Confirming exact same bug here and can repeat all the same steps as you’re describing as workaround but it’s not a workaround in the larger pipeline. Never previously had this issue.
I have no problem fixing it.
I even gave a screenshot of MKVtoolnix where I can fix it.
So I’m not looking for a fix for my problem.
I’m looking for a program that doesn’t create the problem.
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I just came here to check if anyone was having performance issues, your description sounds like what I am going through, A render starts fine slows to a crawl then just stops. Im not running anything but TVAI .
its disturbing, always check the preference checking that they are set correct. I also find it disturbing that with “them” going to release a “Pro” version that they are not introducing these issues , and old Apple trick.