[mythtvnz] Question about quality from satellite

[Stephen Worthington]

On Sat, 13 Jul 2013 18:37:20 +1200, you wrote:

>
>
>On 13/07/2013, at 5:40 PM, Stephen Worthington <stephen_agent at jsw.gen.nz> wrote:
>
>> On Sat, 13 Jul 2013 08:00:28 +1200, you wrote:
>> 
>>> On 12/07/2013 22:24, ajp at cantabrian.co.nz wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> I have recently upgraded my frontend with it now capable of full HD 
>>>> and it's great.
>>>> 
>>>> I only record satellite in and it seems some recordings appear to be 
>>>> higher resolution or better quality than others. I am kinda theorizing 
>>>> that the good recordings are ones that are actually going out to 
>>>> terrestrial as full HD and obviously scaled back to SD because we 
>>>> don't do DVB-S2 yet -- but it's just a theory J
>>>> 
>>>> Anyone know any more or have any pet theories like I'm imagining it J
>>>> 
>>>> Thanks
>>>> 
>>>> 
>>>> 
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>>> Quite correct - Sat. here is 720p while terrestrial is 1080(i - I think).
>>> 
>>> I can see the differance and it's quite annoying since my "system" was 
>>> configure for DVB-T, but we moved into a rental that had Sky and very 
>>> bad analog....
>>> 
>>> If you want that in writing, google "Optus D1" :)
>> 
>> Some Sky channels are HD if you pay them extra for an "HD ticket".  I
>> am not sure of the exact format used as I do not pay Sky extra for
>> that, but they are broadcast on DVB-S2 transponders rather than DVB-S.
>> But the rest of the Sky channels are SD and MPEG2 video rather than
>> the much better H.264 video used on DVB-T.  They are definitely not
>> 720p = 1280x720 - the ones I watch are mostly 576i = 720x576
>> interlaced, or 704x576 interlaced.  720p is the lowest format
>> considered to be HD, although a lot of 720p broadcast programmes are
>> not actually HD - the source programmes have too low a bit rate.
>> 
>> On DVB-T, TV One and TV2 are 720p.  TV3 is 1080i = 1920x1080 but
>> interlaced ie half the resolution of 1080p. 
>
>I think TV 1, 2, 3 are all 1080i now. I suppose the bit rate on 1 and 2 will be less than 3.

Yes, you and Nick are right - I checked a recent recording from TV One
and TV2 and they were both 1080i, about 9800 kbytes/s and 8100
respectively.  The TV3 program I checked was 10800 kbytes/s.  But it
was not a proper random sample, just the latest files on one of my
recording drives.