Harmonic ELECTRA VS, Руководство пользователя, Страница: 318 / 604

Chapter 3 ’Web User Graphical Interface’ — Workflow Library
318 Electra VS - Version 05.10
User Manual - Rev. A
H.265 HEVC Hardware Encoder
Hardware encoding of HEVC UHD. You shall use this module only if you
have the additional accelerator board for UHD encoding installed
(ELC-VS-HW-UHD).
Figure 3-288. H.265 HEVC hardware encoder parameters
For this processing component, you must set the following parameters:
 Bitrate
(only for CBR): enter the bit rate value (without encapsulation
overhead), in bits per second.
 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
 4 if four B frames are present between each P frame

8 if eight B frames are present between each P frame
 GOP Type : if set to IB image, no P image will be present in the output
stream. Usually, IB is used for UHD resolution and IPB is used for HD
resolution.
 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.

Temporal Scalability : Used to enable ( true ) or disable ( false ) the
temporal scalability. When Temporal Scalability is true, the number of
sub-layers depends on the P period:
 If the P period is 2, then there are 2 sub-layers
 If the P period is 4, then there are 3 sub-layers
 If the P period is 8, then there are 4 sub-layers