{ "schemaVersion": 3, "role": "Browser replay derivatives; never archival masters", "timelineOriginLocal": "2026-08-12T18:29:57+01:00", "syncStatus": "network-synchronized working alignment", "syncCaveat": "Acquisition devices were operating with network-synchronized system time. Source filenames provide nominal first-frame WEST timestamps. Alignment is operationally reliable for event reconstruction but was not independently verified against a dedicated precision timing reference.", "witnessProvenance": { "observer": "CosmoNutz", "system": "Seestar telescope acquisition system", "locationPublic": "Vila Praia de Âncora area, northern Portugal", "locationPrecision": "locality", "exactLocationPublished": false, "responsibility": "Teófilo Couto · telescope acquisition, replay engineering, and archive preservation" }, "referenceEvents": { "espinhoFirstContact": "2026-08-12T18:35:08+01:00", "firstEdsObservation": "2026-08-12T18:35:22+01:00", "espinhoPredictedMaximum": "2026-08-12T19:32:14+01:00", "edsMinimum": "2026-08-12T19:32:22+01:00", "cameraEnd": "2026-08-12T19:55:38+01:00", "scope": "Astronomical contacts and predicted maximum describe EDS / Espinho circumstances; no telescope-local maximum is claimed." }, "sourcePolicy": { "originalsPublishedHere": false, "originalsImmutable": true, "sourcePathsPublished": false, "maximumSourceRescue": "A separately preserved lossless FFV1/Matroska rescue remains the required input for future Maximum regeneration. The Phase 4 read-only forensic inspection used the available uncompressed 8-bit grayscale AVI because the rescue file was not locally available; no web candidate was generated from that AVI." }, "mediaContract": { "container": "MP4 with moov before mdat", "video": "H.264/AVC High profile, level 4.1 or lower, yuv420p, 720×1280", "audioStreams": 0, "cadence": { "approach": "30 fps CFR derived from a nominal-30 source with sub-frame acquisition jitter; no interpolation", "maximum": "Preserve native 10000000/870557 CFR (approximately 11.4869 fps); never manufacture 30 fps", "recovery": "30 fps CFR derived from a nominal-30 source with sub-frame acquisition jitter; no interpolation" }, "maximumKeyframeGapSeconds": {"approach": 2.05, "maximum": 2.1, "recovery": 2.05}, "durationToleranceSeconds": {"approach": 0.05, "maximum": 0.01, "recovery": 0.05}, "frameCountTolerance": {"approach": 1, "maximum": 0, "recovery": 1}, "eventFrameTolerance": "nearest output frame plus 2 ms; no astronomical precision claim", "seekAcceptance": "20 deterministic forward/backward positions per proxy, cold and warm cache, with no failures, no stale frame at completion, reliable resume, and measurable browser responsiveness", "posterPolicy": "No crop or aspect-ratio change; event posters must remain visually consistent with the aligned output frame." }, "currentFiles": [ { "id": "approach", "path": "approach-web.mp4", "sourceLineage": { "publicId": "approach-archival-master", "sha256": "e1c4491269c74511f31a36aa5ceea82de58441935ec572a913c71fb408abd73e", "nativeCadence": "nominal 30 fps with bounded timestamp jitter; observed VFR intervals 0.031456–0.035233 s", "durationSeconds": 3457.598156, "frameCount": 103730 }, "container": "MP4", "codec": "H.264/AVC (avc1)", "profile": "High", "level": "4.1", "pixelFormat": "yuv420p", "dimensions": "720×1280", "colorMetadata": "not signaled", "timeBase": "1/15360", "rFrameRate": "30/1", "avgFrameRate": "30/1", "cadenceStatus": "CFR", "frameCount": 103729, "startTimeSeconds": 0.0, "durationSeconds": 3457.633333, "timelineMapping": {"masterStartSeconds": 0.0, "masterEndFromSourceSeconds": 3457.598156, "followingCameraGapSeconds": 2.401844}, "keyframes": {"count": 1729, "minimumGapSeconds": 2.0, "medianGapSeconds": 2.0, "p95GapSeconds": 2.0, "maximumGapSeconds": 2.0, "tailSeconds": 1.633333}, "fastStart": true, "audioStreams": 0, "bytes": 187304550, "sha256": "5cc43c00f23a4cafcef6c6c049e9cbb397c5bd4623f0d413f207a0ac46bbaf58", "generation": { "exactCommandAvailable": true, "commandPublicSafe": "ffmpeg -hide_banner -nostdin -n -fflags +bitexact -i '{source:approach}' -map 0:v:0 -map_metadata -1 -map_chapters -1 -an -vf fps=30,scale=720:1280:flags=lanczos,format=yuv420p -c:v libx264 -preset slow -crf 20 -profile:v high -level:v 4.1 -g 60 -keyint_min 60 -sc_threshold 0 -flags:v +cgop+bitexact -force_key_frames 'expr:gte(t,n_forced*2)' -movflags +faststart -fps_mode cfr '{review-output:approach-web-candidate.mp4}'", "ffmpegVersion": "8.1.2", "ffprobeVersion": "8.1.2", "candidateManifestSha256": "e7968f0d92090694c6d04a0435fa3ab545d291875fefa8e5953e277a2b56755a", "publishedReplacementLineage": "Phase 4 approved candidate published selectively to the stable Approach web-derivative path in Phase 4.1" }, "validation": { "status": "passed", "reason": "duration, frame count, 30 fps CFR cadence, two-second GOP, fast-start, silent playback, event-frame mapping, and browser seeking