Welp, I've spent a while pulling my hair out on this one- I performed a system restore on my computer, installed the newest AMVapp, everything like I had before.. When I try to use avisynth to open an H264-encoded file, it gives me an error. I've tried several containers- MKV, MP4, etc, and different scripts (directshowsource, ffmpegsource, ffmpegsource2, ffvideosource..), and avisynth either crashes, tells me it can't open the specified file, or gives me this:
Any help to solve this is greatly appreciated.. Thanks in advance.