Premiere Pro CS5.5 and Avisynth using AVCSource

[thuviaptarth]

When I import avisynth scripts (using AVCSource for dga indices of h264 files) into Premiere Pro CS5.5, I get the error "AVS File Error! LoadPlugin: unable to load $path/DGAVCDecode.dll". It's the same error whether I spell out the plugin path or leave it assumed (it's in the default plugin directory). The same scripts run without a problem in VirtualDubMod. Other scripts using DGDEcode.dll import into Premiere without a problem.

Any ideas on how to fix this, or an alternate filter for h264 source?

Help much appreciated!

--t.

Script
LoadPlugin("C:\Program Files (x86)\AviSynth 2.5\plugins64\DGAVCDecode.dll")
AVCSource("F:\tv\spn\s7\mkv\Supernatural S07E01.dga")
LanczosResize(640,360)

Setup
Windows 7 64-bit
Premiere Pro CS5.5
Avisynth 2.5.8 64-bit 4/16/10
Pwolf's Premiere CS AVS Importer x64 1.1 plugin