I have noticed since a few month that my uploaded video (on vimeo or youtube) I shot with my Canon T2i/550D are a bit jerky (I don't know if it's the reel word...).
I wonder if it's a probleme of shutter speed set to hight (up to 1/1000') or something else.
The fact is when I watch the video on my computer (Off line), everything is perfect.
You can see an example of what i'm triing to describe here :
I precise that i use the exporting setting that is recognised by vimeo.