / Areca 8tb. raid
Kona 3 -
Yeah that is what it should do but in my tests it doesn’t do anything 🙁
Best
Tapio HaajaOn-Air Promotion Producer
https://avseikkailuja.blogspot.com/ -
Use Previews (Smart Render) only works with DVCPROHD, and some flavors of XDCAM.
Submit a feature request here: https://www.adobe.com/go/wish
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