Dark Bars on certain 4k movies

[TheDreadPirate]

I believe this is the issue.

https://github.com/google/ExoPlayer/issues/8803

My understanding is that the issue is how the UI is rendered when the Dolby Vision video is not 3840x2160. All the Dolby Vision movies I've encountered were still 3840x2160 canvases even though the actual movie was a narrower aspect ratio. If your movie's canvas is 3840x1600, the Dolby Vision metadata is still 3840x2160 most of the time but the black bars on the bottom and top are baked into the DV metadata. Whatever Sony is doing does not render the black bars as part of the video and thus compresses the DV metadata vertically, resulting in uneven brightness.