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ColorSignal::apply_to wrote the sample entry's colr box only for HDR, so SDR ProRes, DNxHR and APV MOVs carried no colour that Apple's media stack reads (it takes their colour only from colr, not from the codecs' frame headers): QuickTime Player and Final Cut saw no primaries, transfer or matrix. SDR exports now get colr with the export's colour too (nclc in MOV, nclx in MP4); HDR metadata stays PQ-only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>