Vivotek PZ6122 User Manual download pdf (Page 46)

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Video Codec Parameters

“Text on video” The text will be displayed in the black bar above the video window

with a timestamp. The timestamp is captured from date and time of the Network

Camera that is maintained by a built-in real-time clock.

“Color” Select either for color or monochrome video display.

"Size" There are five options for three video sizes. “Half” is the quarter size of

“Normal” and “Normal” is the quarter size of “Double”. “Half x 2” has the same video

size as “Normal” but of a lesser quality, while consuming less network bandwidth.

“Normal x 2” has the same size as “Double” but of a lesser quality.

“Video codec type” It can be either MJPEG or MPEG4. In MJPEG mode, the video

frames are independent. In MPEG4 mode, there are I frames and P frames. To decode

a P frame need the information of previous frame. MPEG4 consumes much less network

bandwidth than MJPEG.

There are five dependent parameters provided for video performance adjustment.

"Maximum frame rate" This limits the maximal refresh frame rate, which can be

combined with the "Video quality control" to optimize the bandwidth utilization and

video quality. If the User wants to fix the bandwidth utilization regardless of the video

quality, choose "Fix bit rate" and select the desired bandwidth. MPEG4 video are

composed by I frames and P frames as the following sequence. IPPPPPIPPPPPIPPPP…

“Key frame interval” determines how many repeated P frames will appear after one

I frame. Large “Key frame interval” can reduce the bit rate, but cause image corrupt

longer if there is packet loss while transmission. “Fix bit rate” option and “Key frame

interval” option are only available in “MPEG4” mode. The video quality may be poor

due to the sending of maximal frame rate within the limited bandwidth when images

are moving rapidly. Consequently, to ensure detailed video quality (quantization rate)

regardless of the network, it will utilize more bandwidth to send the maximal frames

when images change drastically.

"Flip" Vertically rotate the video.

"Mirror" Horizontally rotate the video. Check options both if the Network Camera is

installed upside down.

“Improve efficiency in the multi-user environment” Check this option to improve

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Vivotek PZ6122 User Manual Page 46