Vivotek PT3122 Datasheet Page 37

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Audio/Video Codec Parameters
Audio Parameters
“Mute” Check the option will make the Network Camera reboot to force all the
connection using HTTP mode to view the video, therefore no audio can be heard at
any client side.
“Improve audio quality in low bandwidth environment” Check the option will
make the Network Camera reboot to make communication of audio channel more
efficient.
“Audio Source” The selection can be “Internal microphone” or “External
microphone”. When “External microphone” is selected, the red light of the
Network Camera will blink once a second.
Video 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 the 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”. “Half x 2” has the same video size as “Normal” but of a lesser quality,
while consuming less network bandwidth. “Normal x 2” will do digital zoom with
factor of 200% for both width and height of the video, and “Double” will have the
Network Camera sending 704x480(NTSC)/704x576(PAL) size video to every
connections with the maximum frame-rate of 10.
"Maximum frame rate" This limits the maximal refresh frame rate, which can be
combined with the "Video quality control" to optimize 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. 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
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