There is no (MPEG-2, MPEG-4, ITU) standard for cinescope, but simple math tells me one should use a pixel aspect ratio of 239:125 (~1.912) for cine scope (DAR 2.39:1) content.
Cu Selur

Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.