#!/bin/sh # TODO: Handle audio from secondary input set -e INPUT=../tmp/omni/show0/earth.yuv 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 ACHANNELS=2 AFRAMERATE_OPUS=48000 ABITRATE_OPUS=48000 # TODO 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 [ $HEIGHT -le 720 ]; then VBITRATE=3000000; SPEED_VP8=15; fi # based on http://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming # + Add 1s latency (deadline) # + Use same RTP payload types as GStreamer ffmpeg -hide_banner -threads auto -re \ -stream_loop -1 -i "$INPUT" \ -map '0:a' \ -codec:a libopus -ac "$ACHANNELS" -ar "$AFRAMERATE_OPUS" -b:a "$ABITRATE_OPUS" \ -f rtp -payload_type 111 "rtp://$IP:$FIRSTPORT?pkt_size=1200" \ -map '0:v' \ -pix_fmt yuv420p \ -codec:v vp8 -quality realtime -deadline 1000000 -cpu-used "$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"