#!/bin/sh # FIXME: Handle audio track in main input # TODO: Handle audio as secondary input set -e INPUT=../src/omni/show0/earth.mp4 LOGO=../../content/icon_small.png HOST=${1:-morla} if [ "$HOST" = "$(hostname --short)" ]; then IP=127.0.0.1 else IP=$(host "$HOST" | grep -Po 'address \K\S+') fi FIRSTPORT=${2:-5002} # even number - next 3 ports used too ITERATIONS=${3-0} # endless by default HEIGHT=360 # * height steps and bitrates based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html # * 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 VBITRATE=145000; SPEED_VP8=2; elif [ $HEIGHT -le 270 ]; then VBITRATE=365000; SPEED_VP8=2; elif [ $HEIGHT -le 360 ]; then VBITRATE=730000; SPEED_VP8=3; elif [ $HEIGHT -le 432 ]; then VBITRATE=1100000; SPEED_VP8=4; elif [ $HEIGHT -le 540 ]; then VBITRATE=2000000; SPEED_VP8=5; elif [ $HEIGHT -le 720 ]; then VBITRATE=3000000; SPEED_VP8=15; fi # based on http://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming # + loop-in-filter trick based on http://video.stackexchange.com/a/16933 # + scale+watermark trick based on http://stackoverflow.com/a/10937357 # + scale to square pixels as needed # + Add 1s latency (deadline) # + Use same RTP payload types as GStreamer ffmpeg -hide_banner -threads auto -re \ -f lavfi -i "movie=filename=$INPUT:loop=$ITERATIONS, setpts=N/(FRAME_RATE*TB)" \ -i "$LOGO" \ -filter_complex \ "[0:v]scale=iw*sar*$HEIGHT/ih:$HEIGHT,setsar=1[bg]; [bg][1:v]overlay=main_w-overlay_w-20:main_h-overlay_h-20[v]" \ -map '[v]' \ -pix_fmt yuv420p \ -codec:v vp8 -quality realtime -deadline 1000000 -cpu-used "$SPEED_VP8" \ -b:v "$VBITRATE" -minrate "$VBITRATE" -maxrate "$VBITRATE" \ -undershoot-pct 95 -bufsize $((6000*VBITRATE/1000)) -rc_init_occupancy $((4000*VBITRATE/1000)) \ -max-intra-rate 0 \ -qmin 4 -qmax 56 \ -f rtp -payload_type 100 "rtp://$IP:$((FIRSTPORT+2))?pkt_size=1200"