#! /bin/bash

function main() {
   if [ "$#" -eq 0 ]; then
      echo "USAGE: $0 ip ip ip..." >&2
      return 1
   fi


   function clean() {
      kill -9 $(jobs -p)
   }
   trap clean EXIT ERR
   mkdirs &
   for ip in "$@"; do
      echo recording from $ip... 
      record "$ip" &
   done
   
   for i in "$@"; do
      if ! wait -n 1; then
         echo "Something died: $?" >&2
         return 1
      fi
      return 0
   done
}

function mkdirs() {
   while sleep 10; do
      mkdir -p "${OUT_DIR:-/tmp/ffmpeg_cap}/$(date +%Y)/$(date +%m)/$(date +%d)"
   done
}

function record() {
   while true; do
      echo "starting record for $@"
      _record "$@"
      sleep 10
   done
}

function _record() {
   local out="${OUT_DIR:-/tmp/ffmpeg_cap}/%Y/%m/%d/%H-%M-%S_$1.mp4"
   ffmpeg \
      -threads 0 \
      -nostdin \
      -nostats \
      -loglevel error \
      -i rtsp://192.168.0.$1:8554/unicast \
      -an \
      -map 0 \
      -force_key_frames "expr:gte(t,n_forced*9)" \
      -f segment \
      -segment_time ${SEG:-300} \
      -segment_format mp4 \
      -strftime 1 \
      -minrate .05k \
      -vcodec copy \
      "$out" \
      -vf "select=gt(scene\,0.003),setpts=N/(15*TB)" \
   < /dev/null \
   >> /tmp/ffmpegs.log \
   2>&1 
}

if [ "$0" == "$BASH_SOURCE" ]; then
   main "$@"
fi