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:
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