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I have an ASS as the subtitle stream (with these fonts: - Orotund, jagb_.tff, jagw_.ttf, JUST.ttf, Gabrielle.ttf) in an MKV.

What technique should I use to hardsub this subtitle stream onto the MPEG4 (ISO/AVC) without losing quality?

Thanks for all suggestions

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I'm pretty sure it's impossible to hardcode subs without quality loss.

Unless there's a new technique developed in the last 4 years, the file needs to be converted to a lossless type then the subs need to be coded frame by frame and then compress again.

So: There is no technique that may be used to hardsub onto a compressed video without losing [more] quality.

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Well which technique has the least amount of quality loss? –  A T Feb 4 '12 at 6:43
    
I can point the way, but I can't explain the technique - I used to do this a looooooooooooooong time ago. Try checking this out. The concept is taking the video OUT from the MKV conteiner and then hardcode it. –  Johnny Bigoode Feb 7 '12 at 13:07
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