The CDCIDescriptor has a VerticalSubsampling
property, and Get/Set methods exist in its COM
However, no VerticalSubsampling format specifier exists
in AAFEssenceFormats.h and the CDCI codec does not
support non-unity vertical subsampling. Comments in
CAAFCDCICodec.cpp recognize the lack of vertical
V101 specifies the values one and two as valid vertical
subsampling values. Indeed, a vertical subsampling
value of 2 is required to represent 4:2:0 chroma
subsampling. Also DVXpress 3.0 generates AAF files
that use a vertical subsampling of 2.
Two things need to be fixed:
1) The format specifier should added
2) The CDCI codec should be modified to support non
unity vertical subsampling.