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MCP-601 Control Command Codes 2.0

POSITION:VIDIN

POSITION:VIDEOIN

Determines what part of the incoming video data will be acquired and

passed on to be keyed and/or mixed with graphics.

SYNTAX POSITION:VIDIN <left x>,<top y>,<right x>,<bottom y>

POSITION:VIDIN ?

POSITION:VIDIN <left x>,<top y>,<right x>,<bottom y>

POSITION:VIDIN ?

ARGUMENTS 0 – 719 for x The values are in pixels.

0 – 479 for y while in NTSC. The values are in lines.

0 – 571 for y while in PAL. The values are in lines.

The upper limit for y is determined by the detection of NTSC or PAL

from the incoming video. The MCP601 will limit the coordinates to

fit with-in the limits of the detected video.

By using both the POSITION:VIDOUT/VIDEOOUT and POSITION:VIDIN/VIDEOIN

commands, scaling (“video push”) of the video image can be preformed.

The scaling ratio is defined as follows:

horizontal: (VIDOUT <right x> - VIDOUT <left x>)

------------------------------------

{ VIDIN <right x> - VIDIN <left x> )

vertical: (VIDOUT <bottom y> - VIDOUT <top y>)

------------------------------------

{ VIDIN <bottom y> - VIDIN <left y> )

The scaling ratio cannot be greater then 1.05 to 1.10 or no greater

then 5% to 10% zoom. If the zoom is too great, the video image will

freeze. Reduce the zoom to regain a live image.

RELATED COMMAND

POSITION:VIDIN/VIDEOIN

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