I have an issue with rendering a 4k 30 fps project. When I change the picture to another for example 4000x6000 and render it, the rendered bit rate is 19878kbps despite I have set it to VBR 1 pass Target 80 Mbps.
There is not so much happening in the video as you can see in the video (https://youtu.be/Viq49oXdp_M) In this video, the picture dimensions are 5603x3735 and its total bitrate is 84600kbps.
I wonder if it's okay to upload 4k with a total bitrate 19878kbps as YouTube recommends 44–56 Mbps for a 30 fps HD 4k, and also what could be the cause of this significant bit rate change?
Are you using hardware encoding? (This is the default encoder setting.)
If so, that's the problem right there. Depending on your GPU, the maximum supported bitrate of hardware encodes is only 60 to 70 Mbps. And you may have an older GPU that defaulted to a fail-safe low bitrate once you exceeded those maximums.
To fix this, you will need to manually switch to software encoding. This will tax the CPU a lot more than the GPU.
Yes, I was using hardware encoding. I changed to software encoding and the file size is bigger now I put a target and maximum of 60 Mbps with VBR 1 pass. The final render came 49-50 Mbps but not 60 Mbps. Is it normal?