09.01.2022, 13:31
Hello,
The Rigya's answer says it all. You need to adjust your setting to match your RTX capabilities. For example the RTX is able to encode by using adaptive B-frames, while GTX 170 not, and this feature decrease the size with little impact on quality.
I encoded the test movie using your settings and I obtained a speed of 20.37 fps (near to your result).
![[Image: Big-Buck-4-K-Base.png]](https://i.ibb.co/XW7Dhwh/Big-Buck-4-K-Base.png)
As suggested by Rigaya it is better to adjust the CQP avoiding to use the VR 2pass encoding. I found that the following CQP values match your quality : 9-10-13
![[Image: Big-Buck-4-K-Base-CQ.png]](https://i.ibb.co/b1gxSkD/Big-Buck-4-K-Base-CQ.png)
With this settings the speed increase to 37.41 fps. But as suggested by Rigaya it also necessary to change the preset to "default" as shown in the picture above, using this preset the speed increase to 101.63 fps, with a little decrease in PSNR (from 54.242 to 54.231) and a very little increase in SSIM (from 0.997560 to 0.997562).
But I will never use your CQP because are very near to "placebo" values, this imply that you get a big size without a noticeable (using human eyes) improvement in quality. Moreover I will use the extra speed obtained, to enable the B-frames as shown in the picture below
![[Image: Big-Buck-4-K-Base-Frame.png]](https://i.ibb.co/X3j1ZnG/Big-Buck-4-K-Base-Frame.png)
Using your implied CQP of 9-10-13 and the B-frames, the encoding size decrease to 61,253.99 kbps from 82,237.40. A decrease in size of about 25% with not noticeable decrease in quality (PSNR = 54.03, SSIM = 0.9975) and little decrease in speed (92 fps).
Even if using the B-frames the size decreased significantly I will avoid to use near "placebo" values. The good in using the CQP is that you don't have to guess what is the best encoding "size" for a given movie since it depends on its content. Once you have decided what are your "acceptable" CQP settings, your are sure that all the movies will be encoded using the same quality. For example try to use the following CQP: 18-20-25 and try to see if there are noticeable differences respect to the near "placebo" values: 9-10-13.
Good Luck!
The Rigya's answer says it all. You need to adjust your setting to match your RTX capabilities. For example the RTX is able to encode by using adaptive B-frames, while GTX 170 not, and this feature decrease the size with little impact on quality.
I encoded the test movie using your settings and I obtained a speed of 20.37 fps (near to your result).
As suggested by Rigaya it is better to adjust the CQP avoiding to use the VR 2pass encoding. I found that the following CQP values match your quality : 9-10-13
With this settings the speed increase to 37.41 fps. But as suggested by Rigaya it also necessary to change the preset to "default" as shown in the picture above, using this preset the speed increase to 101.63 fps, with a little decrease in PSNR (from 54.242 to 54.231) and a very little increase in SSIM (from 0.997560 to 0.997562).
But I will never use your CQP because are very near to "placebo" values, this imply that you get a big size without a noticeable (using human eyes) improvement in quality. Moreover I will use the extra speed obtained, to enable the B-frames as shown in the picture below
Using your implied CQP of 9-10-13 and the B-frames, the encoding size decrease to 61,253.99 kbps from 82,237.40. A decrease in size of about 25% with not noticeable decrease in quality (PSNR = 54.03, SSIM = 0.9975) and little decrease in speed (92 fps).
Even if using the B-frames the size decreased significantly I will avoid to use near "placebo" values. The good in using the CQP is that you don't have to guess what is the best encoding "size" for a given movie since it depends on its content. Once you have decided what are your "acceptable" CQP settings, your are sure that all the movies will be encoded using the same quality. For example try to use the following CQP: 18-20-25 and try to see if there are noticeable differences respect to the near "placebo" values: 9-10-13.
Good Luck!