{
  "measured_at_utc": "2026-10-29T04:14:08.535661+00:00",
  "purpose": "One real-video fixture plus constructed audio controls; not model failure-rate evidence.",
  "source": {
    "path": "/seo/2026-09-04-ai-image-and-video/product-agnes-video.mp4",
    "sha256": "7b2e64fbd62b5a071487ec87771efc1b5fc8aea2059b52cdb16b078a4e033305",
    "video_duration_seconds": 5.166667,
    "width": 704,
    "height": 704,
    "frame_rate": "24/1",
    "video_frames": 124
  },
  "tools": {
    "ffmpeg_version": "ffmpeg version 7.1-essentials_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers",
    "ffprobe_version": "ffprobe version 2023-02-13-git-2296078397-essentials_build-www.gyan.dev Copyright (c) 2007-2023 the FFmpeg developers"
  },
  "method": {
    "audio_selection": "Entire first audio stream, decoded without seeking or time limit. Repeat for other streams when present.",
    "silencedetect_noise_dbfs": -60,
    "silencedetect_minimum_duration_seconds": 0.5,
    "digital_silence_check": "Positive sample count and all decoded float32 sample values exactly zero.",
    "video_packets_preserved": true,
    "aac_padding_note": "AAC controls decode to 5.184 seconds; the video lasts 5.166667 seconds."
  },
  "limits": [
    "One source video and constructed audio controls; no AI generation used.",
    "One FFmpeg build and one ffprobe build on Windows.",
    "No browser playback, listening study or perceptual audibility claim.",
    "Finite signal levels do not establish speech, music, or acceptable audio quality.",
    "volumedetect -91 dB observed here does not distinguish exact zeros from a nonzero -100 dBFS control.",
    "Threshold silence is not proof of all-zero samples."
  ],
  "measurements": [
    {
      "id": "original-real-video",
      "label": "Existing real product video",
      "file_name": "product-agnes-video.mp4",
      "bytes": 272836,
      "sha256": "7b2e64fbd62b5a071487ec87771efc1b5fc8aea2059b52cdb16b078a4e033305",
      "audio_streams": [
        {
          "index": 1,
          "codec_name": "aac",
          "sample_fmt": "fltp",
          "sample_rate": "32000",
          "channels": 2,
          "channel_layout": "stereo",
          "duration": "5.175000"
        }
      ],
      "video_packet_sha256": "7a10c15c1262ed88ad1ca6ca77a9bf163fa52c2569a1f11a42a7f0eb006014af",
      "volumedetect": {
        "mean_db": -13.5,
        "max_db": -0.0
      },
      "astats_overall": {
        "peak_dbfs": -0.001202,
        "rms_dbfs": -13.532105,
        "minimum_sample": -0.997513,
        "maximum_sample": 0.999862,
        "samples_per_channel": 165888.0
      },
      "silencedetect_intervals": [],
      "decoded_float_samples": {
        "sample_values": 331776,
        "nonzero_values": 331776,
        "all_exactly_zero": false,
        "minimum": -0.9975128173828125,
        "maximum": 0.9998616576194763,
        "decoded_duration_seconds": 5.184,
        "first_channel_upward_zero_crossings": 2544,
        "crossings_per_second": 490.7407407407407,
        "raw_f32le_sha256": "3df1234fa160fbbfc7a5d322e0d08aa2e1cd010f5e303412c706c3741e661f48"
      },
      "diagnostic_exit_codes": {
        "volumedetect": 0,
        "astats": 0,
        "silencedetect": 0
      }
    },
    {
      "id": "no-audio",
      "label": "Real video with original audio removed",
      "file_name": "no-audio.mp4",
      "bytes": 183065,
      "sha256": "a0cc2b8962f74f147c49991bcd56c24c6c8da3d9e6439e5542c69c721483c2ae",
      "audio_streams": [],
      "video_packet_sha256": "7a10c15c1262ed88ad1ca6ca77a9bf163fa52c2569a1f11a42a7f0eb006014af",
      "volumedetect": {
        "mean_db": null,
        "max_db": null
      },
      "astats_overall": {
        "peak_dbfs": null,
        "rms_dbfs": null,
        "minimum_sample": null,
        "maximum_sample": null,
        "samples_per_channel": null
      },
      "silencedetect_intervals": [],
      "decoded_float_samples": null,
      "diagnostic_exit_codes": {
        "volumedetect": 4294967274,
        "astats": 4294967274,
        "silencedetect": 4294967274
      }
    },
    {
      "id": "silent-track",
      "label": "Real video plus synthetic all-zero AAC track",
      "file_name": "silent-track.mp4",
      "bytes": 186735,
      "sha256": "5e231dc99660c99c57803b8f14c78b14f0a3bf507ddc64b4a44c3f5bc0307cc8",
      "audio_streams": [
        {
          "index": 1,
          "codec_name": "aac",
          "sample_fmt": "fltp",
          "sample_rate": "48000",
