{"abstract":"Frame counts after the first hour are too high by 108 frames per hour.","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.","evaluation_group":"w2-broadcast-timecode-arithmetic-df29-label-to-frames","failed_approach":"Rounding the tenth-minute exemptions up under-counts dropped frames in the first minutes of each ten.","family":"w2-broadcast-timecode-arithmetic-df29-label-to-frames-dropped-frame-total","id":"FA-78406","implementations":{"attempt":{"sha256":"95f01375b566f4d877c6d41a65a1177886bf7cc40cdfd591e1529ce424174022","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+9)//10)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: dropped frame total', ['01:00:00;00'], 107892), ('regression variant: dropped frame total', ['01:09:59;03'], 125847), ('partial repair probe: dropped frame total', ['00:01:59;01'], 3569), ('partial repair variant: dropped frame total', ['01:59:01;29'], 214043), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:10:00;00'], 17982), ('normal control', ['00:00:59;29'], 1799), ('normal control', ['24:01:01.01'], None), ('normal control', ['00:60:01:01'], None)], [('regression: dropped frame total', ['23:59:59;29'], 2589407), ('regression variant: dropped frame total', ['23:11:59;00'], 2503066), ('partial repair probe: dropped frame total', ['09:59:01.03'], 1077153), ('partial repair variant: dropped frame total', ['23:09:00;15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['09:11:60.03'], None), ('normal control', ['00:59:00;31'], None), ('normal control', ['01:60:00,02'], None)], [('regression: dropped frame total', ['23:00:00.02'], 2481518), ('regression variant: dropped frame total', ['09:01:00;03'], 972829), ('partial repair probe: dropped frame total', ['00:11:00.03'], 19783), ('partial repair variant: dropped frame total', ['01:01:00,02'], 109692), ('boundary control', ['00:00:59;29'], 1799), ('boundary control', ['00:01:00;00'], None), ('normal control', ['23:59:60,00'], None), ('normal control', ['01:59:00;01'], None), ('normal control', ['09:60:00:31'], None)], [('regression: dropped frame total', ['09:59:01.03'], 1077153), ('regression variant: dropped frame total', ['09:00:01.02'], 971060), ('partial repair probe: dropped frame total', ['01:09:59;03'], 125847), ('partial repair variant: dropped frame total', ['01:11:01;29'], 127731), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:10:00;00'], 17982), ('normal control', ['01:11:01;30'], None), ('normal control', ['24:00:01.30'], None), ('normal control', ['23:00:01:29'], None)], [('regression: dropped frame total', ['23:10:01.01'], 2499529), ('regression variant: dropped frame total', ['01:59:01;29'], 214043), ('partial repair probe: dropped frame total', ['00:01:01;03'], 1831), ('partial repair variant: dropped frame total', ['23:09:00,15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['23:09:00.00'], None), ('normal control', ['24:10:00,02'], None), ('normal control', ['00:60:59.29'], 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":"0ed4eab96763a536b7ed767074134b63db8a0b8360f68ec3962b24611580d0b7","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*(mi-mi//10)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: dropped frame total', ['01:00:00;00'], 107892), ('regression variant: dropped frame total', ['01:09:59;03'], 125847), ('partial repair probe: dropped frame total', ['00:01:59;01'], 3569), ('partial repair variant: dropped frame total', ['01:59:01;29'], 214043), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:10:00;00'], 17982), ('normal control', ['00:00:59;29'], 1799), ('normal control', ['24:01:01.01'], None), ('normal control', ['00:60:01:01'], None)], [('regression: dropped frame total', ['23:59:59;29'], 2589407), ('regression variant: dropped frame total', ['23:11:59;00'], 2503066), ('partial repair probe: dropped frame total', ['09:59:01.03'], 1077153), ('partial repair variant: dropped frame total', ['23:09:00;15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['09:11:60.03'], None), ('normal control', ['00:59:00;31'], None), ('normal control', ['01:60:00,02'], None)], [('regression: dropped frame total', ['23:00:00.02'], 2481518), ('regression variant: dropped frame total', ['09:01:00;03'], 972829), ('partial repair probe: dropped frame total', ['00:11:00.03'], 19783), ('partial repair