Video Trick Mode System

A method for generating an auxiliary video stream for reverse trick mode play, the method comprising:

• providing a primary video stream comprising at least one group of pictures, the group of pictures commencing with a first key frame and terminating with a frame immediately preceding a second key frame, the group of pictures further comprising at least one unidirectional predicted frame and a plurality of bidirectional predicted frames,
• predicting, on the basis of the second key frame, a substitute frame;
• and
• creating the auxiliary video stream by performing the following:
• substituting the at least one unidirectional predicted frame with the substitute frame;
• for each additional unidirectional predicted frame in the primary video stream, predicting, on the basis of a following unidirectional predicted frame, a corresponding substitute frame;
• and
• substituting each additional unidirectional predicted frame with the corresponding substitute frame,
• thereby creating an auxiliary video stream for reverse trick mode play.

An auxiliary video stream comprising at least one group of pictures (GOP), the auxiliary video stream corresponding to a primary video stream, the auxiliary video stream comprising:

• a key frame comprising the initial frame in a GOP in the primary video stream in forward presentation order;
• a plurality of uni-directional predicted frames, the frames comprised in the plurality of uni-directional predicted frames comprising substitute unidirectional predicted frames;
• and
• a plurality of bi-directional predicted frames,
• wherein the GOP in the auxiliary video stream comprises a GOP arranged in reverse processing order.

A system for generating an auxiliary video stream for reverse trick mode play, the system comprising:

• a primary video stream provider operative to provide a primary video stream, the primary video stream comprising at least one group of pictures, the group of pictures commencing with a first key frame and terminating with a frame immediately preceding a second key frame, the group of pictures further comprising at least one unidirectional predicted frame and a plurality of bidirectional predicted frames,
• a frame predictor operative to predict, on the basis of the second key frame, a substitute frame;
• and
• an auxiliary video stream creator operative to create the auxiliary video stream, the auxiliary video stream creator comprising:
• a frame substituter operative to substitute the at least one unidirectional predicted frame with the substitute frame, the frame predictor being further operative to predict, for each additional unidirectional predicted frame in the primary video stream, on the basis of a following unidirectional predicted frame, a corresponding substitute frame;
• and
• a frame substituter operative to substitute each additional unidirectional predicted frame with the corresponding substitute frame,
• thereby creating an auxiliary video stream for reverse trick mode play.

A system for generating an auxiliary video stream for reverse trick mode play, the system comprising:

• primary video stream providing means for providing a primary video stream, the primary video stream comprising at least one group of pictures, the group of pictures commencing with a first key frame and terminating with a frame immediately preceding a second key frame, the group of pictures further comprising at least one unidirectional predicted frame and a plurality of bidirectional predicted frames;
• frame predicting means for predicting, on the basis of the second key frame, a substitute frame;
• and
• auxiliary video stream creating means for creating the auxiliary video stream, the auxiliary video stream creating means comprising:
• frame substituting means for substituting the at least one unidirectional predicted frame with the substitute frame, the frame predicting means being further operative to predict, for each additional unidirectional predicted frame in the primary video stream, on the basis of a following unidirectional predicted frame, a corresponding substitute frame;
• and
• frame substituting means for substituting each additional unidirectional predicted frame with the corresponding substitute frame,
• thereby creating an auxiliary video stream for reverse trick mode play.