Startup-time calculator

A dependency-free (pure standard-library) Python tool that turns startup-phase player data into the streaming-QoE numbers the way the standards define them. It does NOT decode video or compute a picture metric; a startup time comes from PLAYER EVENTS (play intent -> first rendered frame), not pixels. (1) STARTUP BUDGET: a component breakdown (network setup + manifest + first-segment fill to the buffer threshold + decode/render); reproduces the article's 90+160+500+150+100 = 1000 ms budget and th