Notifies a video capture driver to stop a video stream.
dwParam1, dwParam2
Not used.
When a device receives this message, it marks the current buffer as done and retains any empty buffers remaining in the queue. For the buffer marked as done, the device places the actual length of the data in the dwBytesUsed field of the VIDEOHDR structure.
If the input is not started, this message has no effect and the device driver returns DV_ERR_OK.