ulPelFormat (ULONG)
For MCI_GETIMAGEBUFFER, the valid pel format values for hardware include the default format of the card or an OS/2 bitmap. For a movie, the only valid value is RGB or an OS/2 bitmap.
This field is input for MCI_SETIMAGEBUFFER, and output for MCI_GETIMAGEBUFFER.
If a palettized format is requested, the currently defined palette will be supplied by MCI_SETIMAGEPALETTE.