Pictures:



Video:
http://www.sendspace.com/file/bqvze0
What I'm trying to do:
Turning a .mp4 file into .avi to swap the audio with a higher quality version and re-encode as mp4.
What didn't work:
- (Avisynth) ffmpegsource in Virtualdub => caused the error you see in the samples
- Same script to encode .mp4 file directly to .mp4 with swapped audio in zarxgui
=>


Any idea for a fix/alternative?