Use Previews not working in Premiere Pro 2021 (15.2)
The "Use previews" option in Premiere Pro 2021 (v15.2) on MacOS doesn't work in all cases. It seems to work when exporting in the same codec as the timeline, however, if I export a rendered ProRes timeline with loads of effects in MP4, Premiere don't use the previews to convert to MP4, instead it all re-renders the effects to export to MP4. Very annoying and it wasn't the case in Premiere 2020
Joel Ferland commented
The workaround is indeed working, but since texts and some transparency modes aren't rendered the same with Metal and Software only, it's a dangerous road if everything is not 100% rendered before to switch in software only mode.
Adobe please fix it!
We've found a workaround: render your timeline, then change your project settings to Mercury Playback Engine Software Only. You can then export using previews to H.264 and other codecs as you would normally and get fast exports.
Then change your project settings back to Mercury Playback Engine GPU Acceleration to continue editing.
It's frustrating. Adobe please fix!
Cameron Smith commented
I'm experiencing this too along with several other bugs introduced in v15. Very frustrating.