Summary

• Adds FPS-based throttling to prevent upstream pipelines from overwhelming downstream pipelines in chained setups (A → B → C)
• When an upstream pipeline produces frames faster than the downstream can consume, the throttler adds delays to match the consumption rate

How it works

The PipelineThrottler tracks input/output FPS for each pipeline processor:

• Measures how fast each pipeline consumes frames (input FPS) and produces frames (output FPS)
• When output FPS exceeds 1.5× the next pipeline's input FPS, introduces a delay to slow down production
• Throttling only applies to pipelines with video input that are chained to a next processor

Results

Tested with video-depth-anything + longlive + rife on 5090:

• base (main): 13.6-20.0 FPS
• with throttling (this PR): 17.0-20.4 FPS

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