Specifies the VBV(HRD) buffer size in Kbits.

Specifies the VBV(HRD) initial delay in Kbits. ll_2pass_size - Multi pass encoding optimized for maintaining frame size and works only with low latency mode.ll_2pass_quality - Multi pass encoding optimized for image quality and works only with low latency mode.

vbr_minqp - ariable bitrate mode with MinQP.Source stream FPS or filter FPS is used if fps_n and fps_d is are set. It only affects num_units_in_tick and time_scale fields in SPS. Set output FPS numerator and denominator. The low latency application which wants to invalidate reference frame as an error resilience tool is recommended to use a large DPB size so that the encoder can keep old reference frames which can be used if recent frames are invalidated. Setting it to 0 will let driver use the default dpb size. Specifies the DPB size used for encoding. Specifies maximum number of B frames between non-B-frames. Number of pictures within the current GOP (Group of Pictures). If you set it to 'auto' then transcoder will choose the least busy GPU. Specifies the level of the encoded bitstream. ll - default low latency preset and the quality and speed is midway of the two other presets.default - tradeoff between performance and quality.Please find full list of available encoding parameters below. After that you can add various parameters and set up specific values to tune up your encoding process.

Ffmpeg nvenc h265