verified", "phase4CandidateContract": true, "phase4_1PrepublicationReinspection": true }, "publicationHistory": [ { "status": "previous-public-proxy", "bytes": 163420175, "sha256": "969d11f4335a966cde6035a842c85c51e17fb37a82e000e6a7290f1e0e5593b1", "level": "3.1", "keyframes": {"count": 642, "medianGapSeconds": 5.0, "p95GapSeconds": 8.333334, "maximumGapSeconds": 8.333334, "tailSeconds": 2.1}, "rollback": "Preserved outside the public runtime artifact; storage path intentionally not published" }, { "status": "current-published-web-derivative", "publishedOn": "2026-08-21", "bytes": 187304550, "sha256": "5cc43c00f23a4cafcef6c6c049e9cbb397c5bd4623f0d413f207a0ac46bbaf58", "maximumKeyframeGapSeconds": 2.0 } ] }, { "id": "maximum", "path": "maximum-web.mp4", "sourceLineage": { "publicId": "maximum-uncompressed-grayscale-master", "sha256": "38aa12f0327271b01616d94ab2af718890c014401db7439e01bd7ae60f259975", "nativeCadence": "fixed 870557/10000000-second frame tick (approximately 11.4869 fps)", "durationSeconds": 600.07494, "frameCount": 6893 }, "container": "MP4", "codec": "H.264/AVC (avc1)", "profile": "High", "level": "3.1", "pixelFormat": "yuv420p", "dimensions": "720×1280", "colorMetadata": "not signaled", "timeBase": "1/636535", "rFrameRate": "636535/55414", "avgFrameRate": "636535/55414", "cadenceStatus": "CFR", "frameCount": 6893, "startTimeSeconds": 0.0, "durationSeconds": 600.07494, "timelineMapping": {"masterStartSeconds": 3460.0, "masterEndSeconds": 4060.07494, "precedingCameraGapSeconds": 2.401844, "followingCameraGapSeconds": 6.92506}, "keyframes": {"count": 288, "minimumGapSeconds": 2.089336, "medianGapSeconds": 2.089337, "p95GapSeconds": 2.089337, "maximumGapSeconds": 2.089337, "tailSeconds": 0.435278}, "fastStart": true, "audioStreams": 0, "bytes": 139323981, "sha256": "d8874fd38df739296b7147730f2993949e6bfda8e9d4334b8bbf9665cafc226b", "generation": {"exactCommandAvailable": false, "cadenceExplanation": "The MP4 muxer represents the preserved native cadence as 636535/55414. This equals 6893 frames over 600.074940 seconds and is not malformed or VFR."}, "validation": {"status": "passed", "reason": "native cadence, duration, frame count, two-second-class GOP, fast-start, and browser decoding verified"} }, { "id": "recovery", "path": "recovery-web.mp4", "sourceLineage": { "publicId": "recovery-archival-master", "sha256": "03d608bf1657e904b46e27d586cdca2caa6596df9e1304ea4a204e28a9cd5103", "nativeCadence": "nominal 30 fps with bounded timestamp jitter; observed VFR intervals 0.031622–0.035056 s", "durationSeconds": 1074.789844, "frameCount": 32245 }, "container": "MP4", "codec": "H.264/AVC (avc1)", "profile": "High", "level": "3.1", "pixelFormat": "yuv420p", "dimensions": "720×1280", "colorMetadata": "not signaled", "timeBase": "1/15360", "rFrameRate": "30/1", "avgFrameRate": "30/1", "cadenceStatus": "CFR", "frameCount": 32245, "startTimeSeconds": 0.0, "durationSeconds": 1074.833333, "timelineMapping": {"masterStartSeconds": 4067.0, "masterEndFromSourceSeconds": 5141.789844, "precedingCameraGapSeconds": 6.92506}, "keyframes": {"count": 538, "minimumGapSeconds": 2.0, "medianGapSeconds": 2.0, "p95GapSeconds": 2.0, "maximumGapSeconds": 2.0, "tailSeconds": 0.833333}, "fastStart": true, "audioStreams": 0, "bytes": 30678278, "sha256": "7047b853950660685991535298d71c916aa37b59b4cbc2b82a1b31861f3041e2", "generation": {"exactCommandAvailable": false, "containerEncoderTag": "Lavf63.6.100", "videoEncoderTag": "Lavc63.8.101 libx264"}, "validation": {"status": "passed", "reason": "duration, frame count, two-second GOP, fast-start, and browser decoding verified"} } ], "generation": { "script": "/scripts/generate_replay_proxies.py", "toolingValidatedWith": "FFmpeg and FFprobe 8.1.2", "outputPolicy": "Candidates only in an absent or empty non-public review directory; source paths and approved public proxies are denied as destinations; no overwrite is permitted.", "validationPolicy": "Generation fails on codec/profile/level, pixel format, dimensions, audio, fast-start, cadence, duration, frame-count, keyframe-gap, timestamp-order, or event-frame contract violations." }, "replacementReview": { "status": "selective-replacement-approved-and-published-to-release-candidate", "approvedOn": "2026-08-21", "humanReviewCompleted": true, "published": { "id": "approach", "path": "approach-web.mp4", "sha256": "5cc43c00f23a4cafcef6c6c049e9cbb397c5bd4623f0d413f207a0ac46bbaf58", "bytes": 187304550, "maximumKeyframeGapSeconds": 2.0, "validation": "passed" }, "retained": { "maximum": "Retained because its approximately 11.4869 fps value is genuine native constant cadence and its two-second-class GOP already complies", "recovery": "Retained because it already complies with the 30 fps CFR and exact two-second-GOP contract" }, "previousApproach": { "sha256": "969d11f4335a966cde6035a842c85c51e17fb37a82e000e6a7290f1e0e5593b1", "bytes": 163420175, "rollbackPreservedOutsidePublicArtifact": true }, "productionDeploymentPerformed": false } }