XVC-ULTRA Encoder
User’s Guide
Page 20 of 50
The fields appearing on the page are described in the table below.
Table 11: Channel Settings Field Descriptions
Field
Description
Video Encoder Settings
Compression
Video compression scheme, AVC(H264) or HEVC(H.265).
Resolution
The resolution of the encoded video:
•
Follow input -
Encoding resolution will be the same as the video source.
•
Scale input
– Encoding resolution will be a scaled (up/down) version of the input resolution.
o
In ‘scale input’ mode, the width and height of the scaled resolution should be set.
Pixel depth
The number of bits used to specify each color component (Y, Cb, Cr) of a pixel:
•
8 Bit/pixel
– Each component is represented using 8 bits.
•
10 Bit/pixel
– Each component is represented using 10 bits.
Color format
The chroma subsampling scheme used to compress video transmissions.
•
4:2:0
– The video is compressed using 4:2:0 color space (normal quality).
•
4:2:2
– The video is compressed using 4:2:2 color space (high quality).
Encoding latency
Encoding latency selection in AVC and HEVC mode.
•
NORMAL
– Video will be encoded in normal latency. Latency may reach up to 1 sec due to
rate control decisions and GOP structure.
•
ULTRA LOW
– Video will be encoded in Ultra Low latency.
Encoding
latency will be
approximately 1/4 of the frame duration (e.g., at 60fps, frame duration is 16.67ms,
encoding latency can reach 4-5ms). In this mode, B frames are disables and ‘Low Latency
CBR’ is enabled.
Rate control
The algorithm used by the encoder to maintain the target encoder bit rate.
•
CBR
(Constant Bit Rate). In CBR, the encoder encodes the video at a constant bit rate.
•
Low Latency CBR.
Like CBR but rate control decisions are done in real time, it tries to
maintain an equal amount of frame sizes for all pictures.
Bitrate
Average video output bitrate. A higher bitrate yields a better-quality video.
Frame rate
The ratio of the target (output) frame rate to the input frame rate:
•
Full (All frames are encoded)
•
1/2 (Every second frame is encoded)
•
1/4 (Every 4th frame is encoded)
Note:
•
For interlaced video standards (such as 1080i50/60), only the “Full” frame rate is supported.
Intra refresh mode
•
If ‘Full frame’ is selected, when ever the I/IDR period is reached, a complete frame is
encoded as an I/IDR frame (This will create a relatively big frame is size).
•
If ‘GDR..’ is selected, frames are continuously refreshed with stripes (Horizontal or Vertical)
of Intra blocks. Selecting this mode will suppress high peaks of encoded frames.
Intra period/GDR
period
•
For ‘Full frame’, sets the interval (in number of frames) upon which the encoder will
produce an I/IDR (Intra/Instantaneous Decodable Refresh) Frame, e.g., setting this field to
30 will generate an I/IDR frame every 30 frames.
•
For ‘GDR..’, sets the period of Intra block refresh. For example, in case of ‘GDR-vertical’ the
values should be set to at least 135 (2160/16).
