That’s an odd frame size. Usually, you’d have 1920 or 1440 (anamorphic) by 1080. Perhaps that’s the exact ratio of a 16mm frame. In any case you want to get out of Motion JPEG and to ProRes, as you mention. I think you can live with ProRes442 or even LT rather than HQ. Although, HQ is used for film, with old family films a lessor ProRes than HQ will be easier to work with and probably plenty of quality. You are going to have to render at some point. Either before, during or after the edit. If you can drop a clip into a ProRes sequence set up as 1920×1080 and you can play without first having to render, do that. When the edit is complete, render it. If you have to render to play, then I suggest using Compressor first to do the conversion from Motion JPEG to ProRes. Be sure to turn on Frame Controls and use a higher-quality setting for the scaling. Getting 18fps to 23.976 or 29.97 is probably the biggest issue. I’m not sure which is the best to try. Encode a short clip as a test and see how Compressor does. Again, be sure Frame Controls is on and increase the quality setting of Rate Conversion. Compressor will take a long time to do this. Good luck.
John
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