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DS-2TD2xxx-xxxx/xx Thermal and Optical Bi-Spectrum Network Camera User Manual
UM DS-2TD2xx-xxxx/xx Thermal 072020NA 42
9.1.5 Video Quality
When the Bitrate Type is set as Variable, video quality is configurable. Select a video quality according to
actual needs. Note that higher video quality requires higher bandwidth.
9.1.6 Frame Rate
The frame rate describes the frequency at which the video stream is updated and is measured in frames
per second (fps).
A higher frame rate is advantageous when there is movement in the video stream as it maintains image
quality throughout. Note that a higher frame rate requires higher bandwidth and more storage space.
9.1.7 Video Encoding
The compression standard the device uses for video encoding.
Available compression standards vary by device model.
• H.264: Also known as MPEG-4 Part 10, Advanced Video Coding, is a compression standard. Without
compressing image quality, it increases compression ratio and reduces the size of a video file more
than MJPEG or MPEG-4 Part 2.
• H.265: Also known as High Efficiency Video Coding (HEVC) and MPEG-H Part 2 compression standard. In
comparison to H.264, it offers better video compression at the same resolution, frame rate, and image
quality.
• MJPEG: Motion JPEG (M-JPEG or MJPEG) is a video compression format in which intraframe coding
technology is used. Images in MJPEG format is compressed as individual JPEG images.
• Profile: This function means that under the same bitrate, the more complex the profile is, the higher
the quality of the image, and the requirement for network bandwidth is also higher.
• I-Frame Interval: Defines the number of frames between two I-frames.
In H.264 and H.265, an I-frame, or intra frame, is a self-contained frame that can be independently
decoded without any reference to other images. An I-frame consumes more bits than other frames.
Thus, video with more I-frames, in other words, a smaller I-frame interval, generates more steady and
reliable data bits while requiring more storage space.
• SVC: Scalable Video Coding (SVC) is the name for the Annex G extension of the H.264 or H.265 video
compression standard.
The objective of the SVC standardization has been to enable the encoding of a high-quality video
bitstream that contains one or more subset bitstreams that can themselves be decoded with a
complexity and reconstruction quality similar to that achieved using the existing H.264 or H.265 design
with the same quantity of data as in the subset bitstream. The subset bitstream is derived by dropping
packets from the larger bitstream.
SVC enables forward compatibility for older hardware: the same bitstream can be consumed by basic
hardware, which can only decode a low-resolution subset, while more advanced hardware will be able
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