Sensoray 512 DOS - Manual (Page 16)

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DroppedFrames Contains the number of frames that could not be compressed.
When the video queue is not emptied at a sufficiently high rate,
the compression engine stalls and begins dropping frames. This
value is update after any command including
X12_VI_GETSTATUS.
Length Length of MPEG buffer data to be transferred to/from the video
queue. Length must be set before executing either
X12_VI_GETDMADATA or X12_VI_PUTDMADATA. After the
execution of these commands Length contains the actual
number of bytes transferred.
FrameCount Contains the number of frames compressed during encoding.
This value is updated after any command including
X12_VI_GETSTATUS.
Status After the execution of a command Status should be checked
to verify that the command was executed successfully.
Value Description
SUCCESS Command completed
successfully
FAIL Command failed
Buffer This is a far pointer (32-bit real mode ‘segment:offset’ pair) to the
local MPEG buffer. The buffer is used to transfer MPEG to/from
the 512 video queue.