I recently went through all my old Mechwarrior discs to rip and archive the major intro/cutscene/ending videos. The converter I was using happened to include WebM support, so I went ahead and made these for your viewing pleasure. These are all at their original resolutions.
Hopefully I'm not violating the website's code of conduct; I figure these are fair game since they're all over the Youtubes as well.
Mechwarrior 2
Intro
Wolf Landing
Jade Falcon Landing
Wolf Ending
Jade Falcon Ending
Mechwarrior 2: Ghost Bear's Legacy
Intro
Raid
Ending
Mechwarrior 2: Mercenaries
Intro
Ending
Mechwarrior 3 (big files)
Intro
Campaign
Ending
Mechcommander (big files)
Intro
Ending
Mechwarrior 4 (big file)
Intro
I also had these two videos from long ago, but no clue where they're from:
Catapult
Ambush