Video Timeline Analyzer

1. Drop a video file here, or click browse files.
2. Wait for metadata to load. Analysis starts when the video has a usable duration and dimensions.
3. Change Sample interval (ms), Scene change sensitivity (0-100), or another setting when needed.
4. Review the event panels. Click a row to move the player to that event's start time.
5. Click Export JSON report or Export CSV report to download the findings.

What the analysis settings control

The eight settings control sampling, detection thresholds, and minimum interval lengths. Sample interval (ms) accepts 50-5000, with 500 as the default. Scene change sensitivity (0-100) accepts 1-100, with 35 as the default. A lower sample interval gives the analyzer more points to inspect.

• Black frame luminance (0-255) defaults to 16. Black frame min duration (ms) defaults to 200.
• Near-duplicate sensitivity (0-100) defaults to 5. Duplicate min duration (ms) defaults to 500.
• Silence threshold (dBFS) defaults to -50. Silence min duration (ms) defaults to 300.

Silence threshold (dBFS): -50
Silence min duration (ms): 300

At or below -50 dBFS for 300 ms or longer: reported
At or below -50 dBFS for under 300 ms: ignored

How scene changes, black frames, and silence are detected

Scene changes compare consecutive sampled frames with a 64-bit grayscale difference hash. Each row shows Hamming distance, confidence, a timestamp, and a thumbnail. Black or near-black intervals use average sampled luminance, so their boundaries are estimates based on sampled frames.

Duplicate runs use the same checksum from downsampled, quantized grayscale samples. Near-duplicate runs use perceptual-hash distance, so similar-looking frames can match without a pixel-identical checksum. Both appear in the Duplicate / near-duplicate intervals panel.

Silence is measured in short RMS audio windows in dBFS. Silent rows show timestamps and peak level values. They do not include thumbnails.

When the analyzer misses a moment

Video Timeline Analyzer evaluates sampled frames. A cut or black flash shorter than Sample interval (ms) can fall between samples. Lowering that setting gives the analyzer more frames to inspect and increases the sampling work.

The browser decodes video for frame analysis and audio for silence analysis. A file without decodable audio shows "No decodable audio stream was found in this file." Invalid metadata or a decoding failure produces an analysis error. The source is never trimmed, re-encoded, or changed.

Where this comes up

• A video editor checks for black leaders, tails, or silent gaps before opening the footage in an editing project.
• A reviewer compares a long recording with its edit and uses scene timestamps and thumbnails to locate cuts.
• An archivist checks repeated still frames and exports a CSV report for a production log.

When to use Video Analyze Tools

Use Video Analyze Tools for other ways to measure a video file. Choose Video Timeline Analyzer when you need timestamped timeline events with JSON or CSV export.

Frequently asked questions