So I updated from 3.8 to 3.9 and started rendering a video. Audio rendering was fine but when video rendering started, the speed was really slow. Hand and note clips both played fine in the preview but rendering speed was about 10 times slower than in 3.8. I posted here before about slow rendering and paused hand clip in 3.7.2 and the issue was fixed in 3.8. Was something changed in 3.9? I also tried to render the same project I sent to your support and it had the issue (tried this and the new project in 3.8 and rendering was fast). So if you want to test it, you can find the files in email "SeeMusic 3.7.3 Rendering problem".
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Ok, thanks for responding. I guess I just use 3.8 until it's fixed.
The only thing that would have changed from 3.8 to 3.9 that possibly could have affected this would be that I upgraded Unity from version 2019.4.18 to 2019.4.19. I am using the LTS version of Unity, which is meant to be completely stable, but it's possible that they made some change to the VideoPlayer somewhere that caused an issue. It's possible that future Unity updates will fix the issue. I already recently reported an issue about VideoPlayer to them that is still open.
In general, the issue would likely be solved by re-encoding your video media - this issue only seems to occur when a video file is used that has unevenly encoded frames.