Vivotek IP7138 - Manual (Page 40)

There are three dependent parameters provided in MPEG-4 mode for video
performance adjustment.
“Intra frame period” The interval of intra frame.
“Max frame rate” This limits the maximal refresh frame rate, which can be combined
with the “Video quality” to optimize bandwidth utilization and video quality. Choose
“Constant bit rate” If the user wants to fix the bandwidth utilization regardless of the
video quality, choose “Fixed quality” 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
quality (quantization rate) regardless of the network, it will utilize more bandwidth to
send the maximal frames when images change drastically.
In JPEG mode, user can set “Max frame rate” and “Video quality” to adjust the
video performance.
Audio settings
“Use” Switch “Internal” or “Microphone” to set up the source of audio input
“Mute” To turn off audio
“Internal microphone input gain” Modify the gain of the internal audio input
“External microphone input” There are two gain options, 0dB and 20dB.
“Audio type” Select audio codec “AAC” or “GSM-AMR” and the bit rate
39 - User's Manual
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