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Video Dialog Boxes
Each capture driver can provide up to four dialog boxes to control aspects of
the video digitization and capture process, and to define compression
attributes used in reducing the size of the video data. The contents of these dialog
boxes are defined by the video capture driver.
The Video Source dialog box controls the selection of video input channels and
parameters affecting the video image being digitized in the frame buffer. This
dialog box enumerates the types of signals that connect the video source to
the capture card (typically SVHS and composite inputs), and provides controls to
change hue, contrast, or saturation. If the dialog box is supported by a video
capture driver, you can display and update it by using the WM_CAP_DLG_VIDEOSOURCE message (or the capDlgVideoSource macro).
The Video Format dialog box controls selection of the digitized video frame
dimensions and image-depth, and compression options of the captured video. If the
dialog box is supported by a video capture driver, you can display and update
it by using the WM_CAP_DLG_VIDEOFORMAT message (or the capDlgVideoFormat macro).
The Video Display dialog box controls the appearance of the video on the
monitor during capture. The controls in this dialog box have no effect on the
digitized video data, but they might affect the presentation of the digitized signal.
For example, capture devices that support overlay might allow altering hue and
saturation, key color, or alignment of the overlay. If the dialog box is
supported by a video capture driver, you can display and update it by using the WM_CAP_DLG_VIDEODISPLAY message (or the capDlgVideoDisplay macro).
The Video Compression dialog box controls the post-capture video compression
attributes. If the dialog box is supported by a video capture driver, you can
display and update it by using the WM_CAP_DLG_VIDEOCOMPRESSION message (or the capDlgVideoCompression macro).
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