I recently discovered that custom ingest presets are required to create proxies in Premiere Pro for any video clips that don’t have a traditional landscape aspect ratio (16:9).
If you use a default ingest preset on footage with an arbitrary aspect ratio, the proxy video file you create will be squeezed/skewed with black side bars when played back in Premiere Pro (as seen below).
To avoid this tremendous annoyance, you’ll need to use custom ingest presets that have a resolution that matches your aspect ratio.
You can create your own or use the presets I’ve already created for 4 common aspect ratios:
16:9 Landscape video
9:16 Portrait video, commonly captured on phones
4:3 a “taller” landscape video, common on GoPros
To use my presets:
Download the 4 presets I created here
Right clicking on a video clip in Premiere Pro’s project browser
Hovering over “Proxy’ in the contextual menu that pops up
Clicking “Create Proxies”
Click the “Add Ingest Preset” button
Navigate the .epr files that you downloaded, selecting the preset that correlates to the aspect ratio of your footage.
Hope that helps!