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The WM_CAP_DLG_VIDEOCOMPRESSION message displays a dialog box in which the user can select a compressor to use during the capture process. The list of available compressors can vary with the video format selected in the capture driver's Video Format dialog box. You can send this message explicitly or by using the capDlgVideoCompression macro.

wParam = (WPARAM) 0; 
lParam = 0L; 

Return Value

Returns TRUE if successful or FALSE otherwise.


Use this message with capture drivers that provide frames only in the BI_RGB format. This message is most useful in the step capture operation to combine capture and compression in a single operation. Compressing frames with a software compressor as part of a real-time capture operation is most likely too time-consuming to perform.

Compression does not affect the frames copied to the clipboard.


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]



See also

Video Capture
Video Capture Messages