[vdr] VDR and multicast streaming

Frank Schmirler vdr at schmirler.de
Tue Oct 21 16:44:20 CEST 2008


On Tue, 21 Oct 2008 14:46:52 +0200, Artem Makhutov wrote
> The ADB-Boxes use Multicast-TS. I have captured a transmission from 
> my IPTV provider. So you can take a look on it:
> 
> http://www.makhutov.org/downloads/adb/

The .pcap file is not accessible. Would it contain the IGMP traffic, too?

> The boxes send IGMP Join / Leave Group messages, if you switch or 
> turn on a channel.
> 
> Streamdev could listen for such messages an enable/disable the streams.
> 
> The IGMP Join Group messages are send in an interval (1 
> messege/minute). If an IGMP Leave Group message is recieved, or if 
> no Join Message was received during 2 minutes then the stream sould 
> be stopped.

Makes sense - that's the way how it's supposed to work when subscribing to an
Internet multicast stream, i.e. accross router boundaries. With streamdev,
each channel would become a multicast group of its own. Multicast IPs are not
an issue here. The IPv4 Local Scope for multicast addresses is large enough.
But how do you configure them in the box? Or does it listen to some sort of
announcements (getstream2 sends SAP/SDP packets)?

> The boxes also support HTML, so then can post data to a webpage, if the
> channel was switched. I am not sure if all boxes support this. At least
> the ADB boxes can do this.

Some sort of user interface would be fine anyway.

Frank



More information about the vdr mailing list