spumux quality

[rajalev]

Hi:

I've been using avisynth's textsub to encode subtitles (SRT format) directly into the video stream.
I now have a need to encode 3 sub streams. So, I need selectable subs.
Unfortunatelly using dvduathor's spumux, results in poor rendered quality subs when compared to textsub.

I'm using an arial font in windows XP.

Is there a way to improve spumux rendering quality,
or
a tool that can previously render the subs to a bitmap format compatible with spumux,
or even,
an alternate tool to mux a sub stream with good rendering quality?


thank you all
rajalev