BD discs, - what resolution?

[DaDane]

What resolution will BD discs be recorded in?

All of them 1080p???

And those (perhaps all) will they ALSO be recorded in 720p to give people with a screen with that resolution optimum viewing or will that be up to the player and/or display to handle?

[erdega79]

prerecorded discs will be recorded at 1080p for optimal hdtv resolution. Of course it will include downconverters to scale the images to your tv set. Rewriteable discs will be recordeable in all the different resolution 480i, 480p, 720p, 1080i, 1080p depending on the source and recording time desired. Thus, higher quality means less time and lower quality means more time

[zombie]

I believe the plan is for 16:9 movies and TV series at 1080p and 480i for 4:3 movies and TV series. I read one article stating that an entire TV series could fit on one Blu-ray disc. Well it'd have to be a 4:3 show at 480i in order to fit so these two options seem clear. Perhaps there will be other resolutions available as well but I'm pretty sure there will be an option to convert both 480i and 1080p programs to 1080i. I sure hope so since almost all current HDTVs can't handle 1080p.

[erdega79]

aspect ratio is one way to tell if it's a hdtv or analogue tv. All hdtv have 16:9 while analogue is 4:3 of course.
So what about blu ray disc here and what do they play?

It's simple , games and movies will be encoded for optimum resolution, in this case 1920x1080p . Blu ray players should have downconverters to scale down the image to the resolution of tv set It will thus converting image to something like a dvd drive. This is something that should be set the first time you connect a blu ray player to the tv set. One point to remember is that there can't be dual discs where blu ray disc carries dvd version of a movie. Of course this has everyting to do with the type of rays used by 2 formats, red rays for dvd and blu rays for bd and some physical specifications.

[observer]

Originally Posted by erdega79

It's simple , games and movies will be encoded for optimum resolution, in this case 1920x1080p .

lets hope...Hollywood would love nothing more then to give us 720p discs for now and give themselves an excuse to re-sell us the same content 10 years from now at 1080p

[thunderhawk]

things are actually more complicated about the recording...

as far as I know, recording of BD media:
25 GB -> 1hours
50 GB -> 2hours
in HDTV, 720p if i'm not mistakin...

But, these times where released when the BD only supported MPEG-2 coding.
Many dont seem how important codecs are but I do.

How many hours of 720p encoded in MPEG-4 H.264 can I record on a 50 BD?
How many hours of 1080p encoded in MPEG-4 H.264 can I record on a 50 BD?

It would be nice if someone knew the answers...


THE parameter when you want to record something on BD: what codec and what bitrate? (the ratio and other... will be automatically chosen I hope)

[Rob]

I thought 50GB gave 4.5hrs of hi-def pictures.

[Blu-Wave]

Using MPeg2 at 24Mbps with highly compressed audio (around 700kbps) typically gives around 4.5 hours of 1080p24 on a 50GB disc. A more powerful compression algorithm such as MPeg4 should give broadly similar rewults at around 16Mbps, but there are several image stability issues with fractal-type material and camera motion.

16Mbps MPeg4 1080p24 plus 8Mbps 5.1 audio would give around 4.5 hours of good quality sound and vision with most source material on a 50GB disc - although with a fastr drive and apprpriate media, etc. around 2 hours with very high qualiy sound and vision would be possible - DSD (1/2822) or PCM (24/192) in 10.2 or better, with "God" and floor speakers, for example - could make a great concert...

Highly complex and non-realtime compression techniques could pitentially provide around 4 hours of very high quality pre-recorded material on a 50GB disc, DSD10.2 audio and 1080p24 video, for example.

[philip2005]

When Blu-Ray comes out and HDTV will we get rid of the PAL & NTSC nonsense so we don't have discs from different regions?

[zombie]

Originally Posted by philip2005

When Blu-Ray comes out and HDTV will we get rid of the PAL & NTSC nonsense so we don't have discs from different regions?

PAL & NTSC will be gone but they'll be replaced by different types of HDTV. Just like it was for SDTV, Europe and Australia use a different type of HDTV than North America and Japan. I also feel quite certain region coding will still exist as well.

[Gorkab]

Originally Posted by philip2005

When Blu-Ray comes out and HDTV will we get rid of the PAL & NTSC nonsense so we don't have discs from different regions?

It's marketing... There will always be this nonsense of regions...

[Knight-Errant]

That means as a UK resident I have to wait for a viable multiregion solution if I want to watch american discs

My DLP projector can handle 1080i and I was hoping this would form a good stopgap solution until I could upgrade to 1080p but if there will still be compatibility problems similar to NTSC/PAL then I foresee a headache in my future :?

Took me ages to find equipment that could cope with NTSC progressive scan too....

Thing is, I really love my american discs. I like the correct playspeed (I can tell the difference) as well as unrated editions etc.

[Blue]

There seems to be a bit of confusion with Digital standards. Although there are digital standards closely emulating PAL and NTSC. The HD standards are the same.

The differences are in the broadcast standards so a tuner designed for one group of countries will not work in another group, however I think multi region tuners will appear as it is much more cost effective to have one production run, this will require an additional couple of cheap components or a smarter design, the only other problem was voltage and frequency, that has been resolved with switch mode power supplies.

Most display devices (rear projection TV, Projectors, LCD, plasma and even some CRT monitors) can down / up code to the differing SD standards and many of the HD standards. The difference is how the signal is broadcast free to air (and probably cable). Here there are differences that make tuners in different countries incompatible. The 1080p / 720p conversion is not a great concern as many display devices can down convert. I’m sure the Players will offer the same function. I think the issue between countries will be DRM (Digital Rights Management) get used to that acronym – It’s going to cause much discussion in the coming months.

If the rumours are true about Blu Ray and DRM, I’m buying shares in Symantec - anyone for Norton Anti Virus for Blu Ray! It will be how long, NOT if, before viruses are killing Blue Ray players. If they must be connected to the internet WOW I give the hackers 8 weeks from the first domestic release of a Blu Ray player to when a virus/'s will be out and about killing them, unless this “feature” is shrouded in encryption, then add a few more weeks delay until the attack. I think the hackers will force the manufacturers to back down from the automated kill the BIOS trick if they are stupid enough to implement it in the first place, software providers likewise if they can kill their Blu Ray Disc’s.

[thunderhawk]

Oh really?

Then its back to the analog era for me 8) :lol: