User Manual

DS-2TD2137-7P Thermal Network Camera User Manual
UM DS-2TD2137-7P 042021NA 40
Frame Rate
Frame rate is the frequency at which the video stream is updated, 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 higher frame rate requires higher bandwidth and larger storage space.
Video Encoding
This is the compression standard the device adopts for video encoding.
NOTE: Available compression standards vary by model.
• H.264: Also known as MPEG-4 Part 10, Advanced Video Coding, this is a compression standard. Without
compressing image quality, it increases compression ratio and reduces the video file size more than
MJPEG or MPEG-4 Part 2.
• H.265: Also known as High Efficiency Video Coding (HEVC) and MPEG-H Part 2, this is a compression
standard. In comparison to H.264, it offers better video compression at the same resolution, frame rate,
and image quality.
• MJPEG (M-JPEG or MJPEG): Video compression format in which intraframe coding technology is used.
Images in a MJPEG format are compressed as individual JPEG images.
• Profile: This function means that under the same bitrate, the more complex the profile, the higher the
quality of the image, and the requirement for network bandwidth is also higher.
• I-Frame Interval: I-frame interval defines the number of frames between two I-frames.
In H.264 and H.265, an I-frame, or intraframe, 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, smaller I-frame interval, generates more steady and
reliable data bits while requiring more storage space.
• SVC (Scalable Video Coding): The Annex G extension of the H.264 or H.265 video compression standard.
The objective of SVC standardization is to enable encoding 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.T he 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 that can decode only a low-resolution subset, while more advanced hardware will be able to
decode high quality video streams.
Smoothing
This refers to the smoothness of the stream. The higher the smoothing value, the better the stream
fluency, though the video quality may not be so satisfactory. The lower the smoothing value, the higher
the stream quality, though it may appear not fluent.