Media Foundation: How to Decode Compressed AVI?

Question

folks!

I'm trying to transcode a compressed .avi file to .wmv using Media Foundation. While I've succeeded in using MSDN's sample for transcoding to handle an uncompressed .avi, I've had no luck with several different types of compressed .avi (Windows Video 1 is one example of compression).

Does anyone have experience with this? I have had little luck searching, other than MSDN (which does not clearly handle this particular case).

One route I'm leaning toward is writing a custom Media Foundation Transform to decode using Video For Windows internally, but it seems like I -must- be reinventing the wheel. A sample of something similar can be found here.

Please tell me I'm foolish and show me what I'm missing! Thanks. :)