[linux-dvb] networked digital tuner project

Philip Prindeville philipp at enteka.com
Tue Jun 14 21:17:57 CEST 2005



Wolfgang Wegner wrote:
> Hi,
> 
> On Tue, Jun 14, 2005 at 12:49:38AM -0600, Philip Prindeville wrote:
> 
>>Byte parallel?  Why?  The whole point of multicast is you
>>join a group that is relevant to what you want...  If you
>>interlaced all of the streams (which isn't reasonable for
>>large numbers of streams), then you get a lot of traffic,
>>the majority of which gets thrown away.
> 
> 
> byte parallel is the stream at hardware level, it has
> nothing to do with how you transmit the stream(s).
> 
> 
>>You'd more likely want to have one channel (possibly
>>combining HD, ED, and SD PIDs) per multicast address.
>>This allows the receiver to only get the traffic that
>>is useful to him.
> 
> 
> well - I do not know if there is hierarchical modulation
> really used anywhere, but still, this is not more than
> demultiplexing and sending one PID per multicast address.

What about programming that has multiple languages, or
multiple audio formats (say stereo and DD 5.1)?  At the
very least, you'd need to combine one or more audio,
video, and programming information.

-Philip


> 
> 
>>-Philip
> 
> 
> Regards,
> Wolfgang








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