Storing DVR-records on your server & Removing DVR-records

Sometimes it happens, when it is much better to keep your records of the surveillance system remotely.
(and i have noticed, that HowToForge still doesn't have a such tutorial)

My brief variant:

1. cd /
2. mkdir REPOSITORY && cd REPOSITORY
3. mkdir DVR && cd DVR
   
   Creating script, which tells to record segments, splitting them hourly.
   
4. (bash script: dvr_rec.sh) nano dvr_rec.sh
   #!/bin/bash
   ######### Lock checker ###########
   
   myName="`echo $0 | awk '{print $NF}' FS='/'`"
   
   lockDir="/var/lock/"
   
   lockFile=$lockDir$myName.pid
   
   currentPID=$$
   
   oldPID="`cat $lockFile`"
   
   oldderExist=` kill -0 $oldPID 2>/dev/null ; echo $? `
   
   if [ "$oldderExist" == "0" ]; then echo "An Other Instance Is Running...! PID:$oldPID" ; exit ; else echo $currentPID > $lockFile ; fi
   
   ######### Lock checker ###########
   
   while true
   do
   if [ -z "$1" ]; then
   IP_ADDRESS=<my_opened_ip_to_connect_with_camera>
   USER=<name>;
   PASS=<password>
   RTSPPORT=<enabled_port>
   
   else
   IP_ADDRESS=$1
   fi
   
   # FFMPEG command for creating segments from RTSP stream
   ffmpeg -i rtsp://${USER}:${PASS}@${IP_ADDRESS}:${RTSPPORT}/trackID=1 -map 0 \
   -codec:v libx264 -crf 21 -acodec copy -b:v 800k -b:a 96k -preset fast -tune zerolatency \
   -f segment \
   -strftime 1 -segment_time 3600 -segment_format mp4 "/REPOSITORY/DVR/records/%Y_%m_%d-%Hh%Mm%Ss.mp4"
   sleep 0.5
   done
   
   !verify, that you have a such path: /REPOSITORY/DVR/records (or create your own)
   
   
5. (making service) nano dvr_rec.service
   [Unit]
   Description=DVR records
   
   [Service]
   ExecStart=/REPOSITORY/DVR/dvr_rec.sh
   Restart=on-failure
   
   [Install]
   WantedBy=multi-user.target
   
6. chmod +x /REPOSITORY/DVR/dvr_rec.sh
7. ln -s /REPOSITORY/DVR/dvr_rec.service /lib/systemd/system/dvr_rec.service
8. systemctl enable dvr_rec.service
9. systemctl start dvr_rec.service
10. systemctl status dvr_rec.service
    
    The most important part - to remove staled data; your storage has not an unlimited capacity.
    
11. Script - erasing not needed files
    nano remove_dvr_records.sh:
    #!/bin/bash
    
    while true
    do
    LOCATION=/REPOSITORY/DVR/records
    REQUIRED_FILES=*.mp4
    
    find $LOCATION -name $REQUIRED_FILES -type f -mtime +2 -delete
    sleep 21600
    done
    
    
12. remove_dvr_rec.service
    [Unit]
    Description=Remove old DVR records
    
    [Service]
    ExecStart=/REPOSITORY/DVR/remove_dvr_records.sh
    Restart=on-failure
    
    [Install]
    WantedBy=multi-user.target