Filbert,
you cannot compare 2.2.0 Alpha, which retains (or tries to retain
) WAV audio, with 2.1.4, which re-encode them to AC3.
If you want to have a fair contest you must setup 2.2.0 Alpha to force audio re-encoding to AC3. Just go to 'Preferences'/'AudioVideo' and toggle off 'Keep DVD Compliant Audio'. Then load your mov.
I did try to process your file with audio re-encoding to AC3: using DirectShowSource, AviSynth says "Render file, the filter graph manager won't talk to me" (do I miss a QuickTime directshow codec maybe?), while ffmpegsource does not complain but crashes anyway. Result is a AC3 file of few bytes that MuxMan accepts but the real result is a DVD with no audio. Same for 2.1.4 and 2.2.0 Alpha (they have same AVS script building and AC3 encoding routine). Is that your situation as well?
Bye