Dark Bars on certain 4k movies

[TheDreadPirate]

It is both a media issue AND a device specific issue.

The media issue is that the canvas was shrunk to a size smaller than the DV RPU. Or the HEVC video and RPU were taken from different sources and muxed together.

The device specific issue is that the RPU is scaled to match the canvas. This latter issue doesn't happen on most devices. AFAICT, this only happens on Sony devices.

However, your solution sounds reasonable and plausible if you don't want to get rid of the RPU entirely to convert the video to plain HDR10.