9. A method of selectively supplementing main program video content with a sign language interpretation, comprising: using a video receiver device, receiving data representing audio/video (A/V) content as part of a main program content having a first packet identifier (PID); using the video receiver device, receiving sign language video content data representing a sign language interpretation of the audio content and the sign language video content having a second PID; using the video receiver device, receiving a signal indicative of a user enabling or disabling display of the sign language video content; responsive to the signal indicative of the user selection to view the sign language content, configuring a picture-in-picture (PIP) circuit to selectively generate a display of a PIP window overlaying the main program content with the sign language video content; receiving a video frame of the A/V content, the video frame including plural macroblocks; determining whether a first macroblock in the plural macroblocks is at a boundary of the PIP window; responsive to the first macroblock not being at a boundary of the PIP window, not re-encoding the sign language content and outputting the first macroblock; responsive to the first macroblock being at a boundary of the window, determining whether the boundary is a first boundary or a second boundary; responsive to the boundary being the first boundary, re-encoding the first macroblock responsive to the first macroblock not being an I-macroblock, and not re-encoding the first macroblock responsive to the first macroblock being an I-macroblock; responsive to the boundary being the second boundary, not re-encoding the first macroblock responsive to the first macroblock being an I-macroblock, and responsive to the first macroblock not being an I-macroblock, re-encoding the first macroblock as an I-macroblock.
11. The method according to claim 9 , comprising ordering the received data so that the sign language video content is received in advance of the main program content video content.