{"abstract":"Negative footage counts print as positive footage.","category":"Broadcast timecode arithmetic","checks":9,"contract":"Frames per foot: 35mm4 16, 35mm2 32, 16mm 40. An int frame count converts to \"[-]F+ff\" (feet, two-digit frames, sign in front for negatives); a string \"[-]F+ff\" converts to a signed frame count, with ff below frames per foot (else None). \"-0+05\" means -5.","evaluation_group":"w2-broadcast-timecode-arithmetic-feet-frames","failed_approach":"Treating zero as negative prints \"-0+00\" for the head frame.","family":"w2-broadcast-timecode-arithmetic-feet-frames-negative-sign-emission","id":"FA-78516","implementations":{"attempt":{"sha256":"b32209768c8f036c633e415d3af3c13e841c4588a0549fb76870a8715692eed2","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(value, gauge):\n    per={'35mm4':16,'35mm2':32,'16mm':40}[gauge]\n    if isinstance(value,int):\n        sign='-' if value<=0 else ''\n        v=abs(value)\n        return '%s%d+%02d'%(sign,v//per,v%per)\n    ft,fr=value.split('+')\n    if int(fr)>=per:\n        return None\n    n=abs(int(ft))*per+int(fr)\n    return -n if ft.startswith('-') else n\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: negative sign emission', [-1, '35mm4'], '-0+01'), ('regression variant: negative sign emission', [-32, '35mm2'], '-1+00'), ('partial repair probe: negative sign emission', [0, '35mm4'], '0+00'), ('partial repair variant: negative sign emission', [0, '16mm'], '0+00'), ('boundary control', [16, '35mm4'], '1+00'), ('boundary control', ['0+16', '35mm4'], None), ('normal control', ['-0+05', '35mm4'], -5), ('normal control', ['2+39', '16mm'], 119), ('normal control', ['0+01', '35mm4'], 1)], [('regression: negative sign emission', [-1, '35mm2'], '-0+01'), ('regression variant: negative sign emission', [-5, '35mm2'], '-0+05'), ('partial repair probe: negative sign emission', [0, '16mm'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm2'], '0+00'), ('boundary control', ['-0+05', '35mm4'], -5), ('boundary control', ['2+39', '16mm'], 119), ('normal control', ['100+31', '35mm2'], 3231), ('normal control', ['100+16', '16mm'], 4016), ('normal control', ['-0+40', '16mm'], None)], [('regression: negative sign emission', [-43, '16mm'], '-1+03'), ('regression variant: negative sign emission', [-5, '35mm4'], '-0+05'), ('partial repair probe: negative sign emission', [0, '35mm2'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm4'], '0+00'), ('boundary control', ['1+15', '35mm4'], 31), ('boundary control', [16, '35mm4'], '1+00'), ('normal control', ['100+16', '35mm2'], 3216), ('normal control', ['1+00', '35mm4'], 16), ('normal control', ['1+20', '16mm'], 60)], [('regression: negative sign emission', [-5, '16mm'], '-0+05'), ('regression variant: negative sign emission', [-16, '35mm4'], '-1+00'), ('partial repair probe: negative sign emission', [0, '35mm4'], '0+00'), ('partial repair variant: negative sign emission', [0, '16mm'], '0+00'), ('boundary control', ['0+16', '35mm4'], None), ('boundary control', ['-0+05', '35mm4'], -5), ('normal control', ['0+20', '35mm4'], None), ('normal control', [1, '35mm2'], '0+01'), ('normal control', ['0+15', '35mm4'], 15)], [('regression: negative sign emission', [-40, '16mm'], '-1+00'), ('regression variant: negative sign emission', [-35, '35mm2'], '-1+03'), ('partial repair probe: negative sign emission', [0, '16mm'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm2'], '0+00'), ('boundary control', ['2+39', '16mm'], 119), ('boundary control', ['1+15', '35mm4'], 31), ('normal control', ['-0+15', '35mm4'], -15), ('normal control', ['-3+00', '35mm2'], -96), ('normal control', [999, '16mm'], '24+39')]]\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":"7eb93903bd900616e01748799cdea05245a1099da0625369b84210f2869cddd3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(value, gauge):\n    