DirectShow

https://docs.microsoft.com/en-us/windows/win32/directshow/filter-states

Filters have three possible states: stopped, paused, and running

Transitions between stopped and running always go through the paused state, so if the application calls Run on a stopped graph, the Filter Graph Manager pauses the graph before running it. 即每次点开始播放后，会先有 paused 状态，再转到 running 状态