Adtec EN-91 User Manual page 22

Latency It is dependent upon the video
rate, frame size/rate
(NTSC,PAL,HIGH-DEF) and GOP
structure. Long IBBP GOPs will
produce higher latency over short
IP GOPs. Short IP GOPs at lower
bit rates produce lower quality
video.
Latency Trim Use this setting in conjunction with
the Latency setting to fine tune the
latency in order to match various
manufacturers latency settings.
The setting is rounded down and
applied in video frame multiples (a
+50 mSec offset would result in
the following.. one additional frame
delay with 29.97 frame material
and two additional frame delays
with 59.94 frame material).
Fault Mode The user can select encoder
behavior video loss. The encoder
can stop encoding, encode black,
or generate a combination of
Black, Bars, Tones and Service ID.
Fault Allows the operator to select what
Resolution resolution to encode at during fault
mode.
Aspect Ratio Aspect Ratio is the ratio of
horizontal lines to vertical lines in
the encoded image.Options are:
- Wide Screen Signaling (WSS)
reads incoming WSS flag and
adjusts aspect ratio accordingly.
- 4 X 3 defaults standard definition
to 4 X 3 display.
LONG: Latency will measure close to
1 second.
NORMAL: Should be used for
distribution and standard
contribution transmissions. Latency
is approximately 1/2 second.
LOW: Latency is approximately 3
frames less than NORMAL.
VERYLOW: Latency is approximately
5 frames less than NORMAL.
3FRAME/2FRAME/1FRAME
Feature keyed option that provides
super low end-to-end latency when
paired with an RD-60/RD-70. GOP
settings are ignored.
Interoperability with other vendor
decoders is not guaranteed in these
modes.
Max range is -400 to +200 and is
constrained based on the
ENCODELATENCY" setting
(NORMAL) and current video mode.
OFF
BARS
BARSTONES
BARSOVERLAY
RASTONESOVERLAY
480I59.94
576I50
720P59.94
720P50
1080I59.94
1080I50
4x3
16.9
WSS