Cannot record more than a few seconds of a screencast
Here is a screencast where I press Ctrl+Shift+Alt+R, select a portion of my screen, and record myself right clicking, choosing cut, right clicking, and choosing paste. Firefox and the standard Videos application shows only when the first right-click menu shows up, then the rest of the video is that image frozen. VLC shows it up until the instant before the right-click menu shows up, then the rest of the video is that image frozen. The video contents should be consistent across players.
Neither of them shows what happened on my screen during the entire screencast. That's probably the bigger issue.