Since*
2.6
Change video quantization parameters (QP).
The filter accepts the following option:
- qp
-
Set expression for quantization parameter.
The expression is evaluated through the eval API and can contain, among others, the following constants:
- known
-
1 if index is not 129, 0 otherwise.
- qp
-
Sequentional index starting from -129 to 128.
Examples
-
Some equation like:
qp=2+2*sin(PI*qp)