MMEXTENDINFO Field - ulFlags

ulFlags (ULONG)

Specifies the following flags:

MMIO_TRACK

If set, all MMIO operations will be performed on the active track specified in the ulTrackID field.
MMIO_RESETTRACKS
If set, turns off the active track number; track 0 is used as the current track.
MMIO_REVERSE_READ
Reserved for future use.
MMIO_SCAN_READ
If set, all MMIO operations will be performed in scan mode, meaning only key video frames are processed.
MMIO_NORMAL_READ
If set, all MMIO operations will be performed in Normal mode, which processes all frames.
MMIO_CODEC_ASSOC
If set, the pCODECAssoc and ulNumCODECs fields are used for setting the active CODECs or returning the CODEC information.

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