ng_bighalo
This is an avisynth script for subtitling encodes for http://tasvideos.org/
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Avisynth's subtitler has a fixed halo width. This is problematic with very large text, like the kind used with YouTube uploads.
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Avisynth's subtitler is antialiased by default. Antialiasing is very size dependant. A non-AA font is prefered for primary encodes, which will likely be upsized on playback.
ng_bighalo solves the first issue, and freesub is a bitmap subtitler that solves the second issue.
I've also included ng_sub which merges both functionality.