Chapter 3 ’Web User Graphical Interface’ — Workflow Library
312 Electra VS
-
Version 05.10
User Manual - Rev. A
Rate Control Quality
: set the picture quality level required, in
percentage. The value must be between 10 and 90% (best
quality). Default value: 70%.
It is not possible to use values outside of the bitrate range, and
it is not recommended to reduce the bitrate range.
Bitrate
(only for CBR): enter the bit rate value (without encapsulation
overhead), in bits per second.
Profile
: select from the drop-down list the profile you wish to apply:
Baseline
: simplest profile in H.264; B pictures and CABAC are
not encoded. It is used for low resolutions.
Main
: generally used for SD resolutions.
High
: generally used for HD resolutions.
For
Main
and
High
profiles, also set the following parameters:
- Frame structure
: choose from the drop-down list the way
you want to handle interlaced streams. Possible options
are:
- Progressive
: the whole frame is encoded. This mode is
suitable for 720p and Web TV.
- Interlace
: fields are encoded separately. This mode is
suitable for SD and 1080i.
-
Adaptive
: the video is encoded in Picture-Adaptive
Frame/Field (PAFF) mode, which means that depending on
the nature of the incoming image, frames or fields are
encoded. This mode is useful when the content in input is
likely to vary. This mode is suitable for SD and 1080i, but
not in a Web TV context.
Make sure that the
Frame structure
parameter respects
the format of the input connected to the
H.264 AVC
encoder
processing component.
- 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.
If you set the minimum bitrate to a lower value than the minimum
value of the range, the value applied is the minimum value on the
range, and inversely for the maximum bitrate.
The
adaptive
mode uses more CPU than the other modes.
Consequently, you can make less H.264 encodings on a machine in
this mode.
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