My vid has now dropped down to only 30 seconds complete again, and I've lost about 3 hours of work.
I'm going to see if I can get the encorder to save them as .m4v files and see if that's any better...
In the meantime though, if anyone knows of any free software that will change .mkv files into .avi files, PLEASE LET ME KNOW. Or alternatively, if anyone has a link for downloading .avi copies of the episodes in DVD/Bluray quality - that would avoid these problems altogether! - PLEASE LET ME KNOW.
ETA: IT LOOKS LIKE SO FAR THE .m4v VERSIONS ARE WORKING! So, let's cross our fingers that they continue to do so! I have now got the video back up to 44 seconds! Yay!
Also, Jared's dog died...which is far worse than my vidding problems.