Constant libaom_sys::AV1E_SET_QM_U

pub const AV1E_SET_QM_U: aome_enc_control_id = 67;

Codec control function to set the min quant matrix flatness, unsigned int parameter

AOM can operate with different ranges of quantisation matrices. As quantisation levels increase, the matrices get flatter. This control sets the flatness for chroma (U).

By default, the encoder sets this minimum at half the available range.