Measuring Video Quality
One way to measure video quality is to limit the number of captured frames
dropped during the capture operation. When streaming capture has finished, the
quality value is compared with the ratio of dropped frames to total frames. If the
percentage of dropped frames is greater than the value of the
wPercentDropForError member of the
CAPTUREPARMS structure, AVICap sends an error message to the error callback function if it
is installed.
You can retrieve the current limit of dropped frames (expressed as a
percentage) by using the
WM_CAP_GET_SEQUENCE_SETUP message (or the
capCaptureGetSetup macro). You can set a new limit by specifying a percentage as the value of
the
wPercentDropForError member of the
CAPTUREPARMS structure, and then sending the updated structure to the capture window by
using the
WM_CAP_SET_SEQUENCE_SETUP message (or the
capCaptureSetSetup macro). The default value of
wPercentDropForError is 10 percent.
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