You can control the Encoder, Record, and Stream Out configuration from the GUI (see
This Figure
and
Table: Encoder Parameter Panel Settings
). Settings options are enabled when the pipeline is in the stop state.
Figure 3-10:
Encoder Parameter Panel
|
X-Ref Target - Figure 3-10
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Table 3-3:
Encoder Parameter Panel Settings
|
Encoder Parameter
|
Setting
|
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Encoder
|
This can be either H264 or H265.
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|
Profile
|
The standard defines a sets of capabilities, which are referred to as profiles, targeting specific classes of applications. These are declared as a profile code (profile_idc) and a set of constraints applied in the encoder. This allows a decoder to recognize the requirements to decode that specific stream.
H264 supports Baseline, Main, and High profile. In H265, only the Main profile is supported.
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|
QP
|
Quantization in an encoder is controlled by a quantization parameter. It specifies how to generate the QP per coding unit (CU). Two modes are supported:
•
Uniform: All CUs of the slice use the same QP
•
Auto: The QP is chosen according to the CU content using a pre-programmed lookup table.
|
|
Rate Control
|
Selects the way the bit rate is controlled:
CBR: Use
constant bit rate
control.
VBR: Use
variable bit rate
control.
LOW_LATENCY: Use variable bit rate for low latency application.
|
|
Bitrate
|
Encoding bitrate. In digital multimedia, bitrate often refers to the number of bits used per unit of playback time to represent a continuous medium such as audio or video after source coding (data compression).
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B-frame
|
Short for bidirectional frame or bidirectional predictive frame, a video compression method used by the MPEG standard. The setting ranges from 0 to 4.
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Slice
|
Number of slices produced for each frame. Each slice contains one or more complete macroblock/CTU row(s). Slices are distributed over the frame as regularly as possible. If slice size is also defined, more slices can be produced to fit the slice size requirement.
Range:
•
4-22 4K resolution with HEVC codec
•
4-32 4K resolution with AVC codec
•
4-32 1080p resolution with HEVC codec
•
4-32 1080p resolution with AVC codec
|
|
GoP Length
|
In video coding, a group of pictures, or GoP structure, specifies the order in which intra- and inter-frames are arranged. And GoP Length is a length between two intra-frames. The GoP is a collection of successive pictures within a coded video stream. Each coded video stream consists of successive GoPs from which the visible frames are generated. Its range is from 1– 1000. The GoP length must be a multiple of B-Frames+1.
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Filler Data
|
Filler data network abstraction layer (NAL) units for CBR rate control. It can be enabled or disabled. Applies to CBR mode only.
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L2 Cache
|
Enable or disable L2cache buffer in the encoding process.
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Latency Mode
|
Encoder latency mode. It can be normal or sub_frame mode.
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Low Bandwidth
|
If enabled, decreases the vertical search range used for P-frame motion estimation to reduce the bandwidth.
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GoP Mode
|
Group of Pictures mode. It can be Basic, low_delay_p, or low_delay_b.
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