MMCOMPRESS Field - ulFlags

ulFlags (ULONG)

Some flags are set to instruct the I/O or CODEC procedure to act. Some flags are status returned from the I/O or CODEC procedure.

MMIO_IS_KEY_FRAME

This bit is set by the application to instruct the I/O procedure to compress the pSrcBuf into a key or reference frame. If the bit is not set, a delta frame is compressed.
MMIO_IS_PALETTE
A video palette is provided. Set by the application.

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