{
  "date": "2026-10-19",
  "scope": "Actual local FFmpeg WASM 0.12.10. Production GIF and accurate-trim argument builders. Input clips are user-supplied generated examples. No browser UI or processing-speed benchmark. MP4/GIF comparison is silent; car trim retains the source audio track. Original source framing and visible generation marks retained.",
  "inputs": [
    {
      "id": "penguin",
      "originalFilename": "Toy_penguin_bowing_on_table_20261019203711.mp4",
      "kind": "Operator-supplied Flow-generated sample, not camera footage",
      "filename": "penguin-source.mp4",
      "bytes": 1516676,
      "sha256": "28a4c103b8968b0a93d401911c4f091f668f442eab422232a902da119be74c8a",
      "metadata": [
        "  Duration: 00:00:08.00, start: 0.000000, bitrate: 1516 kb/s",
        "  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/iec61966-2-1, progressive), 1920x1080, 1355 kb/s, 24 fps, 24 tbr, 12288 tbn (default)",
        "  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)"
      ]
    },
    {
      "id": "pinwheel",
      "originalFilename": "Paper_pinwheel_rotating_in_garden_20261019203817.mp4",
      "kind": "Operator-supplied Flow-generated sample, not camera footage",
      "filename": "pinwheel-source.mp4",
      "bytes": 4022726,
      "sha256": "f3e84104144f68c8f23acdc595e7143d450bf81e4cd534e4b49ed2bca169ef73",
      "metadata": [
        "  Duration: 00:00:07.98, start: 0.000000, bitrate: 4033 kb/s",
        "  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/iec61966-2-1, progressive), 1920x1080, 3881 kb/s, 24 fps, 24 tbr, 12288 tbn (default)",
        "  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)"
      ]
    },
    {
      "id": "car",
      "originalFilename": "Red_toy_car_moving_1080p_20261019203917.mp4",
      "kind": "Operator-supplied Flow-generated sample, not camera footage",
      "filename": "car-source.mp4",
      "bytes": 1352199,
      "sha256": "56488f0e025a9897e8ceb7c4f834acae518966ecebbd65f9f95a3eaf3b777439",
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        "  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/iec61966-2-1, progressive), 1920x1080, 1190 kb/s, 24 fps, 24 tbr, 12288 tbn (default)",
        "  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)"
      ]
    }
  ],
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    "loop": {
      "id": "penguin-loop",
      "startSeconds": 0.5,
      "endSeconds": 3.5,
      "maxEdge": 480,
      "fps": 12,
      "width": 480,
      "height": 270,
      "filename": "penguin-loop.gif",
      "bytes": 977227,
      "sha256": "2b3aa528dab55dddfe22fb8223bf5ab0cb01fb5ebbf8c2948b0a7e51796819f4",
      "poster": {
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        "height": 270,
        "filename": "penguin-loop-poster.png",
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        "sha256": "d9eec430a5b5164efda198ea91352f8dde4693c5d290948d9830ba6edd85b996"
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    },
    "interrupted": {
      "id": "penguin-interrupted",
      "startSeconds": 1,
      "endSeconds": 2.4,
      "maxEdge": 480,
      "fps": 12,
      "width": 480,
      "height": 270,
      "filename": "penguin-interrupted.gif",
      "bytes": 467772,
      "sha256": "8d704ddfdf9eca150ecfaea803b13d774c5dba2f270d21ed815024efdc28d5da",
      "poster": {
        "width": 480,
        "height": 270,
        "filename": "penguin-interrupted-poster.png",
        "bytes": 56621,
        "sha256": "94388b364123cb0ac73aea44f89934d6735da8653869d612cd259118aa88ade4"
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    },
    "boundaries": [
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        "width": 480,
        "height": 270,
