Pioneer DVD-V8000 - Manual (Page 21)

Operating Modes
4.8 Start Timing Under Synchronized Playback (with several players)
To synchronize each playback to External Reference Sync Signal among several
players, issue the PL command after all players have finished the Search. The
next chart indicates the when to issue the PL command.
SE <CR>
R<CR>
PL<CR>
> 300 msec
When the player executes a Search (SE command) and it returns a completion
message, there is a brief period when the player ignores a PL command. Issue a
PL command at least 300ms after the command completion.
After issuing a PL command, there may be a brief period before synchronized
playback starts. If all players receive a PL command after a Search but before
the PLAY command is issued (see following example), then playback is
synchronized after a pause of approximately four fields which is less than one
Frame in length.
When the player receives a PL command during the Unspecified Area (see
below), the playback might start at the timing A field, or it might start at the timing
B. Thus, this playback location is called an Unspecified Area.
Only the PL command under external synchronization, is executed during the V
sync timing.
Example:
Playback
start
2nd field
1st field
4 fields Waits PLAY
command Unspecified
area, 7msec
Ext.Sync.
field condition
A B
The video output under external synchronization delays for one field to the black
burst signal input to EXT SYNC IN terminal. In the above figure, the field of black
burst at the playback start timing is second field, but the field of the video output
from DVD-V8000 is first field.
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