variant: dropped frame total', ['01:01:00,02'], 109692), ('boundary control', ['00:00:59;29'], 1799), ('boundary control', ['00:01:00;00'], None), ('normal control', ['23:59:60,00'], None), ('normal control', ['01:59:00;01'], None), ('normal control', ['09:60:00:31'], None)], [('regression: dropped frame total', ['09:59:01.03'], 1077153), ('regression variant: dropped frame total', ['09:00:01.02'], 971060), ('partial repair probe: dropped frame total', ['01:09:59;03'], 125847), ('partial repair variant: dropped frame total', ['01:11:01;29'], 127731), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:10:00;00'], 17982), ('normal control', ['01:11:01;30'], None), ('normal control', ['24:00:01.30'], None), ('normal control', ['23:00:01:29'], None)], [('regression: dropped frame total', ['23:10:01.01'], 2499529), ('regression variant: dropped frame total', ['01:59:01;29'], 214043), ('partial repair probe: dropped frame total', ['00:01:01;03'], 1831), ('partial repair variant: dropped frame total', ['23:09:00,15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['23:09:00.00'], None), ('normal control', ['24:10:00,02'], None), ('normal control', ['00:60:59.29'], 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"},"fixed":{"sha256":"0a215dee5923d5b85699762209718484be9da8554bf97c14038ddc1162d56d9b","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: dropped frame total', ['01:00:00;00'], 107892), ('regression variant: dropped frame total', ['01:09:59;03'], 125847), ('partial repair probe: dropped frame total', ['00:01:59;01'], 3569), ('partial repair variant: dropped frame total', ['01:59:01;29'], 214043), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:10:00;00'], 17982), ('normal control', ['00:00:59;29'], 1799), ('normal control', ['24:01:01.01'], None), ('normal control', ['00:60:01:01'], None)], [('regression: dropped frame total', ['23:59:59;29'], 2589407), ('regression variant: dropped frame total', ['23:11:59;00'], 2503066), ('partial repair probe: dropped frame total', ['09:59:01.03'], 1077153), ('partial repair variant: dropped frame total', ['23:09:00;15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['09:11:60.03'], None), ('normal control', ['00:59:00;31'], None), ('normal control', ['01:60:00,02'], None)], [('regression: dropped frame total', ['23:00:00.02'], 2481518), ('regression variant: dropped frame total', ['09:01:00;03'], 972829), ('partial repair probe: dropped frame total', ['00:11:00.03'], 19783), ('partial repair variant: dropped frame total', ['01:01:00,02'], 109692), ('boundary control', ['00:00:59;29'], 1799), ('boundary control', ['00:01:00;00'], None), ('normal control', ['23:59:60,00'], None), ('normal control', ['01:59:00;01'], None), ('normal control', ['09:60:00:31'], None)], [('regression: dropped frame total', ['09:59:01.03'], 1077153), ('regression variant: dropped frame total', ['09:00:01.02'], 971060), ('partial repair probe: dropped frame total', ['01:09:59;03'], 125847), ('partial repair variant: dropped frame total', ['01:11:01;29'], 127731), ('boundary control', ['00:01:00;00'], None), ('boundary control', ['00:10:00;00'], 17982), ('normal control', ['01:11:01;30'], None), ('normal control', ['24:00:01.30'], None), ('normal control', ['23:00:01:29'], None)], [('regression: dropped frame total', ['23:10:01.01'], 2499529), ('regression variant: dropped frame total', ['01:59:01;29'], 214043), ('partial repair probe: dropped frame total', ['00:01:01;03'], 1831), ('partial repair variant: dropped frame total', ['23:09:00,15'], 2497713), ('boundary control', ['00:10:00;00'], 17982), ('boundary control', ['00:00:59;29'], 1799), ('normal control', ['23:09:00.00'], None), ('normal control', ['24:10:00,02'], None), ('normal control', ['00:60:59.29'], 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-dropped-frame-total","generated_at":"2026-09-29T14:49:35.023764+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.","repair":"Subtract two frames for every elapsed total minute except multiples of ten.","root_cause":"The dropped count uses the minute-of-hour instead of total minutes.","sha256":"e0a61f4adff9d5f5066624890d5db66784b6bb34f158563375d0b8844c93eb1a","title":"Drop-frame 29.97 label to frame count: dropped frame total · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.484,"exit_code":1,"observations":[{"actual":107892,"check":"regression: