User’s Manual of IVS-H125 Series
86
Chapter 10.
Bandwidth Estimation
The frame rate of video transmitted from the device depends on connection bandwidth between
client and server, video resolution, codec type, and quality setting of server. Here is a guideline to
help you roughly estimate the bandwidth requirements for your device.
The required bandwidth depends on content of video source. The slow motion video will produce
smaller bit rate generally and fast motion will produce higher bit rate vice versa. Actual results
generated by the device may be varying.
Image
Resolution
Average range of
data sizes for JPEG
mode
Average bit rate for
MPEG4 mode
Average bit rate for
H.264 mode
QCIF
6 ~ 12k byte per
frame
64kbps~256kbps
@ 30fps
32kbps~192kbps
@ 30fps
CIF
20 ~ 40k byte per
frame
384kbps~1024kbps
@ 30fps
256kbps~768kbps
@ 30fps
4CIF(D1)
50 ~ 150K byte per
frame
768kbps~4096kbps @
30fps
512kbps~3076kbps
@ 30fps
Note: Audio streaming also takes bandwidth around 32kbps. Some xDSL/Cable
modem upload speeds could not even reach up to 128 kbps. Thus, you may not be
able to receive good quality video while also streaming audio on a 128 kbps or lower
connection. Even though the upload speed is more than 128kbps, for optimal video
performance, disabling audio streaming will get better video performance.
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