{"abstract":"An absolute sequence number is applied as a local array slice offset.","category":"Streaming segment lifecycle","checks":4,"contract":"Drop segments older than an absolute first available media sequence, retaining the boundary sequence.","evaluation_group":"xmed-live-window-prune-absolute-sequence","failed_approach":"Strict comparison discards the earliest still-available segment.","family":"xmed-live-window-prune-absolute-sequence","id":"FA-11111","implementations":{"attempt":{"sha256":"837567e729cdb5c9b8d33e847853c5bb145d260b693fa47cccaadb585abc92eb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(segments, first_sequence):\n    return [x for x in segments if x[0]>first_sequence]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([[100, 'a'], [101, 'b'], [102, 'c']], 101)),[[101, 'b'], [102, 'c']])\ncheck('fixture 2',solve(*([[5, 'x']], 5)),[[5, 'x']])\ncheck('fixture 3',solve(*([[5, 'x']], 6)),[])\ncheck('fixture 4',solve(*([], 0)),[])\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":"ffb55672c10a6a33cedf93de4e167531f5fe25dc939e1aba3ed8caf89be5af6a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(segments, first_sequence):\n    return segments[first_sequence:]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([[100, 'a'], [101, 'b'], [102, 'c']], 101)),[[101, 'b'], [102, 'c']])\ncheck('fixture 2',solve(*([[5, 'x']], 5)),[[5, 'x']])\ncheck('fixture 3',solve(*([[5, 'x']], 6)),[])\ncheck('fixture 4',solve(*([], 0)),[])\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":"c1413b5a76bfc47b6b4f36012596fb3c19bb5b9e5a0ca815d4a1d05b201c5f59","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(segments, first_sequence):\n    return [x for x in segments if x[0]>=first_sequence]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([[100, 'a'], [101, 'b'], [102, 'c']], 101)),[[101, 'b'], [102, 'c']])\ncheck('fixture 2',solve(*([[5, 'x']], 5)),[[5, 'x']])\ncheck('fixture 3',solve(*([[5, 'x']], 6)),[])\ncheck('fixture 4',solve(*([], 0)),[])\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":" 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":"xmed-live-window-prune-absolute-sequence","generated_at":"2026-09-29T14:38:44.995587+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic local media controller stage; metadata and downloaded data are supplied explicitly. No external player, service or codec is required.","repair":"Preserve the media contract: Drop segments older than an absolute first available media sequence, retaining the boundary sequence.","root_cause":"An absolute sequence number is applied as a local array slice offset.","sha256":"611c2d38c70897490a5b8a7e4822afe96f6799282e3889bf1193b16e0a7ae03d","title":"Live window prune absolute sequence · case 01","variant":1,"variant_policy":"The five numbered cases rerun the same authored boundary fixtures; they are reproducibility runs, not independent input variants.","verification":{"attempt":{"elapsed_ms":38.564,"exit_code":1,"observations":[{"actual":[[102,"c"]],"check":"fixture 1","expected":[[101,"b"],[102,"c"]],"passed":false},{"actual":[],"check":"fixture 2","expected":[[5,"x"]],"passed":false},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":[],"check":"fixture 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [[102, \"c\"]], \"expected\": [[101, \"b\"], [102, \"c\"]], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [], \"expected\": [[5, \"x\"]], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.637,"exit_code":1,"observations":[{"actual":[],"check":"fixture 1","expected":[[101,"b"],[102,"c"]],"passed":false},{"actual":[],"check":"fixture 2","expected":[[5,"x"]],"passed":false},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":[],"check":"fixture 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [], \"expected\": [[101, \"b\"], [102, \"c\"]], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [], \"expected\": [[5, \"x\"]], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":37.811,"exit_code":0,"observations":[{"actual":[[101,"b"],[102,"c"]],"check":"fixture 1","expected":[[101,"b"],[102,"c"]],"passed":true},{"actual":[[5,"x"]],"check":"fixture 2","expected":[[5,"x"]],"passed":true},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":[],"check":"fixture 4","expected":[],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [[101, \"b\"], [102, \"c\"]], \"expected\": [[101, \"b\"], [102, \"c\"]], \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": [[5, \"x\"]], \"expected\": [[5, \"x\"]], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}