Broadcasting in 1080p

Posted by: Consciousmess on 25 September 2009

Hi all,

I have just got myself Sky HD installed as I figured I might as well get access to what was available in HD and so I could have many other channels.

However, I have since learnt that all broadcasting is in 1080i maximum and I do not receive the full 1080p.

Can anyone explain why this is so? Surely if all good large TVs can display 1080p it must be better to transmit this way?

I am perplexed and I'd rather ask the friendly forum than spend 30 minutes researching!!

Many thanks,

Jon
Posted on: 25 September 2009 by garyi
I would imagine the difference is one of bandwidth. 1080i is indeed hidef but significantly easier to broadcast than 1080p.
Posted on: 25 September 2009 by Flame
quote:
Originally posted by garyi:
I would imagine the difference is one of bandwidth. 1080i is indeed hidef but significantly easier to broadcast than 1080p.


Gary is right on the money here. a frame of 1080p video contains double the data that a similar frame would contain had it been 1080i. The broadcasting companies don't have the needed bandwidth for 1080p at the time being, it seems.

Regards...
Posted on: 25 September 2009 by Blueknowz
You my find that 720p is better than 1080i!
Posted on: 25 September 2009 by Flame
quote:
Originally posted by Blueknowz:
You my find that 720p is better than 1080i!


Most people do Smile
Posted on: 25 September 2009 by garyi
On my tv at least 720 is indeed better, but probably due to delivery from a mac mini, 1080 makes me feel a bit sick watching it, probably due to poor frame rate or something.
Posted on: 25 September 2009 by Blueknowz
Gary, there was a study last year I remember reading somewhere, between 720p /1080i/1080p & 720p was stated as giving the best viewing experience.!

Here
Posted on: 25 September 2009 by Jay
Sky HD for me works well for us at 1080i, upscaled in the av amp to 1080p onto a 1080p panel. Tried all the other combos....

I have almost always found it best to supply the native resolution to the panel if possible. 720p to a 720p panel, etc...1080i usually looks awful on a 720p panel.

Jay
Posted on: 25 September 2009 by Jay
Sorry but quality will obviously depend on the original broadcast format. Native 1080i/p looks good, 576i/p less so....
Posted on: 25 September 2009 by Occean
If you look into it I think you might find that sky only broadcast 1080i and the box just scales and deinterlaces it to 720p

On a modern tv, it's likely your tv will do a better job at converting 1080i to 1080p than the sky box will from 1080i to 720p
Posted on: 26 September 2009 by Consciousmess
Thanks for the info guys. I think it is another example of Sky trying to capture a wider audience through their marketing.

quote:
Jon,
Does your screen do 1080p HD??


It does indeed, Stu. I have a 50" plasma that I bought specifically because it was 1080p... I followed on from this by getting Sky HD but now it appears that the full 1080p won't be used and on top of this, we're looking at perhaps 5 more years before that is corrected!!

My Blu-Ray still outputs in 1080p but then we're on to the frustration I get that movie directors clip the screen top and bottom, so I don't get the full 16:9. Apologies for this particular grumble as I grumbled about this on another thread a while ago!!

Regards,

Jon
Posted on: 27 September 2009 by tonym
Although supposedly inferior, IMO it's nigh-on impossible to tell 1080i from 1080P, all else being equal.

If you want the best picture from Sky HD, treat yourself to a video processor. They make a significant difference particularly on the larger displays.
Posted on: 27 September 2009 by SC
quote:
Originally posted by Consciousmess:
My Blu-Ray still outputs in 1080p but then we're on to the frustration I get that movie directors clip the screen top and bottom, so I don't get the full 16:9.

Er, no THEY don't ! They, er, shoot in that format ! So you're seeing the 'full frame' (as we photographers would say) as it were, and what you would see if you went to the cinema...

I've never actually understood 16.9, how it came about being - seems to be a 'middle of the road' job, which is probably exactly what happened, some sort of compromise for the domestic setting...
Posted on: 28 September 2009 by Neill Ferguson
sky is a rip of with the HD service tbh its a very disappointing attempt at HD. I had standard sky through a scart lead and found only minor differences through HD yes it was clear and sharp but not worth the extra.

I now run a Loewe TV with inbuilt DVBT tuners with my sat plugged straight into the tv. I have 400 channels and am able to pause and record due to the inbuilt hard drive.

down with SLY tv
Posted on: 29 September 2009 by Eloise
quote:
Originally posted by SC:
quote:
Originally posted by Consciousmess:
My Blu-Ray still outputs in 1080p but then we're on to the frustration I get that movie directors clip the screen top and bottom, so I don't get the full 16:9.

Er, no THEY don't ! They, er, shoot in that format ! So you're seeing the 'full frame' (as we photographers would say) as it were, and what you would see if you went to the cinema...

I've never actually understood 16.9, how it came about being - seems to be a 'middle of the road' job, which is probably exactly what happened, some sort of compromise for the domestic setting...

There's quite a good Wikipedia article on Aspect Ratios and why 16:9 was chosen and (afaik) the details are all right ...

Eloise