{"schema":"record/v1","id":"art_01M5MSA3A2VG8KX8WT80FPVBQC","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How are hearing-impaired (HI) and visually-impaired narrative (VI-N) audio tracks represented in a DCP, and how do open tools model and check them?","summary":"In a DCP, hearing-impaired (HI) and visually-impaired narrative (VIN) audio are dedicated channels inside the main sound track, not separate files. SMPTE ST 428-12 defines HI (0Eh) as a dialog-intelligibility channel and VIN (0Fh) as narration describing picture events, and allows several of each for different languages. libdcp maps the MCA ids 'hi' and 'vin'/'vi-n' to its own channel slots, but its verifier has no HI/VIN-specific check. ClairMeta checks only an even channel count. 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ISDCF Doc 04 itself not read.\n\nLimitations: Standard and code read 2026-10-22; no DCP built or checked.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://pub.smpte.org/latest/st428-12/st0428-12-2013.pdf","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://cinepedia.com/accessibility/","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/cth103/libdcp/blob/891facc8ce17cd767948ac5c2eb629bca5288f64/src/verify.cc","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/cth103/libdcp/blob/891facc8ce17cd767948ac5c2eb629bca5288f64/src/types.h","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/cth103/libdcp/blob/891facc8ce17cd767948ac5c2eb629bca5288f64/src/main_sound_configuration.cc","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/Ymagis/ClairMeta/blob/b3b66a024174976ffbde4b6dfff2b599e84e4757/clairmeta/dcp_check_sound.py","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/Ymagis/ClairMeta/blob/b3b66a024174976ffbde4b6dfff2b599e84e4757/clairmeta/settings.py","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"}]},"categories":["T10","T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://pub.smpte.org/latest/st428-12/st0428-12-2013.pdf","claim":"In a DCP, hearing-impaired (HI) and visually-impaired narrative (VIN) audio are dedicated channels inside the main sound track, not separate files. 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ISDCF Doc 04 itself not read.\n\nLimitations: Standard and code read 2026-10-22; no DCP built or checked.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://pub.smpte.org/latest/st428-12/st0428-12-2013.pdf","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://cinepedia.com/accessibility/","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/cth103/libdcp/blob/891facc8ce17cd767948ac5c2eb629bca5288f64/src/verify.cc","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/cth103/libdcp/blob/891facc8ce17cd767948ac5c2eb629bca5288f64/src/types.h","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/cth103/libdcp/blob/891facc8ce17cd767948ac5c2eb629bca5288f64/src/main_sound_configuration.cc","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/Ymagis/ClairMeta/blob/b3b66a024174976ffbde4b6dfff2b599e84e4757/clairmeta/dcp_check_sound.py","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"},{"url":"https://github.com/Ymagis/ClairMeta/blob/b3b66a024174976ffbde4b6dfff2b599e84e4757/clairmeta/settings.py","note":"SMPTE ST 428-12:2013 channel table and note; libdcp src/types.h L100-110; libdcp src/main_sound_configuration.cc L175-177; libdcp src/verify.cc (whole-file search); ClairMeta dcp_check_sound.py L47-55"}]},"tags":[],"type":"article","links":[],"title":"How are hearing-impaired (HI) and visually-impaired narrative (VI-N) audio tracks represented in a DCP, and how do open tools model and check them?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"In a DCP, hearing-impaired (HI) and visually-impaired narrative (VIN) audio are dedicated channels inside the main sound track, not separate files. 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