[linux-dvb] DVB-S2 API vs. HVR4000: When?

Manu Abraham abraham.manu at gmail.com
Tue Nov 6 20:22:26 CET 2007


Francesco Schiavarelli wrote:
> Johannes Stezenbach wrote:
>> On Sat, Nov 03, 2007, Manu Abraham wrote:
>>> If you see H.2 and H.3, the difference is between CCM and VCM
>>> (Note: that both are cases of multiple "TS's")
>>>
>>> H.2 (CCM) is applicable for DVB-T muxes. Here there is a HP/LP stream
>>> selection in some fashion combined with the merger/slicer where
>>> stream id is used. 
>>
>> What makes you think there is HP/LP involved? All H.2 says
>> is that two DVB-T streams are transmitted using one
>> DVB-S2 transponder to a DVB-T transmitter. The DVB-T transmitter
>> could then transmit them on two different frequencies in
>> non-hierarchical mode.
>>
>> (Indeed H.2 says "two DTT MUXes at 24 Mbit/s each" indicating
>> they are not hierarchical because you can't get that
>> bitrate in DVB-T hierarchical mode. But even if it were DVB-T
>> hierarchical mode it has nothing to do with DVB-S2 backwards
>> compatible mode hierarchical modulation.)
>>
> I agree with you, Johannes.
> There is no evidence of hierarchical modulation, nevertheless the two
> streams I was looking at had the same channel protection that is no
> HP/LP, and I was told it was DVB-S2 CCM.
> 
> When the transponder will be up again I'll be able to do more tests.

Yeah, looks more like that, will have a patch soon to do some tests for it.
STM's comments confirm that.

Manu



Manu,

MIS allows the selection of streams using the stream identifier.

Regard Peter

PS,  I just go back from a trip.



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