{
  "assessmentId": "AVATAR-SOURCE-2026-09-07",
  "reviewDate": "2026-09-07",
  "method": "Review of a pinned source commit and historical note; arithmetic from declared model sizes; a new browser experiment executing the exact encoder/audio decoder on original test cards and synthetic tones, independently checked with FFmpeg. No model download or neural inference was run.",
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  "upstreamRepository": "https://github.com/MartinDelophy/ai-video-editor",
  "modelRevision": "a201b681c8f96672b5c3f624e32d4dc932f150af",
  "modelRepository": "https://huggingface.co/haixin/timeline-studio-onnx-models/tree/a201b681c8f96672b5c3f624e32d4dc932f150af",
  "downloadEstimate": {
    "method": "Sum of configured knownArtifacts bytes, not observed network traffic or resident memory.",
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    "livePortraitPreviewBytes": 326845205,
    "previewTotalBytes": 738879580,
    "additionalQualityGeneratorBytes": 210713678,
    "bothTiersTotalBytes": 949593258,
    "excludes": [
      "ONNX Runtime JavaScript/WebAssembly",
      "Application assets",
      "Browser/GPU working memory",
      "HTTP transport overhead"
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  "sourceBoundaries": {
    "maximumAudioSeconds": 4,
    "maximumVideoSeconds": 4,
    "previewPixels": [
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    "qualityPixels": [
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    "defaultEncodedFps": 8,
    "defaultNeuralKeyframeTargetFps": 2,
    "playbackSampling": "Nearest neural-keyframe image reused at each encoded timestamp; no optical-flow or synthesized in-between frames.",
    "intermediateWebmAudioTrack": false,
    "frameGuards": "Finite/extreme/variance/distance checks and a retry; not identity, phoneme or lip-sync validation."
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  "historicalNote": {
    "reportedClipSeconds": 3.56,
    "reported512pxNeuralSecondsPerFrame": [
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    "scope": "Values copied from the earlier engineering note, not reproduced now. Browser version, GPU name, original voiceover, encoded clip and full timing log are not provided in that note.",
    "publication": "No audiovisual output from that historical run is republished as verified evidence."
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  "hypotheticalRenderBudget": {
    "method": "Maximum adaptive keyframe budget ceil(duration * 2) + 1 multiplied by historical per-frame cost; illustrative planning bound, not prediction or measurement. Excludes setup, JoyVASA, encoding and retries. Applies only to the historical 512px rate, not 256px preview.",
    "oneSecondAtMost3FramesSeconds": [
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    "quality": "256px preview only",
    "inputSeconds": 1,
    "targetWarmWallClockMaxSeconds": 180,
    "hardStopWallClockSeconds": 300,
    "firstNeuralFrameStopSeconds": 60,
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    "deliverables": [
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      "silent intermediate WebM",
      "final timeline export with audio",
      "browser/GPU identification",
      "cold downloads and warm stage timings separated",
      "frame timestamps/retries/fallbacks",
      "human visual and listening notes"
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  "encoderExperiment": {
    "id": "AVATAR-ENCODER-2026-09-07",
    "status": "Executed and independently decoded on September 7, 2026",
    "guide": "encoder-trial/README.md",
    "result": "encoder-trial/browser-result.json",
    "verification": "encoder-trial/verification.json",
    "manifest": "encoder-trial/manifest.json",
    "output": "encoder-trial/three-cards-eight-frames.webm",
    "sourceCardSequence": "AAABBBBC",
    "encodedFrames": 8,
    "durationSeconds": 1,
    "audioTrackCount": 0,
    "neuralInference": false,
    "boundary": "This experiment verifies media selection, padding, truncation and packaging only. It does not establish generated portrait quality, phoneme alignment, final timeline audio export or neural speed.",
    "bundle": "encoder-reproduction.zip"
  }
}