[vdr] VDR and multicast streaming

Goga777 goga777 at bk.ru
Tue Oct 21 15:14:16 CEST 2008


you can have a look on getstream 
DVB Streaming
http://silicon-verl.de/home/flo/projects/streaming/


> Hi,
> 
> On Tue, Oct 21, 2008 at 11:48:45AM +0200, Frank Schmirler wrote:
> > On Tue, 21 Oct 2008 09:13:15 +0200, Theunis Potgieter wrote
> > > What is exactly involved in changing it from streaming to multi-
> > > casting, isn't it just changing the IP destination? Or does it 
> > > require repacking it from mpeg2-ts to something else? Sorry if this 
> > > is a stupid question.
> > 
> > We are not limited to TS here - any of the formats streamdev can remux to
> > should do.
> 
> 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/
> 
> > I'd say the following things are required:
> > - Use UDP instead of TCP for streaming (is it just switching from SOCK_STREAM
> > to SOCK_DGRAM or do we need to do something more, e.g. fixed/max. packet sizes?)
> > - Provide some way to select the channel for multicast transmission and stop
> > it when it's no longer needed (probably via streamdev http server menu. Or do
> > these kinds of settop boxes support some sort of control protocol to
> > enable/disable the stream?)
> 
> 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.
> 
> 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.
> 
> The best would be implementing the stream stop/start by using IGMP as
> this is part of the IP-Multicast standard, so in theory all multicast
> clients should support it.
> 




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