Icareus Playout FAQ

FAQ - Frequently Asked Questions


Q: HOW TO CHECK MULTICAST MPEG-TS WITH FFPROBE

A: #> ffprobe udp://<multicast_ip>:<multicast_port>

Q: How to manually synchronize the server time (once)?

A: Use the ntpdate command and the appropriate NTP server:

#service ntpd stop
#ntpdate 0.centos.pool.ntp.org    // 0.centos.pool.ntp.org is your NTP server address
Output: 10 Oct 13:48:39 ntpdate[28375]: adjust time server 194.100.2.194 offset -0.002503 sec
#service ntpd start
  • ntpdate is part of the ntp package which must be installed to run the command and
  • make sure that firewall won't block the outgoing ntp traffic to internet

Q: How to install ntp package on CentOS?

A: Find the correct package by listing packages using the yum package manager:

  1. yum list ntp
    A: Install the ntp package that is listed:
  2. yum install ntp.x86_64
  3. install the correct ntp package - could have different name on 32-bit OS

Q: How to automatically synchronize the server time?

A: Use the ntpd service to keep the server time synchronized - start the service by executing:

  1. service ntpd start
  2. yum package manager typically installs the necessary service to /etc/init.d/ntpd
  3. make sure that firewall won't block the outgoing ntp traffic to internet

Q: How to make NTP service automatically start on server boot?

A: Use chkconfig to make the service start automatically:

  1. chkconfig --add ntpd

Q: How to configure the NTP server(s) with which the time is automatically synchronized?

A: Edit the ntp configuration file using for example the vi editor:

  1. vi /etc/ntp.conf
    A: Locate the line(s) starting with "server" and replace the server names with your own choosing (press i to enter text edit mode, press ESC to enter command mode)
    A: Type ":wq" in command mode to save your changes and exit the editor
    A: Restart the ntpd service:
  2. service ntpd restart

Q: WHAT IS THE BANDWIDTH REQUIREMENT FOR EPG

14 services and EPG for ~7 days
  1. total allocated bitrate 1'518'387bits/sec
  2. EIT scedule is 1.19 MB - 1Mb/s
  3. EIT p/f is 18 KB - 74 Kb/s
24 services and EPG for ~14 days
  1. total allocated bitrate 3'377'919bits/sec
  2. EIT scedule is 3.4 MB - 2'8Mb/s
  3. EIT p/f is 24,5KB KB - 101 Kb/s

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