DVD menu subpicture problem in BD players

[keatonatron]

Hello all,

I've run into a very specific problem which I'm curious about.

I authored a complete DVD with Scenarist, and tested it on a few DVD players and a playstation 3, everything worked flawlessly.

However when I tried it on two bluray players, the subpictures for one menu failed to appear. I could move the cursor (blindly) and make selections, but I couldn't see what I had selected. All other menus worked fine on the bluray players.

I recall a similar problem with a single menu's subicture not working, where I ended up opening the subpicture file in photoshop, simply resaved it with a different name and re-imported it into Scenarist, and that solved the problem.

However this is the first time I've seen the problem only on bluray players (on all bluray players, other than PS3), and not on any DVD players.

Does anyone know anything about the way players actually interpret subpicture data? Is it possible that a small bug in the data could cause some players to not understand the file at all?

Thanks!

[keatonatron]

I found something that fixed the problem. The subpicture in the problem menu was set to appear a few frames after a chapter point. The other non-problem menus had their subpictures starting exactly on the chapter points.

It would appear blu ray players have a problem with this, but DVD players don't. After adjusting the subpicture to start exactly on the chapter point, the problem was fixed.

I have done a few problem-free DVD's where the subpicture starts a few seconds after the beginning of the video and there is no chapter point--I guess it's only a problem when the subpictures start close to, but not exactly on, a chapter point.

[Ghitulescu]

Thanks for noticing this issue.

Could you post a snippet of your DVD (with dummy VOBs for main titles) for other people to test on their own players?

[keatonatron]

For confidentiality reasons I can't post the actual DVD, but I could maybe recreate the problem with all dummy material, of people are interested in testing it out.

[Ghitulescu]

For confidentiality reasons I can't post the actual DVD, but I could maybe recreate the problem with all dummy material, of people are interested in testing it out.Could you post a snippet of your DVD (with dummy VOBs for main titles) for other people to test on their own players?

That is exactly why I suggested to use dummy titles.