RECORDTAB Field - ulParm1

ulParm1 (ULONG)

Data record specific data. This field can return one of the following flags on an MMIOM_MULTITRACKREAD message:

MMIO_IS_KEY_FRAME

The data record contains a key or reference frame.
MMIO_IS_PALETTE
The data record contains a video palette. This data record is not considered a video frame.
MMIO_INVISIBLE_FRAME
The data record contains a video frame that should not be displayed. This flag is part of the seek support for movies. It allows a movie to be seeked to a non-reference frame. This frame needs to be decoded, but should not be displayed.
MMIO_NULL_FRAME
The data record contains a video frame of zero length. Some file formats contain these zero length video frames, or null frames, as filler for frames missed during capture of the movie, especially during real-time capture.

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