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Mark, Interesting result. Motion Blur itself does not affect the final file size. It only changes the visual content, and compression depends on the content (producing larger or smaller file). If you want, you can share your original project in a ZIP archive (all files) so that we can test it with different settings. P.S. Note that FullHD is usually 1920 x 1080 (16:9 = 1.7777). 1920 x 1280 is 3:2 =1.5

Just got around to trying that Smooth modifier on the middle keyframe and it worked like a charm--thanks!

Hi, a theoretical point of view: Quality 100 for PTE means a Constant Rate Factor=19 for the codec used Lossless compression means a CRF=0 It is a logarithmic scale so from 19 to 12 for the CRF leads to a file size multiplied by 2 from 19 to 0, the file size is multiplied by more than 8. Practical point of view: one of my slide show 2:32 long with lot of move is 97 MB with quality 100 and 1.54 GB for lossless. Jill the motion blur will decrease the file size because it's more easy for the codec. Denis

I think the Motion Blur will also increase file size? Jill