Mux Subtitles After Editing VOB

[Video Dude]

I reauthored a movie only dvd with 1 audio and 1 subtitle.
I used PGCDemux to demux one cell chapter from the middle (video, audio, subpics, log)
I did edits to the video and was ready to use MuxMan and then replace the chapter cell back into the dvd using VobBlanker.


But using PgcEdit, I see the original DVD subtitle structure is:

0 [ 0 0 6 0 ]

4:3 Grayed out
wide 0x20
letterbox 0x26
pan&scan Grayed out




But using MuxMan I can only get:

0 [ 0 0 1 0 ]

4:3 Grayed out
wide 0x20
letterbox 0x21
pan&scan Grayed out




How can I correctly mux the subtitle to [ 0 0 6 0 ] so I can replace the chapter with VobBlanker?


PGCDemux demuxed:
Subpictures_20.sup
Subpictures_26.sup
Looking with DVDSubEdit 20 is wide, 26 is letterbox.

Final subtitle result shown in PgcEdit should be:

0 [ 0 0 6 0 ]
1 none
2 none
3 none
4 none
5 none
6 none
.
.
.

[Video Dude]

I came up with a possible solution. It seems to work in WinDVD and DVDSubEdit. But is it valid for standalone players?

Muxman:
1: Subpictures_20.sup
2: Dummy_21.sup
3: Dummy_22.sup
4: Dummy_23.sup
5: Dummy_24.sup
6: Dummy_25.sup
7: Subpictures_26.sup

View in PgcEdit:
0 [ 0 0 0 0 ]
1 [ 0 1 1 0 ]
2 [ 0 2 2 0 ]
3 [ 0 3 3 0 ]
4 [ 0 4 4 0 ]
5 [ 0 5 5 0 ]
6 [ 0 6 6 0 ]

Disable and Edit in PgcEdit:
0 [ 0 0 6 0 ]
1 none
2 none
3 none
4 none
5 none
6 none

Then replace the original chapter cell with the MuxMan vob using VobBlanker. The new vob will match the subtitles structure 0 [ 0 0 6 0 ].

[Sir Didymus]

Hi Video Dude.

Considering the mux perspective, one difference of you original cell with the reauthored one is that the sub streams 1..5 are physically not present in the vobs, while in the process you are applying the dummies are surely present. After the PgcEdit correction this should have no consequences in terms of playback.

A different (more serius) problem is the following.

In your situation, more than the streams, I would pay attention to the audio (and video): please note that the cell flags play here a fundamental role. Since you are talking about "a chapter", I assume you are substituting a cell in the middle of a title, where - most probably - the original seamless playback joint is marked.

If this is the case, in the original mux the initial audio packets of the cell you are editing belong to the previous cell. By making the substitution of the cell with VobBlanker you can not avoid to get it unmarked, and to obtain potential discontinuities at the cell boundaries.

Also, in the demux process, at least one audio frame (32 ms of audio if AC3) risk to be corrupted at the cell boundaries; as a consequence some further specific attention should be payd to keep a precise a/v synchronisation...

In your situation I would recommend to perform the reauthoring process (demux/edit/remux/VB_process) at the whole title level and not at the cell level...

IMHO, of course...

Cheers,
SD

[Video Dude]

Thanks for the reply.

I think you are right. I did not a notice any sync problems, but there is a definite slight video pause at the beginning of the chapter following the replacement with the sound of the laser refocus.