#!/bin/sh set -e AINPUT=hw:0 VINPUT=/dev/fw1 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 ACHANNELS=2 AFRAMERATE=48000 ABITRATE=32000 HEIGHT=360 VBITRATE=256000 # based on http://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming # + scale+watermark trick based on http://stackoverflow.com/a/10937357 # + Add 1s latency (deadline) # + Use same RTP payload types as GStreamer ffmpeg -hide_banner -threads auto -re \ -f alsa -sample_rate "$AFRAMERATE" -channels "$ACHANNELS" -thread_queue_size 1024 -i "$AINPUT" \ -f libdc1394 -video_size 640x480 -framerate 15 -thread_queue_size 256 -i "$VINPUT" \ -i "$LOGO" \ -filter_complex \ "[1:v]scale=-1:$HEIGHT[bg]; [bg][2:v]overlay=main_w-overlay_w-20:main_h-overlay_h-20[v]" \ -map '0:a' \ -codec:a libopus -ac "$ACHANNELS" -ar "$AFRAMERATE" -b:a "$ABITRATE" \ -f rtp -payload_type 111 "rtp://$IP:$FIRSTPORT?pkt_size=1200" \ -map '[v]' \ -pix_fmt yuv420p \ -codec:v vp8 -quality realtime -deadline 1000000 -cpu-used 15 \ -b:v "$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"