blob: a3e3b8be181a40c70189866c1ecbf89e80bb1662 (
plain)
- #!/bin/sh
- set -e
- ##
- ## defaults
- ##
- INPUT=../tmp/omni/show0/earth.yuv
- RATIO=4:3
- ##
- ## generic functions
- ##
- # shellcheck disable=SC2048,SC2059
- echo_n() {
- printf -- "$*"
- }
- HOST=${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=384
- videosize() { height=$1; width_or_ratio=$2;
- case $width_or_ratio in
- *:*) num=${width_or_ratio%:*}; den=${width_or_ratio#*:}; width=$((height*num/den));;
- *) width=$width_or_ratio;;
- esac
- echo_n $((height*width))
- }
- BITS=$(videosize "$HEIGHT" "$RATIO")
- # * 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: Externalize speeds to site-specific configfile
- if [ $BITS -le 110592 ]; then # 234p → 97344
- VBITRATE=145000
- SPEED_VP8=2
- elif [ $BITS -le 150528 ]; then # 270p → 129600
- VBITRATE=365000
- SPEED_VP8=2
- elif [ $BITS -le 196608 ]; then # 360p → 172800
- VBITRATE=730000
- SPEED_VP8=3
- elif [ $BITS -le 331776 ]; then # 432p → 331776
- VBITRATE=1100000
- SPEED_VP8=4
- elif [ $BITS -le 589824 ]; then # 540p → 518400
- VBITRATE=2000000
- SPEED_VP8=5
- elif [ $BITS -le 921600 ]; then # 720p → 921600
- VBITRATE=3000000
- SPEED_VP8=15
- fi
- encode_vp8() { bitrate=$1; speed=$2;
- echo_n "-codec:v vp8 -quality realtime -deadline 1000000 -cpu-used $speed \
- -b:v $bitrate -minrate $bitrate -maxrate $bitrate \
- -undershoot-pct 95 -bufsize $((6000*bitrate/1000)) -rc_init_occupancy $((4000*bitrate/1000)) \
- -max-intra-rate 0 \
- -qmin 4 -qmax 56"
- }
- # based on http://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming
- # + Add 1s latency (deadline)
- # + Use same RTP payload types as GStreamer
- ffmpeg -hide_banner -threads auto -re \
- -stream_loop -1 -i "$INPUT" \
- -vf format=pix_fmts=yuv420p \
- -map '0:v' \
- $(encode_vp8 "$VBITRATE" "$SPEED_VP8") \
- -f rtp -payload_type 100 "rtp://$IP:$((FIRSTPORT+2))?pkt_size=1200"
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