I've come up with an absolute hack job of a way to fix the FMV issues. Follow these steps:

1. Flip and convert the .wmv files to .mp4
2. With a hex editor change all references to WMV in the dmc1-3 executables to MP4

I'm not sure how necessary or excessive step 2 is, however doing nothing would crash the game and just changing them to anything as stated in some other reports would just skip the FMVs. To be honest I'm not really sure why this works, I don't have much knowledge of video codecs. Here are some Bash scripts to automate the video conversions. Run one of these from the terminal whilst in each of the games "Video" directories. Requires ffmpeg to be installed:

.

#keep originals

for FMV in *; do ffmpeg -i $FMV -vf vflip ${FMV:0:-4}.mp4; done

.

#delete originals

for FMV in *; do ffmpeg -i $FMV -vf vflip ${FMV:0:-4}.mp4; rm $FMV; done

.

The FMVs will now all play with correct orientation. I converted them to mp4 because I couldn't figure out an easy way to automate flipping them as wmv. Doing this has however had the unexpected bonus of removing audio issues as well. I've played through the entirety of dmc1 with all FMVs playing properly and performance on par with Windows. I've also played the beginning of both dmc2 and dmc3 with no issues so far.