I'm working on a project that combines a portrait format mp4 (shot on my phone) with a landscape format .mov (shot on a Zoom Q2N). I'm displaying the videos side-by-side and am scaling them to fill the 16:9 frame.
It all worked fine, but had choppy playback. I noticed that GPU acceleration was turned off, so I enabled it. This fixed the playback, but now the mp4 clip is stretched horizontally, and has also cropped the image horizontally. I can fix this partially by stretching it back the other way, but I still can't get back the missing areas on either side.
Hard to describe (especially for a non-video savvy person like me), but here are two screenshots of the preview window. Note the doorframe to the right of my shoulder that' missing in the lower image and also the position of the guitar soundhole relative to the left edge
Using Mercury playback SW only (this is how I want it to look):
Using Mercury GPU acceleration:
I've tested this multiple times and it's 100% repeatable in this project. For reasons I can fathom, I have a second project filmed and edited in exactly the same way that doesn't have this issue. I have no idea why. I'm going to re-create the first project from scratch and see if that helps but in the meantime I'd be grateful for any tips as to what might be causing this!
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