per={'35mm4':16,'35mm2':32,'16mm':40}[gauge]\n    if isinstance(value,int):\n        sign=''\n        v=abs(value)\n        return '%s%d+%02d'%(sign,v//per,v%per)\n    ft,fr=value.split('+')\n    if int(fr)>=per:\n        return None\n    n=abs(int(ft))*per+int(fr)\n    return -n if ft.startswith('-') else n\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: negative sign emission', [-1, '35mm4'], '-0+01'), ('regression variant: negative sign emission', [-32, '35mm2'], '-1+00'), ('partial repair probe: negative sign emission', [0, '35mm4'], '0+00'), ('partial repair variant: negative sign emission', [0, '16mm'], '0+00'), ('boundary control', [16, '35mm4'], '1+00'), ('boundary control', ['0+16', '35mm4'], None), ('normal control', ['-0+05', '35mm4'], -5), ('normal control', ['2+39', '16mm'], 119), ('normal control', ['0+01', '35mm4'], 1)], [('regression: negative sign emission', [-1, '35mm2'], '-0+01'), ('regression variant: negative sign emission', [-5, '35mm2'], '-0+05'), ('partial repair probe: negative sign emission', [0, '16mm'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm2'], '0+00'), ('boundary control', ['-0+05', '35mm4'], -5), ('boundary control', ['2+39', '16mm'], 119), ('normal control', ['100+31', '35mm2'], 3231), ('normal control', ['100+16', '16mm'], 4016), ('normal control', ['-0+40', '16mm'], None)], [('regression: negative sign emission', [-43, '16mm'], '-1+03'), ('regression variant: negative sign emission', [-5, '35mm4'], '-0+05'), ('partial repair probe: negative sign emission', [0, '35mm2'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm4'], '0+00'), ('boundary control', ['1+15', '35mm4'], 31), ('boundary control', [16, '35mm4'], '1+00'), ('normal control', ['100+16', '35mm2'], 3216), ('normal control', ['1+00', '35mm4'], 16), ('normal control', ['1+20', '16mm'], 60)], [('regression: negative sign emission', [-5, '16mm'], '-0+05'), ('regression variant: negative sign emission', [-16, '35mm4'], '-1+00'), ('partial repair probe: negative sign emission', [0, '35mm4'], '0+00'), ('partial repair variant: negative sign emission', [0, '16mm'], '0+00'), ('boundary control', ['0+16', '35mm4'], None), ('boundary control', ['-0+05', '35mm4'], -5), ('normal control', ['0+20', '35mm4'], None), ('normal control', [1, '35mm2'], '0+01'), ('normal control', ['0+15', '35mm4'], 15)], [('regression: negative sign emission', [-40, '16mm'], '-1+00'), ('regression variant: negative sign emission', [-35, '35mm2'], '-1+03'), ('partial repair probe: negative sign emission', [0, '16mm'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm2'], '0+00'), ('boundary control', ['2+39', '16mm'], 119), ('boundary control', ['1+15', '35mm4'], 31), ('normal control', ['-0+15', '35mm4'], -15), ('normal control', ['-3+00', '35mm2'], -96), ('normal control', [999, '16mm'], '24+39')]]\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":"809f6833d1aa915e9d7d1f9801fb891b14f753b9c6a83571d3a0e870b66a7ae0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(value, gauge):\n    per={'35mm4':16,'35mm2':32,'16mm':40}[gauge]\n    if isinstance(value,int):\n        sign='-' if value<0 else ''\n        v=abs(value)\n        return '%s%d+%02d'%(sign,v//per,v%per)\n    ft,fr=value.split('+')\n    if int(fr)>=per:\n        return None\n    n=abs(int(ft))*per+int(fr)\n    return -n if ft.startswith('-') else n\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: negative sign emission', [-1, '35mm4'], '-0+01'), ('regression variant: negative sign emission', [-32, '35mm2'], '-1+00'), ('partial repair probe: negative sign emission', [0, '35mm4'], '0+00'), ('partial repair variant: negative sign emission', [0, '16mm'], '0+00'), ('boundary control', [16, '35mm4'], '1+00'), ('boundary control', ['0+16', '35mm4'], None), ('normal control', ['-0+05', '35mm4'], -5), ('normal control', ['2+39', '16mm'], 119), ('normal