4k-hdr

In addition to my new 4K-HDR-TV I still own a 1080p-SDR-Full-HD-Beamer - and would like to see some of my new 4K-HDR-movies in 1080p-SDR, too. This is no problem when playing an original disc by my Panasonic DMP-UB900, it can downscale HDR to SDR without problems by brightness and color. But...