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Sorry, I mean null PGC duration. A dummy PGC has a duration of 0:00:00.00, but at a specific PAL or NTSC frame rate. Right?
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Aaah - now I know what you are talking about (my lousy english)
Byte 0x04 in PGC description
For the first play (cant have content) in PAL is always 64 (0x40) and for NTSC 192 (0xC0)
To the video attrinbutes
0 in byte 0x100 does not indicate MPEG1, NTSC, 4:3, PS, Letterboxed etc, it indicates "no VOB present"
Just look at the represented values
You will never get 0 with a VOB present, because 4:3 and PS/Letterbox not possible together, 720x480 and MPEG 1 not possible together and so on