Here is what I found.
My setup :
Engine v4.6
I have a level blueprint with several ‘Execute Console Command’ nodes to set several options when I play the game. The last of which will trigger the ‘STARTMOVIECAPTURE’ just after a matinee actor is played.
My Results :
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When I launch the game with the ‘Launch’ button to open it into a new window no video file gets saved. And the game doesn’t crash.
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When I launch the game in the editor with the play button it records a 1.14gig video. But when I open it to watch it. It has a 0:00 length. Additionally when I hit ESC to get back into editor mode the engine crashes.
I hope this helps shed some light onto the issue.