blob: e4b6b38e37347305f4a83b17a223a6fd00b56573 (
plain)
- #!/bin/sh
- 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
- # TODO: resolve this or resize based on it
- 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: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"
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