BlueNet Video BB01 User Manual download pdf (Page 54)

Appendix C

Bandwidth Calculation

Appendix C: Bandwidth Calculation

The frame rate of video transmitted from the IVS-100 depends on connection

bandwidth between client and server and quality setting of server. Here is a guideline

to help you roughly estimate the bandwidth requirements form your IVS-100.

Image bandwidth is approximately equal to the average frame rate in frames per sec-

ond multiplied by the average frame data size in kilobits. Frame data size, or the num-

ber of bits comprising a single video frame varies a great deal from depending on

scene complexity, lighting conditions, camera noise, etc. The table shown below is

reference figures. Actual results generated by the IVS-100 may be varying.

Image Resolution Average range of Data Sizes

176 x 144 (QCIF) 20 – 40k bit

320 x 240 (QVGA) 56– 92k bit

352 x 288 (CIF) 64 – 112k bit

640 x 480 (VGA) 160 – 320k bit

For example, streaming 2 fps of 320 x 240 video requires 112 to 184 kbps (kilobits per

second). Therefore, with a 128K upload connection; you will typically see 3 to 6

frames per second with 176 x 144 resolution and 1 to 2 frames per second with 320 x

240 resolution without audio stream.

Audio streaming also takes bandwidth around 32 kbps to

64kbps. Most ADSL/Cable modem upload speeds may not

even reach up to 128 kbps. Thus, you may not be able to

receive any video while streaming audio on a 128 kbps

or lower connection. Even though the upload speed is

more than 128kbps, for optimal video performance, dis-

abling audio streaming will get better video perform-

ance.

ÍNote

1 2 ... 49 50 51 52 53 54 55

No comments

BlueNet Video BB01 User Manual Page 54