{"abstract":"Labels using the period or comma drop-frame spelling are rejected.","category":"Broadcast timecode arithmetic","checks":9,"contract":"Parse HH:MM:SS;FF drop-frame 29.97 labels (the last separator may be \";\", \",\" or \".\"). Labels ;00 and ;01 at second 00 of minutes not divisible by 10 do not exist and return None, as do out-of-range fields (hours 0-23, frames 0-29). Frame count = nominal 30 fps count minus 2 per elapsed minute except every tenth minute.","contract_signature":"tc","evaluation_group":"w2-broadcast-timecode-arithmetic-df29-label-to-frames","failed_approach":"Accepting a colon instead admits non-drop labels while still refusing the period and comma forms.","family":"w2-broadcast-timecode-arithmetic-df29-label-to-frames-drop-separator-set","id":"FA-78391","implementations":{"attempt":{"sha256":"960c390e8a5ae4202ae21f93ae5b6048ec4e8360d666133c031620c1b5ce7444","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re\nN = 1\nobservations = []\ndef solve(tc):\n    m=re.fullmatch(r'(\\d{2}):(\\d{2}):(\\d{2})[;:](\\d{2})',tc)\n    if not m:\n        return None\n    h,mi,s,f=map(int,m.groups())\n    if h>23 or mi>59 or s>59:\n        return None\n    if f>29:\n        return None\n    if s==0 and f<2 and mi%10!=0:\n        return None\n    tm=h*60+mi\n    return (tm*60+s)*30+f-2*(tm-tm//10)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: drop separator set', ['23:00:00.02'], 2481518), ('regression variant: drop separator set', ['23:20:00,00'], 2517480), ('partial repair probe: drop separator set', ['09:59:01.03'], 1077153), ('partial repair variant: drop separator set', ['01:01:00,02'], 109692), ('boundary control', ['00:01:00;02'], 1800), ('boundary control', ['01:00:00;00'], 107892), ('normal control', ['00:01:00;00'], None), ('normal control', ['00:00:59;29'], 1799), ('normal control', ['23:59:59;29'], 2589407)], [('regression: drop separator set', ['09:59:01.03'], 1077153), ('regression variant: drop separator set', ['01:01:00,02'], 109692), ('partial repair probe: drop separator set', ['23:10:01.01'], 2499529), ('partial repair variant: drop separator set', ['09:00:01,29'], 971087), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['24:00:00:31'], None), ('normal control', ['09:11:60.03'], None), ('normal control', ['24:20:59,31'], None)], [('regression: drop separator set', ['23:10:01.01'], 2499529), ('regression variant: drop separator set', ['09:00:01,29'], 971087), ('partial repair probe: drop separator set', ['00:11:00.03'], 19783), ('partial repair variant: drop separator set', ['23:09:00,15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['23:59:59;29'], 2589407), ('normal control', ['00:01:01;03'], 1831), ('normal control', ['01:60:00,02'], None), ('normal control', ['23:59:60,00'], None)], [('regression: drop separator set', ['00:11:00.03'], 19783), ('regression variant: drop separator set', ['23:09:00,15'], 2497713), ('partial repair probe: drop separator set', ['09:00:01.02'], 971060), ('partial repair variant: drop separator set', ['00:01:00.15'], 1813), ('boundary control', ['01:00:00;00'], 107892), ('boundary control', ['00:01:00;02'], 1800), ('normal control', ['23:11:59;00'], 2503066), ('normal control', ['01:20:60;00'], None), ('normal control', ['09:60:00:31'], None)], [('regression: drop separator set', ['09:00:01.02'], 971060), ('regression variant: drop separator set', ['00:01:00.15'], 1813), ('partial repair probe: drop separator set', ['23:00:01:29'], None), ('partial repair variant: drop separator set', ['09:10:00,02'], 989012), ('boundary control', ['00:00:59;29'], 1799), ('boundary control', ['00:01:00;00'], None), ('normal control', ['01:11:01;30'], None), ('normal control', ['24:60:01:02'], None), ('normal control', ['01:59:60;30'], None)]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"7349c0fa202b48353cb6b29460f93967af56235f81e4d26e4c7ec7428bc1b839","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re\nN = 1\nobservations = []\ndef solve(tc):\n    m=re.fullmatch(r'(\\d{2}):(\\d{2}):(\\d{2});(\\d{2})',tc)\n    if not m:\n        return None\n    h,mi,s,f=map(int,m.groups())\n    if h>23 or mi>59 or s>59:\n        return None\n    if f>29:\n        return None\n    if s==0 and f<2 and mi%10!=0:\n        return None\n    tm=h*60+mi\n    return (tm*60+s)*30+f-2*(tm-tm//10)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: drop separator set', ['23:00:00.02'], 2481518), ('regression variant: drop separator set', ['23:20:00,00'], 2517480), ('partial repair probe: drop separator set', ['09:59:01.03'], 1077153), ('partial repair variant: drop separator set', ['01:01:00,02'], 109692), ('boundary control', ['00:01:00;02'], 1800), ('boundary control', ['01:00:00;00'], 107892), ('normal control', ['00:01:00;00'], None), ('normal control', ['00:00:59;29'], 1799), ('normal control', ['23:59:59;29'], 2589407)], [('regression: drop separator set', ['09:59:01.03'], 1077153), ('regression variant: drop separator set', ['01:01:00,02'], 109692), ('partial repair probe: drop separator set', ['23:10:01.01'], 2499529), ('partial repair variant: drop separator set', ['09:00:01,29'], 971087), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['24:00:00:31'], None), ('normal control', ['09:11:60.03'], None), ('normal control', ['24:20:59,31'], None)], [('regression: drop separator set', ['23:10:01.01'], 2499529), ('regression variant: drop