diff options
Diffstat (limited to 'bin/loop+encode+stream')
| -rwxr-xr-x | bin/loop+encode+stream | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/bin/loop+encode+stream b/bin/loop+encode+stream index a0a2b1d..5beef2d 100755 --- a/bin/loop+encode+stream +++ b/bin/loop+encode+stream @@ -20,29 +20,37 @@ AFRAMERATE_OPUS=48000 ABITRATE_OPUS=48000 # TODO -HEIGHT=360 +HEIGHT=384 -# * height steps and bitrates based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html +RATIO_NUM=4 +RATIO_DEN=3 + +# * bitrates and bits in parens based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html +# + bits rounded up to include nearby modulo 16 formats +# + best (i.e. high-modulo) 16:9 heights: 216 288 360 432 576 720 +# + best (i.e. high-modulo) 4:3 heights: 288 312 384 480 624 816 # * speeds tuned to just below 100% cpu usage for each combination on a multi-core computer -# TODO: adjust height steps or bitrates for 4:3 aspect ratio -# TODO: resolve steps from source height using http://aarmstrong.org/tutorials/aspect-ratios-and-h264 # TODO: Externalize speeds to site-specific configfile -if [ $HEIGHT -le 234 ]; then +RATIO_NUM=${RATION_NUM:-16} +RATIO_DEN=${RATION_DEN:-9} +WIDTH=${WIDTH:-$((HEIGHT*RATIO_NUM/RATIO_DEN))} +BITS=$((WIDTH*HEIGHT)) +if [ $BITS -le 110592 ]; then # 234p → 97344 VBITRATE=145000 SPEED_VP8=2 -elif [ $HEIGHT -le 270 ]; then +elif [ $BITS -le 150528 ]; then # 270p → 129600 VBITRATE=365000 SPEED_VP8=2 -elif [ $HEIGHT -le 360 ]; then +elif [ $BITS -le 196608 ]; then # 360p → 172800 VBITRATE=730000 SPEED_VP8=3 -elif [ $HEIGHT -le 432 ]; then +elif [ $BITS -le 331776 ]; then # 432p → 331776 VBITRATE=1100000 SPEED_VP8=4 -elif [ $HEIGHT -le 540 ]; then +elif [ $BITS -le 589824 ]; then # 540p → 518400 VBITRATE=2000000 SPEED_VP8=5 -elif [ $HEIGHT -le 720 ]; then +elif [ $BITS -le 921600 ]; then # 720p → 921600 VBITRATE=3000000 SPEED_VP8=15 fi |