Published by PitchChanger · Updated · How these guides are made
How to use this workflow
Define where the dancers count one
Write down whether the entrance is the first audible beat, the first movement or the main phrase downbeat. These may differ. Retain a lead-in that gives the dancers time to count and identify the first intended movement by a visible landmark. A browser audio export does not preserve the video timeline or automatically synchronize movement.
Prepare and verify the file
Extract the local video’s first audio stream if it is the intended reference; the extractor produces MP3 and offers no stream selector. Import that file into your external video editor and align the first reference event. Check a later movement too: if the start aligns but later cues drift, investigate differing speeds or a variable-tempo source. Do not trim away the lead-in merely to make the file start with music.
Original worksheet: define where the dancers count one
For an invented steady quarter-note pulse of 120 BPM, one beat is 0.5 seconds. Eight lead-in beats occupy 4 seconds. If the first counted beat begins at video time 1.2 seconds, the downbeat after those eight intervals is at 5.2 seconds. Count intervals carefully: beats numbered 1 through 8 contain only seven intervals between the first and eighth onsets.
Swipe or scroll sideways to read all columns.
| Item | Value or check | Interpretation |
|---|---|---|
| Landmark | Calculated video time | Meaning |
| Lead-in beat 1 | 1.2 s | Start counting |
| Lead-in beat 8 | 4.7 s | Seven intervals later |
| Entrance downbeat | 5.2 s | Eight intervals after beat 1 |
Use the worksheet with the actual tool
The example is an authored procedure or calculation, not a measured recording or a claim of successful device testing. Replace proposed positions and observations with your own checked results. Keep the original and reopen the saved output before relying on it.
Common questions
Can I rely on the first beat alone?
No. Verify a second landmark near the end. A constant offset and accumulating drift require different corrections.