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The First-Play PGC is a major DVD data structure that can be read from the file position at 1024 relative to the beginning of the VIDEO_TS.IFO file. The following table shows the contents of the First-Play PGC of the provided title.

First-Play Program Chain (PGC)
Offset Bytes Description Value
0 2 Reserved  
2 1 Number of programs in this PGC 0
3 1 Number of cells in this PGC 0
4 1 Playback time (hour) 0
5 1 Playback time (minute) 0
6 1 Playback time (second) 0
7 1 Playback time (frame) 192 (0/30 fps
NTSC)
8 4 Prohibited operations 0
12 2 Audio stream 1 status 0
14 2 Audio stream 2 status 0
16 2 Audio stream 3 status 0
18 2 Audio stream 4 status 0
20 2 Audio stream 5 status 0
22 2 Audio stream 6 status 0
24 2 Audio stream 7 status 0
26 2 Audio stream 8 status 0
28 4 Sub-picture stream 1 status 0
32 124 Sub-picture stream 2-32 status 0
156 2 Next PGC number 0
158 2 Previous PGC number 0
160 2 GoUp PGC number 0
162 1 Still time in seconds 0
163 1 Program playback mode 0, sequential
164 4 Color 0 (0, Y, Cr, Cb) 0
168 60 Color 1-15 0
228 2 Start byte of PGC command table 236
230 2 Start byte of PGC program map 0
232 2 Start byte of PGC cell playback information 0
234 2 Start byte of PGC cell position information 0
PGC command table following
236 2 Number of pre-commands 1
238 2 Number of post-commands 0
240 2 Number of cell commands 0
242 2 End byte address of command table 15
PGC commands (pre, post, and cell) following

The use of each of the fields defined in the above data structure will be explained in details later in this guide. In general, the First-Play PGC is an empty PGC with no programs and no cells and contains pre-commands to link to the first video clip that resides either in the Video Manager or to a title or a root menu of a different Video Title Set. The First-Play PGC of the provided DVD project contains only a single pre-command JumpTT 1 (Jump to title 1) that begins the playback of the video title 1.

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