Confirmed the issue is an OPPO bug and does not occur on Panasonic.
However, at this point in time, I think Dolby on BD is a real disappointment.
1. They appear to be using 709, instead of 2020, upsampling so there is a half pixel vertical delay between Y and C. Verified this on both OPPO and Panasonic.
2. The 4:2:2 to 4:4:4 conversion in the Dolby engine, on the display side, is very low quality and lacks chroma resolution compared to HDR10 on the same display.
3. Dolby has chroma ringing in their upsampling, similar to Panasonic. You can see it come and go on the OPPO when you switch between Dolby Vision and HDR10.
Maybe I will invest in a Lumagen or MadVR Envy and use HDR10 on all Dolby titles.
I also tested player vs. tv-led. Player-led has the same issues where black is crushed more and the top two boxes on the CSE pattern don't blend, all the time! At first I thought the OPPO bug might simply be playing in player-led, but that was not the case as player-led has some other differences as well.
上面是蓝光网首席光碟测试者的专业论断!
下面是发烧友根据其他专业测试结果得出的结论:
It seems the OPPO is rife with bugs compared to other manufacturers if only OPPO had stuck around long enough to eradicate some or most of them, then their players could be deemed as "reference", the Panasonics seemingly have no Chroma bugs whatsoever & are pretty much reference for video save for a couple of quirks with Lionsgate DV titles concerning flickering & freezing issues.
I thought OPPO's 203/205 utilised "Nearest Neighbor" the easiest form of Chroma upsampling in all instances of its processing, the UDP-205 was tested & performed poorly in regards to Chroma by forum user @Sledgehamma some time ago.