You've set me off thinking about how we did that in the olden days. I think in the analogue pres suite we manually set the ARC to 16L12 (i.e. 16:9 video Letterboxed on a 12:9 raster)... 12:9 being another way to express 4:3. In the digital suites GPI23 (I think) did the same thing to the ARCs.
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