RECOMMENDATION ITU-R BT.1379 … FRAMING OF WIDE-SCREEN 16:9 AND STANDARD 4:3 ASPECT RATIO PRODUCTIONS TO ACHIEVE A COMMON ...
ANNEX 1 … A framing technique to allow a common production format for 16:9 and 4:3 television programmes during a transition 
APPENDIX 1 TO ANNEX 1 … 14:9 framing with 16:9 camera source (figures drawn to scale)
APPENDIX 2 TO ANNEX 1 … 14:9 framing with 4:3 camera source (figures drawn to scale)