Well I have good news and bad news.
The good news is switching the debayer from MTI GPU to 2K (CPU) definitely sped things up. Playback was a bit smoother. And the .buf files were around 32MB. This pretty much made the “Updating Stills” dialog disappear. I think this debayer mode solves the problem.
The bad news is Cortex was not going to let go of the MTI debayer easily. Here’s some of this issues I experienced:
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Switching to CPU debayer does not “stick”. If I switched clips to CPU debayer then closed the project, when the project was reopened it was back to using the MTI GPU for debayer again.
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Media gets imported using the MTI GPU debayer (which generates 100MB .buf files). Even if I imported a single file, changed it to CPU debayer, then imported the rest of the media, the clips started using the MTI GPU debayer again. (Using the MTI GPU debayer slowed media import down to about 2.5 seconds per clip. This is after I switched the still store location to an SSD.)
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At one point going from clip to clip, the debayer setting automatically switched back to MTI GPU debayer. Not sure what triggered the change, but I didn’t manually change it.
As I mentioned, using the CPU debayer seems to have solved the “Updating Stills” problem. It also helps with playback. Now if there was a way to force Cortex to use CPU debayering, I’d be set. Is there some setting that I’ve overlooked that can change the default debayer to CPU?
Edit: BTW, this is with version 1.5.2 b4891