The best replacement for avisynth is 2 pass.

The best alternatives to avisynth are rated as following:
★★★★★  2 pass
★★★★★  virtualdub
★★★★  mencoder

Your alternative for avisynth is not listed? Suggest!
Speaking about avisynth, one probably shouldn't forget about virtualdub.

Other search terms related to avisynth and their ratings are:
★★★★★ virtualdub
★ ffdshow
★ megui
virtualdubmod
tmpgenc
cce
mvtools
You have in mind a companion for avisynth and it is not yet here? Propose!



Google Trends

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avisynth
2 pass
virtualdub