You're trying to open a MKV with header compression, and the FFMS2 included with Aegisub 2.1.8 does not support that. You need a newer FFMS2, but since the API and ABI have changed you can't just update the DLL; you need to update Aegisub as well. Go grab one of the 2.1.9 builds.
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17:43:13 <~deculture> Also, TheFluff, you are so fucking slowpoke.jpg that people think we dropped the DVD's.
17:43:16 <~deculture> nice job, fag!
01:04:41 < Plorkyeran> it was annoying to typeset so it should be annoying to read
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