separator set', ['09:00:01,29'], 971087), ('partial repair probe: drop separator set', ['00:11:00.03'], 19783), ('partial repair variant: drop separator set', ['23:09:00,15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['23:59:59;29'], 2589407), ('normal control', ['00:01:01;03'], 1831), ('normal control', ['01:60:00,02'], None), ('normal control', ['23:59:60,00'], None)], [('regression: drop separator set', ['00:11:00.03'], 19783), ('regression variant: drop separator set', ['23:09:00,15'], 2497713), ('partial repair probe: drop separator set', ['09:00:01.02'], 971060), ('partial repair variant: drop separator set', ['00:01:00.15'], 1813), ('boundary control', ['01:00:00;00'], 107892), ('boundary control', ['00:01:00;02'], 1800), ('normal control', ['23:11:59;00'], 2503066), ('normal control', ['01:20:60;00'], None), ('normal control', ['09:60:00:31'], None)], [('regression: drop separator set', ['09:00:01.02'], 971060), ('regression variant: drop separator set', ['00:01:00.15'], 1813), ('partial repair probe: drop separator set', ['23:00:01:29'], None), ('partial repair variant: drop separator set', ['09:10:00,02'], 989012), ('boundary control', ['00:00:59;29'], 1799), ('boundary control', ['00:01:00;00'], None), ('normal control', ['01:11:01;30'], None), ('normal control', ['24:60:01:02'], None), ('normal control', ['01:59:60;30'], None)]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic bounded teaching model with a stipulated toy contract; it does not claim conformance to SMPTE or any broadcast standard. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-broadcast-timecode-arithmetic-df29-label-to-frames-drop-separator-set","generated_at":"2026-09-29T14:49:34.726784+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Timecode arithmetic errors misplace edits, commercial breaks and captions against the broadcast clock.","root_cause":"Only the semicolon is accepted as the drop-frame separator.","sha256":"33ac84ec72a5d7f5eba9d6a8605992696c7b5fb44d16ab3d9733a92c0cf37c3e","title":"Drop-frame 29.97 label to frame count: drop separator set · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.307,"exit_code":1,"observations":[{"actual":null,"check":"regression: drop separator set","expected":2481518,"passed":false},{"actual":null,"check":"regression variant: drop separator set","expected":2517480,"passed":false},{"actual":null,"check":"partial repair probe: drop separator set","expected":1077153,"passed":false},{"actual":null,"check":"partial repair variant: drop separator set","expected":109692,"passed":false},{"actual":1800,"check":"boundary control","expected":1800,"passed":true},{"actual":107892,"check":"boundary control","expected":107892,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true},{"actual":1799,"check":"normal control","expected":1799,"passed":true},{"actual":2589407,"check":"normal control","expected":2589407,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: drop separator set\", \"actual\": null, \"expected\": 2481518, \"passed\": false}, {\"check\": \"regression variant: drop separator set\", \"actual\": null, \"expected\": 2517480, \"passed\": false}, {\"check\": \"partial repair probe: drop separator set\", \"actual\": null, \"expected\": 1077153, \"passed\": false}, {\"check\": \"partial repair variant: drop separator set\", \"actual\": null, \"expected\": 109692, \"passed\": false}, {\"check\": \"boundary control\", \"actual\": 1800, \"expected\": 1800, \"passed\": true}, {\"check\": \"boundary control\", \"actual\": 107892, \"expected\": 107892, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1799, \"expected\": 1799, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 2589407, \"expected\": 2589407, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.925,"exit_code":1,"observations":[{"actual":null,"check":"regression: drop separator set","expected":2481518,"passed":false},{"actual":null,"check":"regression variant: drop separator set","expected":2517480,"passed":false},{"actual":null,"check":"partial repair probe: drop separator set","expected":1077153,"passed":false},{"actual":null,"check":"partial repair variant: drop separator set","expected":109692,"passed":false},{"actual":1800,"check":"boundary control","expected":1800,"passed":true},{"actual":107892,"check":"boundary control","expected":107892,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true},{"actual":1799,"check":"normal control","expected":1799,"passed":true},{"actual":2589407,"check":"normal control","expected":2589407,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: drop separator set\", \"actual\": null, \"expected\": 2481518, \"passed\": false}, {\"check\": \"regression variant: drop separator set\", \"actual\": null, \"expected\": 2517480, \"passed\": false}, {\"check\": \"partial repair probe: drop separator set\", \"actual\": null, \"expected\": 1077153, \"passed\": false}, {\"check\": \"partial repair variant: drop separator set\", \"actual\": null, \"expected\": 109692, \"passed\": false}, {\"check\": \"boundary control\", \"actual\": 1800, \"expected\": 1800, \"passed\": true}, {\"check\": \"boundary control\", \"actual\": 107892, \"expected\": 107892, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1799, \"expected\": 1799, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 2589407, \"expected\": 2589407, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}