Blank picture on DVR recordings

I have recordings that are 1080i and MPEG4. When I play them on iOS or Apple TV I get sound but a blank picture. If I set it to transcode to 1080p it works fine. My tuner is the winTV-DualHD

Anyone know a fix for this? I’d rather not have to select the quality every time I want to watch a recording. If the video format isn’t supported on iOS/ATV shouldn’t Plex know to automatically transcode?

Also interestingly Live TV works fine, the only issue is with saved recordings