While I'm testing it right now on a MP7,1 with an XDR display, my real target is a Mac Mini M1 that's due for delivery RSN that will be hooked up to a huge OLED TV - which adds more variables as it should require a HDMI2.0b port and I suspect the the HDMI port on that mac isn't able to do HDR in 4K to start with (TB3 to HDMI cable/adapter might be the way to go there).

universal binary (so no rosetta 2 on an M1 based mac) can read all the relevant file formats (including mp4, mkv, etc.) XDR settings - but those should be irrelevant as Quicktime does show HDR content properly. The file can be downloaded before Google/Youtube got it as well: In fact, if you are using macOS High Sierra or earlier, using QuickTime is the only way to record your Mac’s screen for free as the screenshot tool was only introduced in macOS Mojave or later. It's got very highly visible HDR effects, so it's easy to spot if it's there or not. Apart from the methods we have outlined above, you can also screen record on a Mac using QuickTime. The following keyboard shortcuts let you control QuickTime Player without touching the mouse: Space: Start playback, or stop it if its already playing.

Latest quicktime player for mac