dropped frame total","expected":107892,"passed":true},{"actual":125849,"check":"regression variant: dropped frame total","expected":125847,"passed":false},{"actual":3571,"check":"partial repair probe: dropped frame total","expected":3569,"passed":false},{"actual":214045,"check":"partial repair variant: dropped frame total","expected":214043,"passed":false},{"actual":null,"check":"boundary control","expected":null,"passed":true},{"actual":17982,"check":"boundary control","expected":17982,"passed":true},{"actual":1799,"check":"normal control","expected":1799,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: dropped frame total\", \"actual\": 107892, \"expected\": 107892, \"passed\": true}, {\"check\": \"regression variant: dropped frame total\", \"actual\": 125849, \"expected\": 125847, \"passed\": false}, {\"check\": \"partial repair probe: dropped frame total\", \"actual\": 3571, \"expected\": 3569, \"passed\": false}, {\"check\": \"partial repair variant: dropped frame total\", \"actual\": 214045, \"expected\": 214043, \"passed\": false}, {\"check\": \"boundary control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"boundary control\", \"actual\": 17982, \"expected\": 17982, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1799, \"expected\": 1799, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.645,"exit_code":1,"observations":[{"actual":108000,"check":"regression: dropped frame total","expected":107892,"passed":false},{"actual":125955,"check":"regression variant: dropped frame total","expected":125847,"passed":false},{"actual":3569,"check":"partial repair probe: dropped frame total","expected":3569,"passed":true},{"actual":214151,"check":"partial repair variant: dropped frame total","expected":214043,"passed":false},{"actual":null,"check":"boundary control","expected":null,"passed":true},{"actual":17982,"check":"boundary control","expected":17982,"passed":true},{"actual":1799,"check":"normal control","expected":1799,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: dropped frame total\", \"actual\": 108000, \"expected\": 107892, \"passed\": false}, {\"check\": \"regression variant: dropped frame total\", \"actual\": 125955, \"expected\": 125847, \"passed\": false}, {\"check\": \"partial repair probe: dropped frame total\", \"actual\": 3569, \"expected\": 3569, \"passed\": true}, {\"check\": \"partial repair variant: dropped frame total\", \"actual\": 214151, \"expected\": 214043, \"passed\": false}, {\"check\": \"boundary control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"boundary control\", \"actual\": 17982, \"expected\": 17982, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1799, \"expected\": 1799, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":37.642,"exit_code":0,"observations":[{"actual":107892,"check":"regression: dropped frame total","expected":107892,"passed":true},{"actual":125847,"check":"regression variant: dropped frame total","expected":125847,"passed":true},{"actual":3569,"check":"partial repair probe: dropped frame total","expected":3569,"passed":true},{"actual":214043,"check":"partial repair variant: dropped frame total","expected":214043,"passed":true},{"actual":null,"check":"boundary control","expected":null,"passed":true},{"actual":17982,"check":"boundary control","expected":17982,"passed":true},{"actual":1799,"check":"normal control","expected":1799,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true},{"actual":null,"check":"normal control","expected":null,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: dropped frame total\", \"actual\": 107892, \"expected\": 107892, \"passed\": true}, {\"check\": \"regression variant: dropped frame total\", \"actual\": 125847, \"expected\": 125847, \"passed\": true}, {\"check\": \"partial repair probe: dropped frame total\", \"actual\": 3569, \"expected\": 3569, \"passed\": true}, {\"check\": \"partial repair variant: dropped frame total\", \"actual\": 214043, \"expected\": 214043, \"passed\": true}, {\"check\": \"boundary control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"boundary control\", \"actual\": 17982, \"expected\": 17982, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1799, \"expected\": 1799, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}