Freesat 1080i

"Adrian" wrote in message
om...



I've never seen a 720 line screen. Can you give an example, make/model?



a lot of early so called HD ready ones were - like the sony sets that were
in fact 15:9 rather than 16:9.




--
Gareth.

that fly...... is your magic wand....

Adrian wrote:
Stephen wrote:
On Sat, 05 Sep 2009 22:09:58 +0100, Andy Champ
wrote:

Dr Zoidberg wrote:
"Stephen" wrote in message
snip
Are you saying that for a given bitrate , a 1080i picture would be
better than a 1080p?
If so , I agree.

Surely this is only true for a fairly low bandwidth?

However, as all our broadcasts _are_ low bandwidth I'm nitpicking.

snip
I thought SKY HD and the Freesat boxes offer a choice of 720p and
1080i output format.
Are all programs transmitted in 1080i and then converted to 720P by
the receiver?


My understanding is that the box will show what is broadcast.

True - but the display usually has either 1080 or 720 lines, so has
to convert.

My take on this is that all the newer screens are going for 1080
lines.

It also seems reasonable that you can do a better job of scaling if
you have enough lines on the display (ie from 720p source up to 1080
line display), but if you cannot show all lines you need to throw
something useful away (720 line screen but 1080 source).

maybe that translates into "1080 screens are better" but video seems
to be full of obvious results that turn out to be wrong (or maybe not
always right)

Andy

I've never seen a 720 line screen. Can you give an example,
make/model?

Loads of projectors, take your pick.

On Mon, 07 Sep 2009 22:55:24 +0100, Andy Champ
wrote:

Adrian wrote:

I've never seen a 720 line screen. Can you give an example, make/model?

Darnn that's confusing snipping.

I've never seen a 720-line screen either, and I'm still waiting for a
rational explanation for the plethora of 768-line units. And no, I
don't believe they are repurposed computer displays. Not with that few
pixels on that big an area.

Well, it's like this:

SD has 576 lines

1.3333... times 576 = 768

1.3333... times 768 = 1024

OK. So where did the extra 56 lines come from?


--
Peter Duncanson
(in uk.tech.digital-tv)

Peter Duncanson wrote:
On Mon, 07 Sep 2009 22:55:24 +0100, Andy Champ
wrote:

Adrian wrote:

I've never seen a 720 line screen. Can you give an example,
make/model?

Darnn that's confusing snipping.

I've never seen a 720-line screen either, and I'm still waiting for a
rational explanation for the plethora of 768-line units. And no, I
don't believe they are repurposed computer displays. Not with that
few pixels on that big an area.

Well, it's like this:

SD has 576 lines

1.3333... times 576 = 768

1.3333... times 768 = 1024

OK. So where did the extra 56 lines come from?

That seems even less likely, SD in Japan, USA etc. is 480 lines.
--
^..^ This is Kitty. Copy and paste Kitty into your signature to help
her wipe out Bunny's world domination.

On 8 Sep, 10:07, "Adrian" wrote:
Peter Duncanson wrote:
On Mon, 07 Sep 2009 22:55:24 +0100, Andy Champ
wrote:

Adrian wrote:

I've never seen a 720 line screen. Can you give an example,
make/model?

Darnn that's confusing snipping.

I've never seen a 720-line screen either, and I'm still waiting for a
rational explanation for the plethora of 768-line units. *And no, I
don't believe they are repurposed computer displays. *Not with that
few pixels on that big an area.

Well, it's like this:

SD has 576 lines

1.3333... times 576 = 768

1.3333... times 768 = 1024

OK. So where did the extra 56 lines come from?

That seems even less likely, SD in Japan, USA etc. is 480 lines.
--
*^..^ This is Kitty. Copy and paste Kitty into your signature to help
her wipe out Bunny's world domination.

and
1.5 * 480 = 720
1.5 * 720 = 1080

(can't seem to post via eternal-september today)

tvAddict wrote:

and
1.5 * 480 = 720
1.5 * 720 = 1080

(can't seem to post via eternal-september today)

.... and bearing in mind the size of the Japanese and US markets, versus
ours, you wouldn't build a panel plant aimed at the European market only
if you could possibly avoid it.

