Try to use VFAPI to make the fake avi files. It's included in the AMVApp 3.0 so I think you already have it.
It's easy to use and to me works great on every program (it works very well both on premiere and on after effects, even when I import premiere projects etc.).
The only problem you might encounter is that when you click on add job, you can't add files as there is no file extension compatible. If that happens you, than you have to use the readavs.dll and add a registry key.
Nothing hard. Just download the readavs.zip from
here, put the readavs.dll in the same directory of vfapi.exe (which should be "C:\Program Files\AMVApp\Support Tools") and edit the readavs.reg so that the line:
Code: Select all
"Avisynth"="D:\\TMPGEnc\\ReadAVS.dll"
becomes:
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"Avisynth"="C:\\Program Files\\AMVApp\\Support Tools\\ReadAVS.dll"
Which should be your file path. If your readavs.dll's file path is different, just use yours and be sure to use " \\ " and not just " \ " in the file path.
After editing the .reg file, double click it and see if vfapi works with .avs files now.