Subtitles "vanish" at marker (i.e., angle) -- flaw in DVD-Spec?

[LB]

What's the deal with subtitles vanishing when they cross a marker (i.e., either start or end of an angle)?

Example:

Subtitle start @ 1:01
Subtitle end @ 1:06
Marker (i.e,. angle/asset) @ 1:03

Upon playback, the subtitle asset will dissappear upon crossing the marker at exactly 1:03 irregardless of what angle (i.e., asset) is chosen.

[mpucoder]

That's because subpictures cannot span cells. And a new angle, or the end of an angle block, not only is a new cell, but a new VOB. Each VOBU contains pointers to the start of the related subpictures. To which angle would the pointers point?

[LB]

Originally posted by mpucoder
That's because subpictures cannot span cells. And a new angle, or the end of an angle block, not only is a new cell, but a new VOB. Each VOBU contains pointers to the start of the related subpictures. To which angle would the pointers point?

Is it really true that each new cell is a new vob? When I compile the DVD all the assets in the "movie" are (1) VOB.

[mpucoder]

Originally posted by LB
Is it really true that each new cell is a new vob?
No. A vob can have as many as 255 cells.
When I compile the DVD all the assets in the "movie" are (1) VOB.
Then you do not have angles. But maybe we are not using the term VOB the same way. A VOB is a video object, identified by its VobID, not a file. Each angle must be a seperate VOB, as well as the non-angled material that preceeds or follows the angles.

[LB]

Originally posted by mpucoder
Then you do not have angles. But maybe we are not using the term VOB the same way. A VOB is a video object, identified by its VobID, not a file. Each angle must be a seperate VOB, as well as the non-angled material that preceeds or follows the angles.

Gotcha. I was talking .vob file extension. Has anyone created a program which will analyze the angle locations and split the subtitles accordingly (i.e., cut the subs so they appear before and after the new cell)? That sure would be handy.