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  1. #!/bin/sh
  2. # FIXME: Handle audio track in main input
  3. # TODO: Handle audio as secondary input
  4. set -e
  5. INPUT=../src/omni/show0/earth.mp4
  6. LOGO=../../content/icon_small.png
  7. HOST=${1:-morla}
  8. if [ "$HOST" = "$(hostname --short)" ]; then
  9. IP=127.0.0.1
  10. else
  11. IP=$(host "$HOST" | grep -Po 'address \K\S+')
  12. fi
  13. FIRSTPORT=${2:-5002} # even number - next 3 ports used too
  14. ITERATIONS=${3-0} # endless by default
  15. HEIGHT=384
  16. RATIO_NUM=4
  17. RATIO_DEN=3
  18. # * bitrates and bits in parens based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html
  19. # + bits rounded up to include nearby modulo 16 formats
  20. # + best (i.e. high-modulo) 16:9 heights: 216 288 360 432 576 720
  21. # + best (i.e. high-modulo) 4:3 heights: 288 312 384 480 624 816
  22. # * speeds tuned to just below 100% cpu usage for each combination on a multi-core computer
  23. # TODO: Externalize speeds to site-specific configfile
  24. RATIO_NUM=${RATION_NUM:-16}
  25. RATIO_DEN=${RATION_DEN:-9}
  26. WIDTH=${WIDTH:-$((HEIGHT*RATIO_NUM/RATIO_DEN))}
  27. BITS=$((WIDTH*HEIGHT))
  28. if [ $BITS -le 110592 ]; then # 234p → 97344
  29. VBITRATE=145000
  30. SPEED_VP8=2
  31. elif [ $BITS -le 150528 ]; then # 270p → 129600
  32. VBITRATE=365000
  33. SPEED_VP8=2
  34. elif [ $BITS -le 196608 ]; then # 360p → 172800
  35. VBITRATE=730000
  36. SPEED_VP8=3
  37. elif [ $BITS -le 331776 ]; then # 432p → 331776
  38. VBITRATE=1100000
  39. SPEED_VP8=4
  40. elif [ $BITS -le 589824 ]; then # 540p → 518400
  41. VBITRATE=2000000
  42. SPEED_VP8=5
  43. elif [ $BITS -le 921600 ]; then # 720p → 921600
  44. VBITRATE=3000000
  45. SPEED_VP8=15
  46. fi
  47. # shellcheck disable=SC2048,SC2059
  48. echo_n() {
  49. printf -- "$*"
  50. }
  51. encode_vp8() { bitrate=$1; speed=$2;
  52. echo_n "-codec:v vp8 -quality realtime -deadline 1000000 -cpu-used $speed \
  53. -b:v $bitrate -minrate $bitrate -maxrate $bitrate \
  54. -undershoot-pct 95 -bufsize $((6000*bitrate/1000)) -rc_init_occupancy $((4000*bitrate/1000)) \
  55. -max-intra-rate 0 \
  56. -qmin 4 -qmax 56"
  57. }
  58. # based on http://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming
  59. # + loop-in-filter trick based on http://video.stackexchange.com/a/16933
  60. # + scale+watermark trick based on http://stackoverflow.com/a/10937357
  61. # + scale to square pixels as needed
  62. # + Add 1s latency (deadline)
  63. # + Use same RTP payload types as GStreamer
  64. ffmpeg -hide_banner -threads auto -re \
  65. -f lavfi -i "movie=filename=$INPUT:loop=$ITERATIONS, setpts=N/(FRAME_RATE*TB)" \
  66. -i "$LOGO" \
  67. -filter_complex \
  68. "[0:v]format=pix_fmts=yuv420p,scale=iw*sar*$HEIGHT/ih:$HEIGHT,setsar=1[bg];
  69. [bg][1:v]overlay=main_w-overlay_w-20:main_h-overlay_h-20[v]" \
  70. -map '[v]' \
  71. $(encode_vp8 "$VBITRATE" "$SPEED_VP8") \
  72. -f rtp -payload_type 100 "rtp://$IP:$((FIRSTPORT+2))?pkt_size=1200"