1. A method of repeat padding for hybrid video sequences in a video codec, comprising: determining a picture type of frames in a hybrid video sequence; for frames having a first picture type, expanding from an active content frame size of the respective picture to a padded frame size meeting a macroblock alignment restriction appropriate to the first picture type using a first form of repeat padding; and for frames having a second picture type, expanding from an active content frame size of the respective picture to a padded frame size meeting a macroblock alignment restriction appropriate to the second picture type using a second form of repeat padding.