If the program tells you "the bit rate is too low" you can see the recommendation below if you click on that message in message window. If the program recommends to increase the bit rate it's better to increase it (for example up to 25000 - 35000 kbps). If the program recommends to increase the maximum bit rate value, please go to "advanced" settings and increase the "max rate" value 1.5 times than the usual bit rate. After all the needed changes you can save the changed profile and use it for the other files.
If you need more information, you can write to tech. firstname.lastname@example.org