MCI_STEP

Steps the player one or more frames.

DWORD lParam1

The following flags apply to all devices supporting MCI_STEP:

MCI_NOTIFY	Specifies that MCI should post the MM_MCINOTIFY message when this command completes. The window to receive this message is specified in the dwCallback member of the structure identified by lpStep.
MCI_WAIT	Specifies that the step operation should finish before MCI returns control to the application.

The following additional flag for lParam1 applies to animation devices.

MCI_ANIM_STEP_FRAMES	Indicates that the dwFrames member of the structure identified by lpStep specifies the number of frames to step.
MCI_ANIM_STEP_REVERSE	Steps in reverse.

Note that lParam2specifies a far pointer to the MCI_ANIM_STEP_PARMS structure.

The following additional flag for lParam1 applies to videodisc devices.

MCI_VD_STEP_FRAMES	Indicates that the dwFrames member of the structure identified by lParam2 specifies the number of frames to step.
MCI_VD_STEP_REVERSE	Steps in reverse.

Note that lParam2 specifies a far pointer to the MCI_VD_STEP_PARMS structure.

Only devices that return TRUE to the MCI_GETDEVCAPS_HAS_VIDEO capability query support this command at present.