Chapter 3 ’Web User Graphical Interface’ — Workflow Library
Electra VS
-
Version 05.10 313
User Manual - Rev. A
- Hierarchical GOP
: if set to
true
, B frames can be used as
references.
- Closed GOP period
: set to 0 for no periodicity, 1 means
every GOP, 2 means every second GOP, etc.
Level
: select from the drop-down list the level you wish to apply:
Auto, 1, 1.1, 1.2, 1.3, 2, 2.1, 2.2, 3, 3.1, 3.2, 4, 4.1, 5, 5.1
Mode
: select an encoding mode:
Premium
: this encoding mode provides the best video quality.
High-density
: this encoding mode provides the best density (it
uses less CPU and thus allows to perform more encodings).
Display Aspect Ratio
: if set to
Auto
, then the display aspect ratio
is automatically computed from the input video one and taking into
account the video processing you may have added (clipping, for
example).
Select
Auto (DVB restricted)
to force the aspect ratio
(
Aspect_ratio_idc
parameter in the H.264 stream) to a value
compatible with ETSI TS 101 154 V1.11.1.
If you want to force the ratio, enter it manually in the editable list (for
instance: 16:9 and 4:3).
I period
: maximum size of the GOP.
Adaptive GOP
: if set to
false
, GOPs always have the same structure.
If set to
true
, the scene cut detection feature is used and the GOP
structure is modified consequently. Adaptive GOP is always the best
choice regarding video quality, even for Web TV adaptive bitrates.
Delay
: this parameter can have the following values:
Standard
: the decoder delay is set to 1.5 second, and the coder
delay is set to
Standard
. This mode is a good trade-off between
latency and video quality.
Short
: the decoder delay is set to 1 second, and the coder delay
is set to
Short
. This mode decreases the latency and the zapping
time.
Ultra-short
: the decoder delay is set to 800 ms, and the coder
delay is set to
Ultra-short
. This mode gives the lowest latency
and the lowest zapping time, but the video quality is impacted.
Web TV
: the decoder delay is set to 4 seconds, and the coder
delay is set to
Standard
. This mode can be used for Web TV,
when the latency is not a major concern: it can increase the
video quality.
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