Question / Help AMD Video Coding Engine - VBR does not work as intended?

[PrinceVinc]

YouTube Streaming
If I start the Stream the kb/s are to low (1200~2000) for the Image and QP settings I determined for this.
How do I know? The Video is Super Pixelated.
If I put 6000 instead of 50 in Bitrate the Video is fine and the Bitrate is at max and occasionally goes above 6000 (Max Bitrate)

So my Problem being: As I understand, in both cases the kb/s should go up to the Maximum 6000, so why not use 6000 CBR? Easy, there are some games that have way less movement than the Game I tested with. DMC4 vs Game DevTycoon. Obviously GDT does not need 6000 to have a clear Image.

So any1 know why this is?

And on a side note, if you activate Low Latency the Encoder is overloaded (no image at all) and if you stop streaming OBS hangs himself up.

 

[Mroczny_Gustaw]

YT wants CBR, why are you trying to VBR? https://support.google.com/youtube/answer/2853702?hl=en

 

[PrinceVinc]

Oh, I forgot to mention that. I want to measure how much kb/s I actually need so I don't use more than I need.
I have a Fair Use Internet, so I am limited to 300GB High Speed I-net in 1 Month.
2nd of all VBR Works just as good (only ever tested it with Stardew Valley and old OBS)

So my main concerns are:
How does VBR work in general.
Why is low latency cuasing OBS to freeze/not working?

 

[Suslik V]

Maybe this page has some usful info in Remarks section, general info: https://msdn.microsoft.com/en-us/library/windows/desktop/dd797816(v=vs.85).aspx