Recommended Encoding Parameters

The following parameters are recommended for various purposes in CBR encoding (frame rate: $fps; bit rate: $bitrate) when the input file test.yuv is 1080p.

• Low latency

  ./bin/CloudHw265App -c ~/dependency/lib/cfg/hw265_encoder.cfg -preset 6 -w 1920 -h 1080 -rc 0 -br $bitrate -pass 0 -fps_num $fps -fps_den 1 -timebase_den $fps -timebase_num 1 -keyInt $fps*2 -adap_i 0 -bframes 0 -delay 1 -FrmThreadNum 4 -WppThreadNum 4 -LookAheadThreads 3 -i test.yuv -b test.265

• High definition

  ./bin/CloudHw265App -c ~/dependency/lib/cfg/hw265_encoder.cfg -preset 6 -w 1920 -h 1080 -rc 0 -br $bitrate -pass 0 -fps_num $fps -fps_den 1 -timebase_den $fps -timebase_num 1 -keyInt $fps*2 -adap_i 0 -bframes 3 -delay 4 -FrmThreadNum 4 -WppThreadNum 4 -LookAheadThreads 3 -i test.yuv -b test.265

• Video on demand

  ./bin/CloudHw265App -c ~/dependency/lib/cfg/hw265_encoder.cfg -preset 2 -w 1920 -h 1080 -rc 0 -br $bitrate -pass 0 -fps_num $fps -fps_den 1 -timebase_den $fps -timebase_num 1 -keyInt $fps*2 -adap_i 1 -bframes 7 -delay 25 -FrmThreadNum 4 -WppThreadNum 4 -LookAheadThreads 3 -i test.yuv -b test.265

• No special encoding requirements

  ./bin/CloudHw265App -c ~/dependency/lib/cfg/hw265_encoder.cfg -preset 6 -w 1920 -h 1080 -rc 0 -br $bitrate -pass 0 -fps_num $fps -fps_den 1 -timebase_den $fps -timebase_num 1 -keyInt $fps*2 -adap_i 0 -bframes 3 -delay 4 -FrmThreadNum 4 -WppThreadNum 4 -LookAheadThreads 3 -i test.yuv -b test.265

• Enabling HDR10 (HDR Vivid not supported)

  ./bin/CloudHw265App_10bit -c ~/dependency/lib/cfg/hw265_encoder.cfg -preset 6 -w 1920 -h 1080 -rc 0 -br $bitrate -pass 0 -fps_num $fps -fps_den 1 -timebase_den $fps -timebase_num 1 -keyInt $fps*2 -adap_i 0 -bframes 3 -delay 4 -FrmThreadNum 4 -WppThreadNum 4 -LookAheadThreads 3 -hdrMode 1 -max-cll 1000 -max-fall 300 -primaries-x0 8500 -primaries-y0 39850 -primaries-x1 6550 -primaries-y1 2300 -primaries-x2 35400 -primaries-y2 14600 -white-x 15630 -white-y 16450 -max-luminance 10000000 -min-luminance 1 -atc-sei 2  -color_p 9  -transfer 16 -col_matrix 9 -fullrange 1 -i test.yuv -b test.265

  

  To encode videos based on the HDR10 standard, set the parameters based on Table 1.

  Table 1 Parameter description

  Parameter	Description	Fixed Standard Value
  -atc-sei 2	transfer	2
  -transfer 16	Transfer characteristics (SMPTE2084)	16
  -color_p 9	Primary colors (BT.2020)	9
  -col_matrix 9	Matrix coefficient (BT2020NC)	9
  -repeatHeaders 0	Do not repeat header information.	0