Looks okay except for the test failures. It's a bit weird that W7 advertise but doesn't accept `MEDIASUBTYPE_IYUV` / `MEDIASUBTYPE_I420`, but I guess you could either skip them, or mark them as broken (or skip the `test_wmv_decoder_dmo_get_size_info` test entirely like `test_wmv_decoder_media_object` was doing, as you prefer).