I just checked USA-Amazon - they are still 768 pixels there, and 768/480
is an even more silly 8/5.

Andy

tvAddict wrote:
On 8 Sep, 10:07, "Adrian" wrote:
Peter Duncanson wrote:
On Mon, 07 Sep 2009 22:55:24 +0100, Andy Champ
wrote:

Adrian wrote:

I've never seen a 720 line screen. Can you give an example,
make/model?

Darnn that's confusing snipping.

I've never seen a 720-line screen either, and I'm still waiting
for a rational explanation for the plethora of 768-line units. And
no, I don't believe they are repurposed computer displays. Not
with that few pixels on that big an area.

Well, it's like this:

SD has 576 lines

1.3333... times 576 = 768

1.3333... times 768 = 1024

OK. So where did the extra 56 lines come from?

That seems even less likely, SD in Japan, USA etc. is 480 lines.
--
^..^ This is Kitty. Copy and paste Kitty into your signature to
help
her wipe out Bunny's world domination.

and
1.5 * 480 = 720
1.5 * 720 = 1080

(can't seem to post via eternal-september today)

So why are there no 720 screens? There are pleanty of 768 which doesn't suit
any TV standards.
--
^..^ This is Kitty. Copy and paste Kitty into your signature to help
her wipe out Bunny's world domination.

On Mon, 7 Sep 2009 22:05:19 +0100, "Adrian" wrote:

Stephen wrote:
On Sat, 05 Sep 2009 22:09:58 +0100, Andy Champ
wrote:

Dr Zoidberg wrote:
"Stephen" wrote in message
snip
Are you saying that for a given bitrate , a 1080i picture would be
better than a 1080p?
If so , I agree.

Surely this is only true for a fairly low bandwidth?

However, as all our broadcasts _are_ low bandwidth I'm nitpicking.

snip
I thought SKY HD and the Freesat boxes offer a choice of 720p and
1080i output format.
Are all programs transmitted in 1080i and then converted to 720P by
the receiver?


My understanding is that the box will show what is broadcast.

True - but the display usually has either 1080 or 720 lines, so has to
convert.

My take on this is that all the newer screens are going for 1080
lines.

It also seems reasonable that you can do a better job of scaling if
you have enough lines on the display (ie from 720p source up to 1080
line display), but if you cannot show all lines you need to throw
something useful away (720 line screen but 1080 source).

maybe that translates into "1080 screens are better" but video seems
to be full of obvious results that turn out to be wrong (or maybe not
always right)

Andy

I've never seen a 720 line screen. Can you give an example, make/model?

i have an old samsung LCD hybrid (also works as a computer monitor).

it is 768 lines as a monitor and claims to be 720p.

So maybe a few lines not in use when showing a TV picture.....
--
Regards

- replace xyz with ntl

In article , Peter Duncanson
writes
Well, it's like this:

SD has 576 lines

1.3333... times 576 = 768

So why do 1366 x 768 screens overscan SD video?

I have such a Panny Viera LCD screen. PC input at 1366x768 is full
screen, display pixels matching output pixel: based on the quality of
the text there is no, or exceptionally good, resampling.

SD video however, whether off air, DVD, camera or PC composite input, is
about 5% overscanned, which makes that 1.333 closer to 1.5x, but not
enough to make usefully low integers and the resampling is pretty
obvious on detail with full SD resolution, let alone 720p HD.
--
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's ****ed.
Python Philosophers (replace 'nospam' with 'kennedym' when replying)

On Fri, 11 Sep 2009 01:26:21 +0100, Kennedy McEwen
wrote:

In article , Peter Duncanson
writes
Well, it's like this:

SD has 576 lines

1.3333... times 576 = 768

So why do 1366 x 768 screens overscan SD video?

maybe they go for 512 x 1.5 = 768?

I have such a Panny Viera LCD screen. PC input at 1366x768 is full
screen, display pixels matching output pixel: based on the quality of
the text there is no, or exceptionally good, resampling.

SD video however, whether off air, DVD, camera or PC composite input, is
about 5% overscanned, which makes that 1.333 closer to 1.5x, but not
enough to make usefully low integers and the resampling is pretty
obvious on detail with full SD resolution, let alone 720p HD.
--
Regards

- replace xyz with ntl