OK, this is the end of my experiments, and here is the best configuration with two functional streams that can be achieved with firmware 1.0.26 (thanks to Jessie for posting it!): HDMI Main: H265, fps = 30, vbr, key interval = 60, Encoded size up to 1920 x 1080, MinQp = 4, MaxQp = 45, MaxBitrate (K)...