[mythtvnz] Question about quality from satellite

[ajp at cantabrian.co.nz]

> -----Original Message-----
> From: mythtvnz-bounces at lists.linuxnut.co.nz [mailto:mythtvnz-
> bounces at lists.linuxnut.co.nz] On Behalf Of David Moore
> Sent: Saturday, 13 July 2013 6:37 p.m.
> To: MythTV in NZ
> Subject: Re: [mythtvnz] Question about quality from satellite
> 
> 
> 
> 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
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> mythtvnz mailing list
> >>> mythtvnz at lists.linuxnut.co.nz
> >>> http://lists.ourshack.com/mailman/listinfo/mythtvnz
> >>> Archives http://www.gossamer-threads.com/lists/mythtv/mythtvnz/
> >> 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.
> _______________________________________________

Actually I might not have made myself clear enough in the original post :-)

I appreciate that I am only ever using SD or I guess 576 and not HD.

What I am saying is that sometimes some programs seem much better quality
than others with both being the same supposed resolution. I am theorizing
that the ones that appear to be better quality are actually ones that are
showing as full HD on terrestrial but scaled down for satellite.

I was wondering if anyone had any more info or better theory - perhaps it's
just my imagination.

I guess the bitrate is probably the place to look, I don't know.

Cheers