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Technical Committee on Human Factors - Guidelines for real-time communication services
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Frame-rate/resolution ratio
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Conclusion
In principle there are two rules to use to decide the Framerate-Resolution ratio if the bit-rate, quantisation level and processor performance are fixed:
If the video is to show many details, use a high resolution
If the video is to show movement, have a high Framerate.
However, the decision may not be so simple because most video communication can be expected to involve important movements and details.