          "channels": 1,
          "channel_layout": "mono",
          "duration": "5.166000"
        }
      ],
      "video_packet_sha256": "7a10c15c1262ed88ad1ca6ca77a9bf163fa52c2569a1f11a42a7f0eb006014af",
      "volumedetect": {
        "mean_db": -91.0,
        "max_db": -91.0
      },
      "astats_overall": {
        "peak_dbfs": "-inf",
        "rms_dbfs": "-inf",
        "minimum_sample": 0.0,
        "maximum_sample": 0.0,
        "samples_per_channel": 248832.0
      },
      "silencedetect_intervals": [
        {
          "start_seconds": 0.0,
          "end_seconds": 5.184,
          "duration_seconds": 5.184
        }
      ],
      "decoded_float_samples": {
        "sample_values": 248832,
        "nonzero_values": 0,
        "all_exactly_zero": true,
        "minimum": 0.0,
        "maximum": 0.0,
        "decoded_duration_seconds": 5.184,
        "first_channel_upward_zero_crossings": 0,
        "crossings_per_second": 0.0,
        "raw_f32le_sha256": "b63322dc5218bc7fc550c5f71580715126c6862cd513aa7d163c047d5f2f03e9"
      },
      "diagnostic_exit_codes": {
        "volumedetect": 0,
        "astats": 0,
        "silencedetect": 0
      }
    },
    {
      "id": "audible-tone",
      "label": "Real video plus synthetic 440 Hz AAC tone",
      "file_name": "audible-tone.mp4",
      "bytes": 267756,
      "sha256": "4829a1d64331e0ed5d3ab13ab445fd0d49b9cee26080f2b095826c697049ea4c",
      "audio_streams": [
        {
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          "codec_name": "aac",
          "sample_fmt": "fltp",
          "sample_rate": "48000",
          "channels": 1,
          "channel_layout": "mono",
          "duration": "5.166000"
        }
      ],
      "video_packet_sha256": "7a10c15c1262ed88ad1ca6ca77a9bf163fa52c2569a1f11a42a7f0eb006014af",
      "volumedetect": {
        "mean_db": -21.1,
        "max_db": -16.3
      },
      "astats_overall": {
        "peak_dbfs": -16.318709,
        "rms_dbfs": -21.091825,
        "minimum_sample": -0.152779,
        "maximum_sample": 0.145477,
        "samples_per_channel": 248832.0
      },
      "silencedetect_intervals": [],
      "decoded_float_samples": {
        "sample_values": 248832,
        "nonzero_values": 248128,
        "all_exactly_zero": false,
        "minimum": -0.15277931094169617,
        "maximum": 0.14547674357891083,
        "decoded_duration_seconds": 5.184,
        "first_channel_upward_zero_crossings": 2278,
        "crossings_per_second": 439.429012345679,
        "raw_f32le_sha256": "b57324a97e1dc1584a6e7aa37b863dc2556c13e371342625f7a6d9ed4ea82da9"
      },
      "diagnostic_exit_codes": {
        "volumedetect": 0,
        "astats": 0,
        "silencedetect": 0
      }
    },
    {
      "id": "quiet-nonzero-tone",
      "label": "Real video plus synthetic 440 Hz float-PCM tone scaled by 0.00008",
      "file_name": "quiet-nonzero-tone.mov",
      "bytes": 1176679,
      "sha256": "1004b3af70646daeb27b0d3db227abcf0b8e83bc7dc5092938276b5693e81766",
      "audio_streams": [
        {
          "index": 1,
          "codec_name": "pcm_f32le",
          "sample_fmt": "flt",
          "sample_rate": "48000",
          "channels": 1,
          "channel_layout": "mono",
          "duration": "5.166667"
        }
      ],
      "video_packet_sha256": "7a10c15c1262ed88ad1ca6ca77a9bf163fa52c2569a1f11a42a7f0eb006014af",
      "volumedetect": {
        "mean_db": -91.0,
        "max_db": -91.0
      },
      "astats_overall": {
        "peak_dbfs": -100.002121,
        "rms_dbfs": -103.012116,
        "minimum_sample": -1e-05,
        "maximum_sample": 1e-05,
        "samples_per_channel": 248000.0
      },
      "silencedetect_intervals": [
        {
          "start_seconds": 0.0,
          "end_seconds": 5.166667,
          "duration_seconds": 5.166667
        }
      ],
      "decoded_float_samples": {
        "sample_values": 248000,
        "nonzero_values": 247586,
        "all_exactly_zero": false,
        "minimum": -9.997558663599193e-06,
        "maximum": 9.997558663599193e-06,
        "decoded_duration_seconds": 5.166666666666667,
        "first_channel_upward_zero_crossings": 2274,
        "crossings_per_second": 440.1290322580645,
        "raw_f32le_sha256": "553bd4a45a43136260d3c694a26303a27c043b1b2eeddb016aa58ca74641c752"
      },
      "diagnostic_exit_codes": {
        "volumedetect": 0,
        "astats": 0,
        "silencedetect": 0
      }
    }
  ]
}