It won't load the files. I also use avidemux and that stops before I get a full copy. I transcode it to avi but when editing it the sound isn't in sync. If there is easy way to remove commercials I would do that.
This may seem like a novice approach (which I am) but may be an option.
I use Sony’s Movie Studio to create videos, but have noticed it doesn’t like .avi files.
I also use Widows Movie Maker to shrink massive video files down to something more manageable, similar to what you want to do. However, WMM doesn’t like .mp4 files but loves .avi files.
During my obsessive-compulsive, self-inflicted learning, I stumbled across Format Factory
. A free utility that converts ANY video/photo/audio file to just about any other.
If your video editor requires a certain ‘format’, Format Factory can covert it to that standard. Once you have edited out the commercials, you can use it to convert your finished video to .avi, filter it through WMM, and shrink it down to <100Mb… a size uploadable to YouTube.
Just last night I had an 8.77Gb .avi file that I filtered through WMM and shrank it down to 40Mb with minimal loss of video quality. Audio and video remained in sync.
I hope this helps. If not, then I guess I just flashed my n00bs!