If it can be done, then can crop in Avisynth, and addborders using eg ffmpeg during encode, no idea how to do that. [perhaps x264 can also add borders, dont know]
Avisynth only processes uncompressed video/audio, nothing whatever to do with encoded clip.
Simplest would be to just trim into 3 parts, intro, main, exit, and use crop/addborders on main,
however LetterBox is better option than crop/addborders, does it in single step, and faster.
And of course splice before encode eg Intro ++ Main ++ Exit.
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