The word-level highlight system stayed locked to the active words during fast speech, with no visible drift across the timeline.
What was measured
Timing precision
How accurately the tool syncs captions at the word level so highlights land on the right word at the right moment.
transformation
What was given, what came back
Test input: AI demos chatbot short · video
Input — what we sent
AI demos chatbot short
Fast-speaking single-speaker clip used to stress whether visual word-by-word highlighting stays synchronized with rapid audio.
Why this input is hard
- · high-speed audio-visual sync
- · caption timing under rapid speech
- · sync drift detection
- · highlight lag during fast delivery
Output — unretouched
No output artifact
The verdict rests on the tester's written observation alone — no file was captured for this cell.
Also checked on this input — same tool, 1 other criterion
Provenance
- Observation
- a2b85065-c712-48d4-abc4-99a89fb50d22
- Evidence run
- 476abcc6-bd47-4f8c-8d81-d7ff6f5293a2
- Study
- Generate Animated Captions with Effects for Videos
- Research task
- 86ba42c3z
- Tested at
- not recorded
- Source
- first-party
- Evidence state
- verified
- Proof shown
- input only
- Cost / latency
- not captured
- Repeat run
- not captured
- Tester
- not captured
The last three rows are honest blanks, not placeholders — our capture has no field for them yet.
Query this
get_evidence({
tool: "autocaption-io"
})MCP · mcp.aidemos.com/api/mcp
Free with attribution.
Same input, same check — 3 other tools
measured on Timing precision
Opus Clip⚠ StruggledAt 1.15x playback speed, word highlighting falls behind fast speech enough to show visible text lag and minor frame drops, so rapid captions are not perfectly locked to the audio.Vidyo.ai◐ MixedAt about 1.15x spoken pace, word highlighting stayed acceptably synchronized, but it still showed fractional-frame lag during the fastest phonetic bursts.Vizard.ai✓ WorkedWord-level caption highlighting stayed locked to rapid speech, with the report saying it maintained high accuracy and showed no sync drift during fast syllables.
This evidence is published in
Real inputs and real outputs, no retouching · every cell queryable via API & MCP · aidemos.com