"Unintentional perhaps?"
I'd be amazed if it was unintentional, the B747-400 has a restrictive flap lever gate which prevents you accidentally selecting flaps up in one smooth movement. It's at least a two or three stage process and not in the SOPs I use.
Where did you see the clip? Is there a link?
Maybe it could've been a training flight an they were taxying back for a further takeoff and hence retracting the flaps to the TO position.
Regards,
BH.