        "filename": "penguin-boundary-0.5.png",
        "bytes": 87210,
        "sha256": "5549dab004a9343e23c8faaba2f58d55a2785dcf5895dbc648b03cf1f18ddeb0"
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        "width": 480,
        "height": 270,
        "filename": "penguin-boundary-3.458333.png",
        "bytes": 94268,
        "sha256": "732087b0558b108c5a9680d28456f6cfb536e339f0b72db2d19fbae46fedc14d"
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      {
        "width": 480,
        "height": 270,
        "filename": "penguin-boundary-1.png",
        "bytes": 83019,
        "sha256": "f55b57254120eda5b15f46a9b773ac61f838548cca76081a4f2909f26a4edffb"
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      {
        "width": 480,
        "height": 270,
        "filename": "penguin-boundary-2.375.png",
        "bytes": 91203,
        "sha256": "29e8a6b4975c2129674ff663eb95198add5688a3695a693d352a517d655b755f"
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  },
  "pinwheel": [
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      "id": "pinwheel-compact",
      "startSeconds": 0,
      "endSeconds": 3,
      "maxEdge": 320,
      "fps": 8,
      "width": 320,
      "height": 180,
      "filename": "pinwheel-compact.gif",
      "bytes": 805730,
      "sha256": "2bea5ff91c6d72eecea7e4719a2baf3516f8a6ce40e7b0fedff9860d7a1c2dce",
      "poster": {
        "width": 320,
        "height": 180,
        "filename": "pinwheel-compact-poster.png",
        "bytes": 63122,
        "sha256": "1929ac244f7a63d259e1186df389995716dfc10c0793936448454df257e517b9"
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    },
    {
      "id": "pinwheel-balanced",
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      "endSeconds": 3,
      "maxEdge": 480,
      "fps": 12,
      "width": 480,
      "height": 270,
      "filename": "pinwheel-balanced.gif",
      "bytes": 2293495,
      "sha256": "ff0f94169a9b5f0ea5f9c07dc6b5f9480919e7adef840f13927d88c446856109",
      "poster": {
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        "height": 270,
        "filename": "pinwheel-balanced-poster.png",
        "bytes": 126285,
        "sha256": "b018ad89cdc5d19ffa0ed009b8e449131176eeddf7e8b97e5e677245e442b821"
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    },
    {
      "id": "pinwheel-smooth",
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      "endSeconds": 3,
      "maxEdge": 480,
      "fps": 20,
      "width": 480,
      "height": 270,
      "filename": "pinwheel-smooth.gif",
      "bytes": 3097716,
      "sha256": "94bd788ab30d15b876cbb4fbdd8ca0e088b7dc77491a50921348dd4cb86f9025",
      "poster": {
        "width": 480,
        "height": 270,
        "filename": "pinwheel-smooth-poster.png",
        "bytes": 125481,
        "sha256": "ad6b259b3a42e48a06f2c24ffbbce5dc73d1fd37230cfd481d34e0b6b27dbde2"
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    },
    {
      "id": "pinwheel-fps-only",
      "startSeconds": 0,
      "endSeconds": 3,
      "maxEdge": 480,
      "fps": 8,
      "width": 480,
      "height": 270,
      "filename": "pinwheel-fps-only.gif",
      "bytes": 1725065,
      "sha256": "d7c8c1556c902d46922fa05c196ef536df3b215cb69f68d478a639680c2f284e",
      "poster": {
        "width": 480,
        "height": 270,
        "filename": "pinwheel-fps-only-poster.png",
        "bytes": 127675,
        "sha256": "963d010aafa01545239d25231ecbf7a5e99d6974914a481b049419b8eb4de425"
      }
    },
    {
      "id": "pinwheel-edge-only",
      "startSeconds": 0,
      "endSeconds": 3,
      "maxEdge": 320,
      "fps": 12,
      "width": 320,
      "height": 180,
      "filename": "pinwheel-edge-only.gif",
      "bytes": 1071071,
