what's the minimum internet speed needed for webcam based video chat to work well?

I am developing a P2P video chat application.
1) What parameteres affect the quality of video chat?
- upload speed?
- download speed?
- ping?
- anything else?
2) What's minimum value of these parameteres for at least 640 X 480 size video?
3) Is the best home internet offerred in USA with the maximum speed good enough for video chat?

jencharlesAsked:
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BigBadWolf_000Connect With a Mentor Commented:
Wow  640 X 480 ... Well question would be quality of video desired i.e. kbps, what protocol

What parameteres affect the quality of video chat?
Both upload and download speed (upload is important since that were the cost goes up)...protcol used, HW or SW compression level used

What's minimum value of these parameteres for at least 640 X 480 size video?
Depends on what resolution, bitrate, protocol, and if HW/SW compression is used

Is the best home internet offerred in USA with the maximum speed good enough for video chat?
Yes, depending on quailty. broadband/dsl carriers offer anywhere from 1mbpsUp-3mbpsDown to 12mbpsUP - 20mbps Down
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