A computer-implemented method including displaying in a user interface, a first thumbnail representing a first video clip including a first plurality of frames; displaying in the first thumbnail, a first transition point positioned between a left edge and a right edge of the first thumbnail, the first transition point associated with a frame of the first plurality of frames, wherein, playback of the first plurality of frames starts with a first start frame positioned at the left edge and stops at the frame associated with the first transition point; receiving a first move input to move the frame associated with the first transition point to a new frame of the first plurality of frames; and in response to receiving the input, associating the new frame with the first transition point, wherein, in response to a playback input, playback starts with the first start frame and stops at the new frame.