Blu-ray video format
 

I received the 'Frozen Planet' Blu-ray boxed set at Christmas.
According to the box, the format is 1080i. However, the display data
from the Blu-ray player shows 1080/50p. Is one of these descriptions
wrong, or does a Blu-ray player convert from one to the other? The TV
also shows 1080p, which I assume is the input received from the
Blu-ray player.

Just wondering. Thanks.

Blu-ray video format
 

"Scott" wrote in message
...
I received the 'Frozen Planet' Blu-ray boxed set at Christmas.
According to the box, the format is 1080i. However, the display data
from the Blu-ray player shows 1080/50p. Is one of these descriptions
wrong, or does a Blu-ray player convert from one to the other? The TV
also shows 1080p, which I assume is the input received from the
Blu-ray player.

Most Blu-ray players will automatically convert the source material to the
resolution of the connected screen so even a 576i DVD will be sent to the TV
as a 1080p signal.
--
Alex

Blu-ray video format
 

On Tue, 3 Jan 2012 11:17:20 -0000, "Dr Zoidberg"
wrote:


"Scott" wrote in message
.. .
I received the 'Frozen Planet' Blu-ray boxed set at Christmas.
According to the box, the format is 1080i. However, the display data
from the Blu-ray player shows 1080/50p. Is one of these descriptions
wrong, or does a Blu-ray player convert from one to the other? The TV
also shows 1080p, which I assume is the input received from the
Blu-ray player.

Most Blu-ray players will automatically convert the source material to the
resolution of the connected screen so even a 576i DVD will be sent to the TV
as a 1080p signal.

I suspected that would be the explanation but (for the technically
unknowledgeable) how do you convert interlaced scanning to progressive
scanning? I thought interlaced meant going through all the odd lines
then going through all the even lines, with progressive meaning going
through all the lines from beginning to end, making progressive better
for fast moving images and interlaced better for scenery. If Frozen
Planet is created as 1080i will converting to 1080p cause problems, or
am I misunderstanding something?

Blu-ray video format
 

On Tue, 03 Jan 2012 11:57:35 +0000, Scott
wrote:

On Tue, 3 Jan 2012 11:17:20 -0000, "Dr Zoidberg"
wrote:


"Scott" wrote in message
. ..
I received the 'Frozen Planet' Blu-ray boxed set at Christmas.
According to the box, the format is 1080i. However, the display data
from the Blu-ray player shows 1080/50p. Is one of these descriptions
wrong, or does a Blu-ray player convert from one to the other? The TV
also shows 1080p, which I assume is the input received from the
Blu-ray player.

Most Blu-ray players will automatically convert the source material to the
resolution of the connected screen so even a 576i DVD will be sent to the TV
as a 1080p signal.

I suspected that would be the explanation but (for the technically
unknowledgeable) how do you convert interlaced scanning to progressive
scanning? I thought interlaced meant going through all the odd lines
then going through all the even lines, with progressive meaning going
through all the lines from beginning to end, making progressive better
for fast moving images and interlaced better for scenery. If Frozen
Planet is created as 1080i will converting to 1080p cause problems, or
am I misunderstanding something?

There is more information than you need here :-)
http://en.wikipedia.org/wiki/Deinterlacing

The simplest means of de-interlacing (interlaced to progressive) is to
store the incoming lines and mix the odd and even lines into a complete
picture then send that to the display. Repeat that for each pair of
frames.

As the article says there are more cunning systems that allow for
motion.

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

Blu-ray video format
 

On Tue, 03 Jan 2012 13:31:35 +0000, Peter Duncanson
wrote:

On Tue, 03 Jan 2012 11:57:35 +0000, Scott
wrote:

On Tue, 3 Jan 2012 11:17:20 -0000, "Dr Zoidberg"
wrote:


"Scott" wrote in message
...
I received the 'Frozen Planet' Blu-ray boxed set at Christmas.
According to the box, the format is 1080i. However, the display data
from the Blu-ray player shows 1080/50p. Is one of these descriptions
wrong, or does a Blu-ray player convert from one to the other? The TV
also shows 1080p, which I assume is the input received from the
Blu-ray player.

Most Blu-ray players will automatically convert the source material to the
resolution of the connected screen so even a 576i DVD will be sent to the TV
as a 1080p signal.

I suspected that would be the explanation but (for the technically
unknowledgeable) how do you convert interlaced scanning to progressive
scanning? I thought interlaced meant going through all the odd lines
then going through all the even lines, with progressive meaning going
through all the lines from beginning to end, making progressive better
for fast moving images and interlaced better for scenery. If Frozen
Planet is created as 1080i will converting to 1080p cause problems, or
am I misunderstanding something?

There is more information than you need here :-)
http://en.wikipedia.org/wiki/Deinterlacing

The simplest means of de-interlacing (interlaced to progressive) is to
store the incoming lines and mix the odd and even lines into a complete
picture then send that to the display. Repeat that for each pair of
frames.

As the article says there are more cunning systems that allow for
motion.

