Chapter 3 ’Web User Graphical Interface’ — Workflow Library
316 Electra VS
-
Version 05.10
User Manual - Rev. A
Display Aspect Ratio
: leave to
Auto
to compute automatically the
display aspect ratio from the input video one and take into account the
video processing you may have added (clipping, for example). If you
want to force the ratio, enter it manually in the editable list (for
instance: 16:9 and 1.33).
I period
: maximum size of the GOP.
P period
:
-
1
if the GOP contains no B frame
-
2
if a B frame is present between each P frame
-
3
if two B frames are present between each P frame
- etc.
Hierarchical GOP
: if set to
true
the use of B pictures as a reference
is allowed
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.
Closed GOP Period
: GOP period after which the encoder creates a
closed GOP.
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.
Custom
: configure manually the decoder delay and the coder
delay:
- Decoder delay
: this parameter is associated to the
decoder buffer. Increasing this delay improves the quality.
However, the zapping time is longer.
To Next Page
Loading...