Adtec digital EN-20 (version 2.03.06) Manual - Manual (Page 21)

recommended to set AFD to WSS if
Aspect Ratio is WSS.
AFD Active Format Descriptor is data
that can be sent in a MPEG video
stream that provides information
about the aspect ratio and picture
characteristics within the stream for
cropping/letter boxing by
downstream devices. The
configuration can be set to OFF,
WSS for AFD ‘passthrough’ or
manually set.
OFF
WSS
2 - 11
*.ECMD# AFD
View AFD API
documentation for
further details of
arguments 2-11
GOP Type GOP Type can be set to open or
closed. An OPEN GOP uses
referenced pictures from the
previous GOP at the current GOP
boundary. A CLOSED GOP starts
with an I Frame and subsequent B
Frames do not rely on I or P frames
from the previous GOP.
OPEN
CLOSED *.ECMD# GOP
GOP Structure GOP Structure sets the format
Group-of-Pictures will use; the
order of interframes and the various
types of picture frames that will be
used.
IBBP
IBP
IP
I
*.ECMD# GOP
GOP Size GOP Size is the distance between
two full image frames (I-Frames) in
a GOP Structure.
1 - 30 *.ECMD# GOP