Thanks for that. I can't claim to have followed it all. The question
remains: why did the BBC create Frozen Planet in interlaced format?
And if it can be deinterlaced why was this not done before the Blu-ray
disc was created? Or maybe it was? I'm still confused.

Blu-ray video format
 

On 03/01/2012 1:59 PM, Scott wrote:
On Tue, 03 Jan 2012 13:31:35 +0000, Peter Duncanson




Thanks for that. I can't claim to have followed it all. The question
remains: why did the BBC create Frozen Planet in interlaced format?
And if it can be deinterlaced why was this not done before the Blu-ray
disc was created? Or maybe it was? I'm still confused.

blu ray can't do 50 or 60fps progressive so the BBC can either leave it
interlaced or throw away half of the frames to give you a 30fps
progressive disc that will be nowhere near as smooth as it should look.


--
Gareth.
That fly.... Is your magic wand.

Blu-ray video format
 

On Tue, 03 Jan 2012 18:07:07 +0000, the dog from that film you saw
wrote:

On 03/01/2012 1:59 PM, Scott wrote:
On Tue, 03 Jan 2012 13:31:35 +0000, Peter Duncanson




Thanks for that. I can't claim to have followed it all. The question
remains: why did the BBC create Frozen Planet in interlaced format?
And if it can be deinterlaced why was this not done before the Blu-ray
disc was created? Or maybe it was? I'm still confused.

blu ray can't do 50 or 60fps progressive so the BBC can either leave it
interlaced or throw away half of the frames to give you a 30fps
progressive disc that will be nowhere near as smooth as it should look.

I see that now from the Wikipedia article. I thought Blu-ray was just
a storage medium. I didn't realise that there was a limit on the
number of frames per second. If Blu-ray represents the latest
technology, is already out of date?

Blu-ray video format
 

On Tuesday, January 3rd, 2012, at 18:21:30h +0000, Scott wrote:

I thought Blu-ray was just a storage medium.

It is a little bit like DVD in that when DVDs first arrived
they were just "video" and of course the format of the video
on the disk has to be encoded and organised in files according
to a standard so that they will play on all players.

If you look at the table on the Wikipedia article at

http://en.wikipedia.org/wiki/Bluray

you can see the list of resolutions which are officially supported.

I would guess that when they were making up the list of resolutions,
the size of Bluray discs available at the time, only 25 Gbyte, was
insufficient space for a a "movie length" program at 1080p50 or 1080p60.

Furthermore, the US standard for 1080 (as used on broadcast tv)
is 1080i60.

Since movies are 1080p24 maximum, the standards writers
then did not consider 1080p50 or 1080p60 practical or possible,
and players at the time probably did not have sufficient hardware
power for playback. Remember the standards were written around
2001/2002 or so and even desktop PCs were only running around 600 MHz
with lots of cooling.

It was only later that dual layer Bluray discs with capacity of
50 Gbytes became available.

If Blu-ray represents the latest technology, is already out of date?

With the significant decline in cost of hard disk storage and the
development of {x,h}.264 encoding in mkv containers, Bluray
video format has effectively been out of date since about 2008 or so.

With the arrival of solid state storage devices, the future of
Bluray storage looks even less promising, and services such as
Netflix will lead to an early death of Bluray because most consumers
want instant gratification.

Blu-ray video format
 

On 03/01/2012 6:21 PM, Scott wrote:
On Tue, 03 Jan 2012 18:07:07 +0000, the dog from that film you saw
wrote:

On 03/01/2012 1:59 PM, Scott wrote:
On Tue, 03 Jan 2012 13:31:35 +0000, Peter Duncanson




Thanks for that. I can't claim to have followed it all. The question
remains: why did the BBC create Frozen Planet in interlaced format?
And if it can be deinterlaced why was this not done before the Blu-ray
disc was created? Or maybe it was? I'm still confused.

blu ray can't do 50 or 60fps progressive so the BBC can either leave it
interlaced or throw away half of the frames to give you a 30fps
progressive disc that will be nowhere near as smooth as it should look.

I see that now from the Wikipedia article. I thought Blu-ray was just
a storage medium. I didn't realise that there was a limit on the
number of frames per second. If Blu-ray represents the latest
technology, is already out of date?



there's no tv broadcasts in the format either.
guess they could put the blu ray out as 720p instead of 1080p to keep
the frame rate but then you'd lose detail.
only place i've seen 1080p 50/60fps is with home camcorders.

--
Gareth.
That fly.... Is your magic wand.

Blu-ray video format
 

Scott wrote:


I see that now from the Wikipedia article. I thought Blu-ray was just
a storage medium. I didn't realise that there was a limit on the
number of frames per second. If Blu-ray represents the latest
technology, is already out of date?

Of course most (all ?) Blu Ray players have the facility to connect to
t'internet, so they can be upgraded, crippled at will, etc.

If discs with enough capacity to store the data required for a decent length
1080-50p movie or programme can be produced, I suspect most machines could be
upgraded to take advantage.

However, as others have pointed out, the whole concept of 'media' delivered on
discs has a finite life anyway.

--
Mark
Please replace invalid and invalid with gmx and net to reply.

www.paras.org.uk