[mythtv] DVB-S with no SDT / NIT tables

Manu Abraham abraham.manu at gmail.com
Mon Oct 29 01:23:21 UTC 2007


Bill Williamson wrote:
> On 10/26/07, Manu Abraham <abraham.manu at gmail.com> wrote:
>> Steven Ellis wrote:
>>> On Wed, October 24, 2007 12:47 am, Janne Grunau wrote:
>>>> On Tuesday 23 October 2007 07:26:25 Steven Ellis wrote:
>>>>> There are some DVB-S services on Optus D1 that don't have any SDT or
>>>>> NIT entries on their TS stream. For details see 12643V at
>>>>> http://www.lyngsat.com/optusd1.html.
>>>>>
>>>>> Now is there any way to specify Audio and Video PIDs for a channel
>>>>> when the SDT information doesn't exist?
>>>> The PIDs are defined in the in the PMT.
>>>>
>>>>> These channels can be loaded onto generic DVB-S STBs where you can
>>>>> manually add the A/V PID details, and it would be great if we could
>>>>> get them with MythTV. I've asked on the Users list, but after looking
>>>>> at the code i'm wondering if it will need a patch.
>>>> As long as there is no NIT+SDT and valid PAT+PMT on the transponder the
>>>> scanner should find them.
>>> Sadly there is no PMT either.
>>>
>>> All that the DVB-S transponder is carrying are the Audio and Video PIDs,
>>> there are no other information streams present.
>>>
>> If there are is no valid PAT/PMT, then it is not a valid MPEG2 TS (which are
>> mandatory, not optional)
> 
> 
> While that's true, the fact is:
> -Commercial (but non-propriatary) set top boxes pick up the channel
> without issue
> -Other linux based solutions pick up the channel without issue
> -If this were happening in the US it'd be a "no brainer" fix

With these solutions that you mentioned, one needs to explicitly tell the application 
about the only 2 PID's (Audio and Video) that is mentioned here.

No PCR also ?

But it sounds quite weird that a TS is generated the way it is mentioned.

Manu


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