Methods to improve the coding quality of SVtheVC encoder about svt-hevc HOT 3 CLOSED

May I ask whether the picture quality can be improved by adjusting the QPMax value or by mapping the QP logic of X265

The individual qp numbers are not apples to apples comparable between SVT-HEVC and x265, so you cannot easily map them. It is possible to gain additional quality at the expense of encoding time and bitstream size by adjusting the QPMax and qp values, but I do not think it will give you as good of a quality as x265 most of the time.

The chart you have screenshotted from https://x265.readthedocs.io/en/stable/svthevc.html does not actually mean that the quality and time spent for x265's medium preset equals SVT-HEVC's preset 6. That table only means if you decide to use SVT-HEVC through x265, it will map medium to 6 through their wrapper.

from svt-hevc.

May I ask whether the picture quality can be improved by adjusting the QPMax value or by mapping the QP logic of X265

The individual qp numbers are not apples to apples comparable between SVT-HEVC and x265, so you cannot easily map them. It is possible to gain additional quality at the expense of encoding time and bitstream size by adjusting the QPMax and qp values, but I do not think it will give you as good of a quality as x265 most of the time.

The chart you have screenshotted from https://x265.readthedocs.io/en/stable/svthevc.html does not actually mean that the quality and time spent for x265's medium preset equals SVT-HEVC's preset 6. That table only means if you decide to use SVT-HEVC through x265, it will map medium to 6 through their wrapper.

Thank you for your reply. I understand your meaning. But when I test using preset=6 or preset=4, I find that the motion scene is still not as good as Medium of X265, and the effect of Medium is barely reached by adding qmax=31 to SVtheVC, but this method is not applicable to all scenes, and the code rate is about 20% too high. Is there any other code level optimization direction

from svt-hevc.

There was also a problem that some video frames were blurry due to the low bit rate, so we temporarily used qmax to control the video frame quality and prevent its bit rate from being low

from svt-hevc.