FFMPEG fade in/out expressions

I’ve been playing with FFMPEG lately mulling over a plugin for Appcelerator Titanium and figured we’ll need a text rendering with nice fading in/out effect. There’s text drawing filter in FFMPEG, but not a function to easily fade it, so I came up with a couple of expressions of my own. I’m working with alpha channel here, but it can easily be applied to other properties.

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