      "sha256": "569b3a22ea908c3b96f8760c77b6b93a687e0939b96834cd034c1ed9de9786a2",
      "poster": {
        "width": 320,
        "height": 180,
        "filename": "pinwheel-edge-only-poster.png",
        "bytes": 62946,
        "sha256": "2a5c36a531d1fe60aeb10ffb19a09e511a1dccbd125bdc1d04371e390ba9868d"
      }
    },
    {
      "id": "pinwheel-shorter",
      "startSeconds": 0,
      "endSeconds": 1.5,
      "maxEdge": 480,
      "fps": 12,
      "width": 480,
      "height": 270,
      "filename": "pinwheel-shorter.gif",
      "bytes": 1152701,
      "sha256": "836d7be0687bbf7a486b288c6fa4f105d52e8269fddc6abc68acef02e567ba48",
      "poster": {
        "width": 480,
        "height": 270,
        "filename": "pinwheel-shorter-poster.png",
        "bytes": 126446,
        "sha256": "64ed951f726c10e758f96ed061aa291f1031918eb416411d1c8635cc0d2d2100"
      }
    }
  ],
  "mp4": {
    "filename": "pinwheel-comparison.mp4",
    "bytes": 135914,
    "sha256": "586c9477aa0b5502008f5501d52aed40950b4dc960b310fadb96024a59e2fdd9",
    "metadata": [
      "  Duration: 00:00:03.00, start: 0.000000, bitrate: 362 kb/s",
      "  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/iec61966-2-1, progressive), 480x270, 357 kb/s, 24 fps, 24 tbr, 12288 tbn (default)"
    ],
    "poster": {
      "width": 480,
      "height": 270,
      "filename": "pinwheel-comparison-poster.png",
      "bytes": 304824,
      "sha256": "cdadc3b3cfc8484c21d4eb24109fa32c0d58f3b2dc869d87e851490ad2da3403"
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  },
  "car": {
    "selection": {
      "startSeconds": 2.35,
      "endSeconds": 5.35,
      "quality": "balanced"
    },
    "accurate": {
      "filename": "car-accurate.mp4",
      "bytes": 372380,
      "sha256": "b1a2b83a52cef9c6f128a0276cf06756599b8e590c60fa949c4afe10a752ad7d",
      "metadata": [
        "  Duration: 00:00:03.00, start: 0.000000, bitrate: 993 kb/s",
        "  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/iec61966-2-1, progressive), 1920x1080, 854 kb/s, 24 fps, 24 tbr, 12288 tbn (default)",
        "  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)"
      ],
      "poster": {
        "width": 640,
        "height": 360,
        "filename": "car-accurate-poster.png",
        "bytes": 91352,
        "sha256": "24d8db0b3b9a4e9df01a09e24061e0fd47d1a39963f6c50773fed7d496879ac9"
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    },
    "fast": {
      "filename": "car-fast.mp4",
      "bytes": 987417,
      "sha256": "3967be8001ea171cb129ba9ac9308826ad4e5d12ba6a781d1a898b15a7704e83",
      "metadata": [
        "  Duration: 00:00:03.19, start: 0.000000, bitrate: 2474 kb/s",
        "  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/iec61966-2-1, progressive), 1920x1080, 1301 kb/s, 24 fps, 24 tbr, 12288 tbn (default)",
        "  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)"
      ],
      "poster": {
        "width": 640,
        "height": 360,
        "filename": "car-fast-poster.png",
        "bytes": 111358,
        "sha256": "f24d63237a97935dee2061e39ba36e952ea6976aee2946d9d59874d48c094774"
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    },
    "requestedStart": {
      "width": 640,
      "height": 360,
      "filename": "car-requested-start.png",
      "bytes": 111358,
      "sha256": "f24d63237a97935dee2061e39ba36e952ea6976aee2946d9d59874d48c094774"
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    "requestedEnd": {
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      "filename": "car-requested-end.png",
      "bytes": 103346,
      "sha256": "22f74bbcbe11eab67f4cd5f0108041c7ac1a57cb59d874da8628fed2e540c5c1"
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  },
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