control', ['0+01', '35mm4'], 1)], [('regression: negative sign emission', [-1, '35mm2'], '-0+01'), ('regression variant: negative sign emission', [-5, '35mm2'], '-0+05'), ('partial repair probe: negative sign emission', [0, '16mm'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm2'], '0+00'), ('boundary control', ['-0+05', '35mm4'], -5), ('boundary control', ['2+39', '16mm'], 119), ('normal control', ['100+31', '35mm2'], 3231), ('normal control', ['100+16', '16mm'], 4016), ('normal control', ['-0+40', '16mm'], None)], [('regression: negative sign emission', [-43, '16mm'], '-1+03'), ('regression variant: negative sign emission', [-5, '35mm4'], '-0+05'), ('partial repair probe: negative sign emission', [0, '35mm2'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm4'], '0+00'), ('boundary control', ['1+15', '35mm4'], 31), ('boundary control', [16, '35mm4'], '1+00'), ('normal control', ['100+16', '35mm2'], 3216), ('normal control', ['1+00', '35mm4'], 16), ('normal control', ['1+20', '16mm'], 60)], [('regression: negative sign emission', [-5, '16mm'], '-0+05'), ('regression variant: negative sign emission', [-16, '35mm4'], '-1+00'), ('partial repair probe: negative sign emission', [0, '35mm4'], '0+00'), ('partial repair variant: negative sign emission', [0, '16mm'], '0+00'), ('boundary control', ['0+16', '35mm4'], None), ('boundary control', ['-0+05', '35mm4'], -5), ('normal control', ['0+20', '35mm4'], None), ('normal control', [1, '35mm2'], '0+01'), ('normal control', ['0+15', '35mm4'], 15)], [('regression: negative sign emission', [-40, '16mm'], '-1+00'), ('regression variant: negative sign emission', [-35, '35mm2'], '-1+03'), ('partial repair probe: negative sign emission', [0, '16mm'], '0+00'), ('partial repair variant: negative sign emission', [0, '35mm2'], '0+00'), ('boundary control', ['2+39', '16mm'], 119), ('boundary control', ['1+15', '35mm4'], 31), ('normal control', ['-0+15', '35mm4'], -15), ('normal control', ['-3+00', '35mm2'], -96), ('normal control', [999, '16mm'], '24+39')]]\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-feet-frames-negative-sign-emission","generated_at":"2026-09-29T14:49:35.942971+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":"Prefix \"-\" exactly when the count is negative.","root_cause":"The sign is never emitted for negative counts.","sha256":"54a6244604530011a5cd565e494850c24b0aa37e7a7781b28c206a72faf0d63f","title":"Film feet and frames conversion: negative sign emission · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":38.854,"exit_code":1,"observations":[{"actual":"-0+01","check":"regression: negative sign emission","expected":"-0+01","passed":true},{"actual":"-1+00","check":"regression variant: negative sign emission","expected":"-1+00","passed":true},{"actual":"-0+00","check":"partial repair probe: negative sign emission","expected":"0+00","passed":false},{"actual":"-0+00","check":"partial repair variant: negative sign emission","expected":"0+00","passed":false},{"actual":"1+00","check":"boundary control","expected":"1+00","passed":true},{"actual":null,"check":"boundary control","expected":null,"passed":true},{"actual":-5,"check":"normal control","expected":-5,"passed":true},{"actual":119,"check":"normal control","expected":119,"passed":true},{"actual":1,"check":"normal control","expected":1,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: negative sign emission\", \"actual\": \"-0+01\", \"expected\": \"-0+01\", \"passed\": true}, {\"check\": \"regression variant: negative sign emission\", \"actual\": \"-1+00\", \"expected\": \"-1+00\", \"passed\": true}, {\"check\": \"partial repair probe: negative sign emission\", \"actual\": \"-0+00\", \"expected\": \"0+00\", \"passed\": false}, {\"check\": \"partial repair variant: negative sign emission\", \"actual\": \"-0+00\", \"expected\": \"0+00\", \"passed\": false}, {\"check\": \"boundary