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HDMV vs BDJ

4 replies [Last post]
francoislionet
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Joined: 2008-01-13

Hello,

I have read that a BluRay disc could be either HDMV or BDJ. But here in the forum, I see people talking about mixed discs.
What is the truth? Can you start the menus in HDMV and launch a BDJ application, and then return to HDMV when the application is over? Or do you need to program everything in BDJ?

Sorry for this stupid question, but I am beginning!

Francois

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Bill Foote

bd-j-dev@mobileandembedded.org wrote:
> OK after rereading other thread I think I have the answer to my question. You CAN have mixed titles. This is cool.
> But what is the memory available to the BDJ on a basic BluRay player when you have a HDMV menu? Does the HDMV menu take a lot of space?
>

The two don't run at the same time, so it's not an issue. When you run
an HDMV title, all BD-J apps are shut down, and when you run a BD-J
title, no HDMV runs.

Bill

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francoislionet
Offline
Joined: 2008-01-13

OK after rereading other thread I think I have the answer to my question. You CAN have mixed titles. This is cool.
But what is the memory available to the BDJ on a basic BluRay player when you have a HDMV menu? Does the HDMV menu take a lot of space?

Francois

francoislionet
Offline
Joined: 2008-01-13

All right, I am answering to myself.

I am really sorry, I found my previous post. And someone did answer to it. Please forgive me, I'll be more careful next time, and I wont polute the forum anymore.

But my question still stands about memory. What is the memory available when you launch a BDJ app from an HDMV menu? I am really worried about space...

Francois

bddeveloper
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Joined: 2008-01-14

The HDMV has a limited spec, all images you see for an HDMV menu are only 256 colors they can include alpha and are stored as 8-bit images that are muxed into the MPEG-2 Streams. Images can't overlay on top of each other so you are limited to the size of the screen of 1920x1080. This is a completely different part of the players memory. Think of HDMV working exactly like DVD just with more commands and features.