ensure fps limit of 120 enforced

[ryanjball]

Description

Ensure FPS limit of 120 is consistently enforced

Type of change

Please delete options that are not relevant.

• [X ] Bug fix (non-breaking change which fixes an issue)

How has this change been tested, please provide a testcase or example of how you tested the change?

Passed tests

[PacificDou]

Looks good! Just left a comment about the default fps value

[PacificDou]

Shall we make fps configurable and use a lower number (e.g., 5) as the default value?
higher value means more frames need to be processed. In many cases, maybe we don't need to run so many frames.

[ryanjball]

added fps as argument for manual test. default is 5 in predict_video()

[PacificDou]

LGTM!

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