#!/bin/sh

set -e

HOST=${1:-morla}
if [ "$HOST" = "$(hostname --short)" ]; then
	IP=127.0.0.1
else
	IP=$(host "$HOST" | grep -Po 'address \K\S+')
fi

PORT=${2:-5004}

SIZE=640x360

MOVIE=../src/omni/show0/earth.mp4
LOGO=../../content/icon_small.png

# based on http://video.stackexchange.com/a/16933
# + codec options from http://www.webmproject.org/docs/encoder-parameters/
#   example "Real-time CBR Encoding and Streaming"
#   (bufsize = 6000 * 500k / 1000)
#   (rc_init_occupancy = 4000 * 500k / 1000)
# + Drop frames, aggressively treat as static, and use fastest cpu
ffmpeg -threads auto -re \
 -f lavfi -i "movie=filename=$MOVIE:loop=0, setpts=N/(FRAME_RATE*TB), scale=$SIZE" \
 -i "$LOGO" -filter_complex 'overlay=main_w-overlay_w-20:main_h-overlay_h-20' \
 -codec:v vp8 -quality realtime -deadline realtime -cpu-used 15 \
 -b:v 500k -minrate 500k -maxrate 500k \
 -undershoot-pct 95 -bufsize 3M -rc_init_occupancy 2M \
 -max-intra-rate 0 \
 -qmin 4 -qmax 56 \
 -static-thresh 500 -skip_threshold 50 \
 -an -f rtp "rtp://$IP:$PORT?pkt_size=1200"