I've run into a pretty large bug. I have some footage from an Alexa mini. Files are ProRes 4444, 2944 x 2160, Pixel aspect 2.0.
I want to make Proxy files with a small pixel count, ideally half, 1472 x 1080.
Unfortunately, it appears that the transcode screws up the pixel aspect ratio, and all I get are black clips. I've created my own ingest presets, I've tried all the built-in presets in Premiere, both H.264 and Quicktime.
Nothing works. I can't even import the clips into Media Encoder and just transcode, skipping the ingest process.
All I get are black clips any time I try to make anything less that the native 2944 x 2160.
I was hoping someone with some Alexa mini experience would hop in. Ah well.
Do you have a short clip you could upload for me to test on my machine? If we both have the same problems, that would be good data to pass on via their UserVoice system. If it works on mine, then we've got someplace to start sorting out the issue you're having.