Re: [linux-dvb] DVB-T South Africa

From: Rogan Dawes <lists@dawes.za.net>
To: Patrick Boettcher <patrick.boettcher@desy.de>
Cc: linux-dvb@linuxtv.org
Subject: Re: [linux-dvb] DVB-T South Africa
Date: Mon, 12 May 2008 14:50:31 +0200	[thread overview]
Message-ID: <48283D17.3060303@dawes.za.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0805121418530.11078@pub3.ifh.de>

Patrick Boettcher wrote:
> Hi,
> 
> I'm now 100% sure that this is a DVB-H transport stream.
> 
> the appearing/disappearing TS-PIDs in the dvbtraffic are indicating that 
> timeslicing is active.
> 
> The dvbsnoop clearly says that there are only MPE-sections which is 
> another indicator for that.
> 
> I will commit my two little, proof-of-concept-like, tools soon and tell 
> you where to find and how to try it.
> 
> Patrick.
> 

Great! Thanks for your help.

I look forward to trying your code out, and seeing if I can actually get 
anything from these streams.

Rogan

> 
> On Mon, 12 May 2008, Rogan Dawes wrote:
> 
>> Patrick Boettcher wrote:
>>>  Hi Rogan,
>>>
>>>  your dvbtraffic output raises a question: What happens when you run 
>>> it for
>>>  several seconds ?
>>>
>>>  Are the PIDs always the same? Especially the one with the higher 
>>> bitrate?
>>>
>>>  I'm asking because if that is the case, it could be that this is a 
>>> DVB-H
>>>  transmission.
>>>
>>>  I have some tools (which I did not commit yet) which "scan", in a very
>>>  basic way, for DVB-H services, maybe this could help you.
>>>
>>>  Before that you can try to use dvbsnoop on PID 0x00 and 0x10 to see
>>>  whether it signals a INT-section.
>>>
>>>  I could also be a pure radio transmission, but in that case scan should
>>>  detect those channels.
>>>
>>>  Patrick.
>>
>> Hi Patrick,
>>
>> Actually, I think you may well be right. Our cell networks are 
>> trialling (or even deploying) DVB-H, and the content is provided by 
>> MultiChoice. Unfortunately (for me) that content is almost definitely 
>> encrypted.
>>
>> I guess I might have to retry w_scan to see if it picks up any other 
>> frequencies that might have the real DVB-T signals on them. And maybe 
>> improve my antennae - I am currently using a Technisat DigiFlex TT2, 
>> which is just sitting on my desk.
>>
>> I am attaching the results of "dvbsnoop -s pidscan", as well as a 
>> longer capture of dvbtraffic (using "dvbtraffic | tee dvbtraffic.txt", 
>> then Ctrl-C after 6-7 seconds).
>>
>> Thanks for your help.
>>
>> Regards,
>>
>> Rogan
>>
>>
> 

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