When processing a UHD Quicktime Prores video at 2x speed using the Apollo model I am encountering region blocks that are visible in the output. Blocks that are darker and lighter than the original image - see screenshot
Unfortunately I cant share the input video as Im under NDA with it. But I’ll find another video where the issue happens and send it on when I have a moment.
So far Ive had this happen on two videos - both using the Apollo model at UHD 25fps. If I scale the input source video to a 1080p version then it handles it just fine without the blocky regions happening.
Im sending you another test video via dropbox that shows the issue (sending you both input and output videos). Screenshots attached again here, as well as one with the contrast boosted to make the issue clearer.
Another issue Im having is that although I set the slow motion to 2x, Im finding that a 3sec video doesnt get retimed to 6sec as one would expect. Videos are always coming back a few frames short of the desired output duration.
I was unable to reproduce this strangely! I also tested with all other frame interpolation models with the ProRes 422 and 4444 encoders and failed to generate these artifacts. I also do not see any difference in the export time of the input vs output. I do see that three frames are missing, the output should only be one frame short, however, we have seen other reports of multiple frames cut off.