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If this helps the flame train derail a bit:
Most Source engine game trailers, like Half-Life 2, are “pre-rendered”. If you record a sequence of gameplay as a “demo” (kb-level file that records player movement in a level) then you can record that demo into a video at a much slower rate than the gameplay, capturing every frame; as well as add camera motions to it. There are guides for individuals to do this using the “startmovie” command.
It’s just a logical way to ensure the video is seamlessly presented, especially since framerate optimization comes late in development.
Man I’m still trying to get one part for a gun that only spawns in a certain kind of weekly mission.
I log on, see that mission isn’t available, log off. Such engage, much gameplay.