For the end-users – reception issues
The following players are supported. You may download the installation files from here:
Installation instructions for the VLC Player
Step 1
Download and install the VLC Player.
In case you use Firefox , do not forget to install the Mozilla plugin ! Read here for instructions.
Step 2
Associate the file type .m3u (for playlists) with the VLC player.
Installation instructions for Quick Time Player
Step 1
Dοwnload and install Quick Time Player
Step 2
Set QuickTime Player Preferences as shown below.
Installation instructions for Real Player
Installation instructions for the Firefox VLC Player plugin 
1.Before installing the VLC Player plugin, first install Firefox.
2.Next, install VLC Player.
3.During the installation process, check the fields “Mozilla plugin” and “Delete preferences and cache”, as follows.
Installation of VLC Player plugin for Safari browser in MacOS 
Download from hereεδώ
VLC player 
(μόνο για multicast)
1. In order to receive the MPEG-2 streams (multicast) do the following:
2. Follow the steps below in order that the vlc player reads the SAP messages automatically.
If the multicast address is known
1. Go to File -> Open Network Stream
2. Check the option UDP/RTP/Multicast and type the multicast address (and port) to which the stream is broadcasted.
Next, press “OK”.
Ηοw to configure a windows firewall to allow unsolicited requests to connect to a program on your computer.
Example, how to unblock QuickTime Player. Do the same for VLC player.
For institute administrators – broadcasting issues
1. Go to File ->OpenCaptureDevice from the main vlc player window.
2. Next, press “Refresh list” at the “Video device name” field and then select your camera from the drop down menu. Leave the “Audio device name” field at “Default” setting. Then, check the Stream/Save option and press “Settings”.
3. At the new window called “Stream Output”, check “UDP” among the “Outputs” options. In the “Address” field, type the multicast IP address and in the “Port” field type the port. It is recommended to use the default port 1234. Select randomly a multicast address in the range of 233.21.33.1 -233.21.ΧΧ.255. Before starting the broadcast, check if there is any other broadcast to the same multicast address.
In the “Miscellaneous” area, check “SAP announce” and fill in the fields “Group name” and “Channel name”. Finally, put the value 127 in the Time-to-Live (TTL) field.
Minimum Hardware requirements: Pentium 4, CPU 2,8 GHz
Suggested HD videocamera: HV20 Canon
In order to create an Internet TV channel, like those of GRnet, follow the steps below:
1. In a linux system where the vlc player is installed, create anaccount with no root privileges. Put the video files you intend to broadcast in the home directory. The supported file types are MPEG-2 TS (transport) and Vob (program files) from DVDs. Pay attention to the fact that only single chaptered vob files are supported. It has been observed that if multiple chaptered VOB files are used, then video and audio synchronization problems appear due to the fact that the 0.8.6 version of VLC does not support them .
2. For installation instructions of vlc, go to http://www.videolan.org.
3.Launch vlc using the VideoLan Manager feature which enables the remote control of the broadcasted streams through http. VLM has an embedded http server.
3.a Determine the port XYZX to which the VLM will listen to the http requests. Make sure that there is no problem with the existing firewalls or/and access lists.
3.b Create the configuration file, which we will assume it is called “mychannel.conf”. For security reasons, in order to create the configuration file, use an account with no root privileges, e.g., vlc.
Launch VLM as using the following commands:
su vlc (the account you created)
vlc -I http --vlm-conf mychannel.conf --ttl 32 --http-host 0.0.0.0:XYZX &
The configuration file follows.
File mychannel.conf
new channelA broadcast enabled
setup channelA input /home/vlc/channel.mpg
setup channelA input /home/vlc/grnet-tech2006.mpg
setup channelA output #standard{mux=ts,access=udp,dst=multicast_ip_address,sap,group="MyGroup", name="MyChannel"}
setup channelA loop
control channelA play
In the configuration file, the order in which the files will be broadcasted, is determined. The administrator may remotely control the broadcasting from the following URL:
http://ipnameσυστήματος:XYZX/vlm.html
For security reasons, the access to the aforementioned webpage must be permitted only to the service administrator.
For further instructions visit the URL http://www.videolan.org/doc/streaming-howto/en/ch05.html.
