Great to know, but that's not exactly going to be a working solution for what I was attempted to do - replace the existing MP4 video files with better-quality versions for use in the upcoming v0.9.2 (v0.9.3?).
EDIT: fun fact, in the PS2 OPs for Fate and HF, there's a single black frame between the close-up of Rider's face and Ryuudou temple; this black frame does not exist in the PS2 UBW OP though implying that it's a mistake, especially since the frame that the PS2 UBW OP uses instead is another unique frame of Rider (and yes, this exists in not only the stock non-HD MPG OP videos bundled with RN PC but also in the Type Moon Fes. blu-ray and therefore the existing HD OPs used in "ultimate edition").
So one of several improvements in my better-quality OP versions is taking that face close-up Rider scene without the black frame from the PS2 UBW OP and using it in place of the same scenes in the PS2 Fate and HF OPs.
(and now that I've brought your attention to said black frame, you'll never be able to un-see the flicker of said black frame ever again. Good thing I've fixed it then! )
EDIT 2: Hey Jack, if by some chance you read this (seems unlikely since he hasn't logged in for over a month...), I just want to let you know that I'm not touching the UBW and HF vita OPs (outside of their audio) since they pretty much need a color expert or something in order to turn the Vita-ripped OPs into looking like the Blu-ray and mobile-ripped OPs (whenever I got one scene looking really close, then another scene would still look incorrect...and then correcting said scene would result in the first scene looking wrong! oy vey).
I may revisit them in the future, but as of right now my current method results in way too much variability between scenes, and I'm not OCD enough to go through every single scene individually and color-correct each one separately - that'd take way too much time and effort for me to care enough to do it.