Pixelated stream

[Suslik V]

@qhobbes Realtime render is not always rendered the same. Artist can place random animations to crowd, grass, weather and physics etc (that will be slightly different at each run). For example, in old tests of encoders (link was posted above) OBS source was fed with prerecorded video at high resolution and very high quality (yeah, it wasn't realtime 3D render).

Anti-aliasing techniques in render can improve quality of the final video when you are using H.264 like encoders -> less edges ("ladder") = higher quality. Streamers may try to avoid contrast objects in the composition (camera on top of the video usually has sharp edges that is not good, but if it is large enough - it will cover unpredictable background). T-shirt with fine detailed picture will take additional bits for compression... There are many things that can be done outside encoder settings.

 

[JohnConnory]

I don't know if i'm doing this right but i tried to put a picture on the screen to act as a "border" to test. i made the image litterally take half the screen to test, and the game on the other side was just as blurry as it was without it. Am i testing it wrong?

 

[Suslik V]

1. "blurry"? How it looks your "blur"? Can you provide screenshot where it is blurry and where it is not?
2. If you have enough bandwidth to store all details - you don't need to cover anything. But if you have a lot of small details and you have limited bandwidth to store them all, then the quality will improve if part of the image will be covered (see attachments below for comparison).

original (same frame):

 

[JohnConnory]

Yes! I can provide pictures:
1) Original
2) Encoded
3) Encoded halved

 

[Suslik V]

I see only chroma subsampling (color text) and nothing special in these pictures. Halved picture has more details. Chroma subsampling of 4:2:0 is limitation for streaming set by all popular services.

Brief info on chroma (+test charts) can be found here:

OBS Studio: Color Space, Color Format, Color Range settings Guide. Test charts.

Introduction. For higher compression rate, video encoders usually use methods of representation of each video frame as 3 separate channels: one for luminosity and two for color. This allow to compress color info separately from the luminance...

obsproject.com

Also, you can find more info about chroma subsampling online.

 

[JohnConnory]

Okay, i guess it's me then, i see a lot of difference between the Original picture and the Encoded, difference that i don't witness in streamers with a configuration near mine, but maybe it is just an impression. I will look about the chroma subsampling, it looks interstingg and maybe it'll help me! thanks!