search

marqs85 / ossc

Open Source Scan Converter
http://junkerhq.net/xrgb/index.php/OSSC
GNU General Public License v3.0
469 stars 63 forks source link

support for hdmi 2.1? #74

Closed tails101 closed 3 years ago

tails101 commented 3 years ago

hello i have a question, will it support hdmi 2.1? this could fix weird refresh rate issue since hdmi 2.1 support variable refresh rate ( vrr ) and low latency mode for gaming.

marqs85 commented 3 years ago

The method VRR/QFP works is that a frame is sent to a display at its maximum supported clock (refresh rate) and at the end of each frame there is a variable "wait time" until next frame is ready to be sent. While this makes sense for modern PC or console sources, it's not really useful with classic consoles that scan out a fixed rate which just meets their refresh cycle. If a scaler wanted to introduce a VRR mode for these signals, it'd need to buffer the incoming data in order to be able to send it at a faster rate to display which would counterproductively introduce some latency. Fortunately, many of the displays supporting VRR also support a wider range of refresh rates in a standard mode as well.