Trick mode using dummy bidirectional predictive pictures

摘要

The invention concerns a method ( 200 ) or ( 300 ) and system ( 100 ) for performing a trick mode on a video signal containing a plurality of progressively scanned original pictures. The method ( 200 ) includes the steps of: selectively repeating ( 214 ) at least one of the original pictures to convert the video signal to a trick mode video signal in response to a trick mode command; and the step of selectively inserting ( 216 ) at least one dummy bidirectional predictive picture in the trick mode video signal. In addition, the method ( 300 ) can include the step of monitoring ( 316 ) the trick mode video signal so that the dummy bidirectional predictive picture is selectively inserted when the bit rate exceeds a predetermined threshold. Certain pictures in the trick mode video signal can also be modified ( 220 ) ( 328 ) to reflect an intended display order.