Audio analysis API for video automation

Turn uploaded audio into beat-synced timing data.

BeatSync API analyzes short audio files and returns BPM, beat timestamps, downbeats, and cut points that are ready for short-form video pipelines.

Try on RapidAPI Read the docs

{
  "duration": 34.12,
  "bpm": 99.4,
  "beats": [
    {
      "time": 0.61
    },
    {
      "time": 1.22
    }
  ],
  "downbeats": [
    {
      "time": 0.61,
      "bar": 1
    }
  ],
  "cut_points": [
    {
      "time": 4.84,
      "score": 0.88,
      "type": "strong"
    }
  ],
  "cut_points_by_style": {},
  "meta": {
    "task_id": "atsk_...",
    "request_id": "req_...",
    "processing_ms": 2841,
    "audio_duration": 34.12,
    "schema_version": "1.0",
    "engine_version": "beat-this-final0"
  }
}

What it returns

Rhythm features built for timeline decisions.

BPM and duration

Use tempo and analyzed duration to classify tracks, estimate pacing, and select editing presets.

Beat timestamps

Frame cuts, captions, transitions, and motion effects around timestamped beat positions.

Cut-ready timing data

Use the core scored cut points as practical edit hints instead of raw audio features only.

API shape

One endpoint. Upload in, JSON out.

Send audio through RapidAPI with multipart/form-data. Direct uploads are capped at 10 MiB and 120 seconds, then temporarily stored for analysis.

curl --request POST \
  --url https://beatsyncapi.p.rapidapi.com/v1/analyze-sync \
  --header "X-RapidAPI-Key: $RAPIDAPI_KEY" \
  --header "X-RapidAPI-Host: beatsyncapi.p.rapidapi.com" \
  --form "file=@/path/to/clip.mp3;type=audio/mpeg"

Use cases

For teams automating rhythm-aware media.

Short-form video tools

Auto-align cuts, overlays, zooms, and transitions to music beats.

Template rendering systems

Turn uploaded audio into deterministic timing inputs for batch video generation.

Creative automation workflows

Precompute beat grids for scheduling, preview generation, and editing suggestions.