{
  "env": {
    "date": "2026-11-04T17:25:52Z",
    "cpu": "Apple M5",
    "cores": "10 total (4 performance + 6 efficiency)",
    "memory_gb": "16",
    "os": "darwin 26.5.1",
    "ffmpeg": "9.0.2",
    "go": "go1.26.4",
    "power": "AC power",
    "low_power_mode": "off",
    "load_avg_before": "{ 2.39 6.45 10.33 }",
    "input": "bbb_1080p30.mp4",
    "input_seconds": 634.6,
    "input_sha256": "ae51005850b0ff757fe60c3dd7a12d754d3cd2397d87d939b55235e457f97658",
    "encode": "H.264 libx264 -preset veryfast -crf 23, scaled to 720p, AAC 128k; 1 thread per ffmpeg in segmented runs",
    "notes": [
      "max_child_rss_mb is 0 for runs recorded before the per-process RSS fix: getrusage(RUSAGE_CHILDREN).ru_maxrss is the largest child over the whole benchmark process, not per run. Per-process peak memory comes from the \"memory\" scenario.",
      "Machine is a fanless MacBook Air (Mac17,3). Sustained all-core load lowers clocks: the same plain-ffmpeg encode took 29.8 s on a cool chip and 43.6-45.4 s once warm. Repetitions were interleaved across configurations so every configuration saw similar thermal conditions; medians are reported."
    ]
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