Seems like there is a bug with flat screen ("perspective" projection) videos not properly applying color settings when opened. Does your issue also occur when using equirectangular or fisheye projection?
Viewing post in Default preset help
Sorry for delay, traveling during the weekend. If I set a video to equirectangular when it does not auto detect it will automatically apply the settings. Although if I play a video that automatically starts in equirectangular then it will not apply the default.
I have to admit that the colors look great in equirectangular, so it never bothered me previously. Now that I am messing with it a bit more perspective is the only one I see a saturation problem in. I am mostly with a few tweaks using what was referenced in a year old thread's settings https://itch.io/t/2444688/color-management
It makes me wonder if the color settings/sharpness that is used from equirectangular can be applied to the perspective so would not even need to change the default. Edit: Well I guess I do see some saturation on certain colors on vr videos also, but not as intense. I would almost need a default per viewing mode, but that sounds like it would complicate the ui too much and more time on your part. If the default is fixed I can just set the default based on if I am viewing vr vs perspective videos as I would not be popping around quickly.