control\", \"actual\": \"1+00\", \"expected\": \"1+00\", \"passed\": true}, {\"check\": \"boundary control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": -5, \"expected\": -5, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 119, \"expected\": 119, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1, \"expected\": 1, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.46,"exit_code":1,"observations":[{"actual":"0+01","check":"regression: negative sign emission","expected":"-0+01","passed":false},{"actual":"1+00","check":"regression variant: negative sign emission","expected":"-1+00","passed":false},{"actual":"0+00","check":"partial repair probe: negative sign emission","expected":"0+00","passed":true},{"actual":"0+00","check":"partial repair variant: negative sign emission","expected":"0+00","passed":true},{"actual":"1+00","check":"boundary control","expected":"1+00","passed":true},{"actual":null,"check":"boundary control","expected":null,"passed":true},{"actual":-5,"check":"normal control","expected":-5,"passed":true},{"actual":119,"check":"normal control","expected":119,"passed":true},{"actual":1,"check":"normal control","expected":1,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: negative sign emission\", \"actual\": \"0+01\", \"expected\": \"-0+01\", \"passed\": false}, {\"check\": \"regression variant: negative sign emission\", \"actual\": \"1+00\", \"expected\": \"-1+00\", \"passed\": false}, {\"check\": \"partial repair probe: negative sign emission\", \"actual\": \"0+00\", \"expected\": \"0+00\", \"passed\": true}, {\"check\": \"partial repair variant: negative sign emission\", \"actual\": \"0+00\", \"expected\": \"0+00\", \"passed\": true}, {\"check\": \"boundary control\", \"actual\": \"1+00\", \"expected\": \"1+00\", \"passed\": true}, {\"check\": \"boundary control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": -5, \"expected\": -5, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 119, \"expected\": 119, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1, \"expected\": 1, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":38.7,"exit_code":0,"observations":[{"actual":"-0+01","check":"regression: negative sign emission","expected":"-0+01","passed":true},{"actual":"-1+00","check":"regression variant: negative sign emission","expected":"-1+00","passed":true},{"actual":"0+00","check":"partial repair probe: negative sign emission","expected":"0+00","passed":true},{"actual":"0+00","check":"partial repair variant: negative sign emission","expected":"0+00","passed":true},{"actual":"1+00","check":"boundary control","expected":"1+00","passed":true},{"actual":null,"check":"boundary control","expected":null,"passed":true},{"actual":-5,"check":"normal control","expected":-5,"passed":true},{"actual":119,"check":"normal control","expected":119,"passed":true},{"actual":1,"check":"normal control","expected":1,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: negative sign emission\", \"actual\": \"-0+01\", \"expected\": \"-0+01\", \"passed\": true}, {\"check\": \"regression variant: negative sign emission\", \"actual\": \"-1+00\", \"expected\": \"-1+00\", \"passed\": true}, {\"check\": \"partial repair probe: negative sign emission\", \"actual\": \"0+00\", \"expected\": \"0+00\", \"passed\": true}, {\"check\": \"partial repair variant: negative sign emission\", \"actual\": \"0+00\", \"expected\": \"0+00\", \"passed\": true}, {\"check\": \"boundary control\", \"actual\": \"1+00\", \"expected\": \"1+00\", \"passed\": true}, {\"check\": \"boundary control\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"normal control\", \"actual\": -5, \"expected\": -5, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 119, \"expected\": 119, \"passed\": true}, {\"check\": \"normal control\", \"actual\": 1, \"expected\": 1, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}