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obsproject / obs-studio

OBS Studio - Free and open source software for live streaming and screen recording
https://obsproject.com
GNU General Public License v2.0
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Quality CQP now working in 30.2.0 #10922

Closed marvin1099 closed 2 months ago

marvin1099 commented 2 months ago

Operating System Info

Other

Other OS

Arch Linux

OBS Studio Version

30.2.0-beta4

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/pZw6kleDujHbpG43

OBS Studio Crash Log URL

No response

Expected Behavior

When recording using the cqp option in the NVIDIA NVENC HEVC the quality should be high enough to not have any artifacts visible to the eye.

Current Behavior

The poor quality is clearly visible, here the small video recorded with cqp 22: https://github.com/obsproject/obs-studio/assets/40715852/c15c159e-3bf7-4a0b-8dd2-d9a3eed4fbc4

Steps to Reproduce

  1. Set endcoder to NVIDIA NVENC HEVC
  2. Set rate control to cqp
  3. Start a recording

Anything else we should know?

I think it will always results in poor quality no mater what value is entered for cqp Edit: It seems a lower cqp value still makes the quality go higher,
but the expected good quality is way higher than using -qp,
not sure if this i intended i always used qp 22 but in obs it seems it needs to be lower

flaeri commented 2 months ago

I've analyzed the video file you uploaded. It is in fact CQP 22. The smooth scrolling background has some visible macroblocking, and I assume that is what you're referring to. Unfortunately, that is expected with 8bit limited range, smooth gradients.

OBS and the NVENC encoder is doing is functioning as requested (settings are respected), so I don't think this could be considered a bug.

marvin1099 commented 2 months ago

I've analyzed the video file you uploaded. It is in fact CQP 22. The smooth scrolling background has some visible macroblocking, and I assume that is what you're referring to. Unfortunately, that is expected with 8bit limited range, smooth gradients.

OBS and the NVENC encoder is doing is functioning as requested (settings are respected), so I don't think this could be considered a bug.

Ok strange since in other recording ways this problem did not appear on -qp 22

marvin1099 commented 2 months ago

Maby it was my mistake after all the problem seems to appear on custom ffmpeg output -qp 22 too, could have sworn it worked, hmm. O well i guess i have to go lower then 22 in that case thanks anyway.