Bug PrPro 2020: Export "Using Previews" not working
I have a timeline with several AE comps that I have rendered to the green status in GoPro 10bit
When I try to export an h.264 with the 'Use Previews' option the previews are ignored and AE is run in the background slowing down the export to a crawl, even thought I spent a lot of time rendering previews already. This is a straight export out of Premiere, not an AME export. This is a very typical workflow for a lot of projects and it's very frustrating that it's broken again.
- Create project with several Dynamic links in a timeline
- Render Previews for entire timeline in GoPro 10 bit(entire timeline is now green)
- h.264 Render
- Check use previews
- Export using Premiere....its going way going slower than it should
- Confirm in Task Manager that After Effects is using a significant %of CPU to render frames again instead of using the preview files.
Premiere Pro 2020
Intel i7 4770k (yeah I know I'm due for an upgrade)
RAM 32GB Ram
EVGA Nvidia GeForce GTX 1080 8GB
Preview files kept on scratch SSD
Project files on C:
Hopefully this can be addressed quickly its a real bummer.
Scott Crozier commented
Still having this problem nearly two years later. Would be nice if the checkboxes in this program worked reliably.
Joel Ferland commented
I have the same problem here (Premiere 14.9 on macOS).
When the timeline codec matches the export codec, it's fast using "Use previews", but when the export codec isn't the same, then Premieres doesn't use previews (which is more slow than just converting the source codec to the export codec, because it re-renders all effects too).
This problem is NOT present with Media Encoder, only in Premiere, so using it is a workaround for more speed.
Here are my results.
In Premiere 14.9 :
22 min. ProRes rendered timeline ==> ProRes file (using previews) : 2 minutes
22 min. ProRes rendered timeline ==> MXF file (using previews) : 40 minutes
In Media Encoder 14.9 :
22 min. ProRes rendered timeline ==> MXF file (using previews) : 15 minutes
Please fix this annoying issue.
Erik Parys commented
Ronald Hill commented
Yeah have run into this same issue. I've been rendering to ProRes and exporting using previews to avoid GPU render issues.
On export from Premiere, with "Use Previews" checked and the export settings matching my render settings and the entire timeline rendered - I still get a render error. if I send the sequence to Media Encoder with the same export settings it completes successfully.
It seems like at least occasionally Premiere is not using previews.
Peter Delahunty commented
My understanding is that you can only 'Use Previews' when the export codec is the same as the timeline rendering codec - so it doesn't have to re-render. You can't magically convert GoPro 10-bit to h.264 8-bit without rendering again.
Scott Crozier commented
Strangely enough, AME does do it correctly, but PrPro does not. So I guess that is the workaround for now.
This is a crucial workflow for things like quick turn-around sport. It's something I use a lot. Couldn't do F1 coverage without it.