In the current Developer version, 39.0.2226.0, and in the previous Dev version, the video pop out color is muted in comparison to the original video. If you open a video on youtube, click the pop out, then put them side by side as they run, it is easy to see the washed out look of colors in the pop out.
I searched the threads and did not see anyone mention this. I am using Windows 10 x64 1511 (Build 10586.318). This happens in both the x64 and x86 builds of Opera.
If I use Chrome, and the floating for youtube extension & app from the Chrome store, the video pop out matches the color quality of the original.
Is this problem known internally? If yes, is a fix all ready being worked on? Or is this the first time the issue is being mentioned?