WaveMix
When the background music does not fit the video
The cut is ninety seconds. The track you want is three and a half minutes. Or the other way round — the piece runs out while the video keeps going. Both are the same problem, and the two obvious fixes (loop it or stretch it) each leave a mark.
Why looping and stretching both give it away
| Fix | What it costs |
|---|---|
| Paste the track again to fill the gap | The loop point lands wherever the file happened to end. You hear the same phrase restart, usually mid-bar, and the ear catches the repeat immediately. |
| Time-stretch to length | Anything past a couple of percent changes the character of the track; push further and vocals start to sound artificial. Pitch shifts with it unless the tool compensates, and that compensation has its own artefacts. |
| Fade out early and call it done | Works when the music is only decoration. If it carries the edit, fading out mid-phrase reads as the video giving up. |
What to do instead: rearrange by section
A piece of music is already built from blocks — intro, verse, chorus, bridge, outro. You can drop a block, or play one twice, and the result still sounds like a piece of music, because you are working with the seams the composer already put there.
- Too long? Drop a verse, or one repeat of the chorus. The arc survives; the runtime comes down in whole bars.
- Too short? Play a section twice. Done on a bar boundary with a matched transition, a repeat is much harder to notice than a loop of the whole file — the music was written to come round again.
- Either way, the tempo never changes, so nothing about the character shifts.
Rule of thumb: change the number of sections, not the speed of the music. Listeners notice speed instantly and structure hardly at all.
Getting it into your edit
- 1. Drop the track in. Sections, tempo and bar lines get marked automatically.
- 2. Type the runtime of your cut. You get a few different arrangements back, each showing what it dropped or repeated.
- 3. Export. Take the audio as WAV — or export markers only (WAV markers or a CUE sheet) and drop them into DaVinci Resolve, Premiere, Audition or CapCut, so you can cut picture to the same points.
One setting to get right before exporting markers: set the frame rate to match your project. Pick the wrong one and every marker lands slightly off.
Two things people ask
Can I make the chorus land exactly on 0:47?
You can get very close, but rarely on a round second — the edit has to sit on a bar line to stay on the beat, and bar lines seldom fall on whole seconds. In practice, leaving a little slack in the picture edit is cheaper than forcing the number.
Does this change what I am allowed to do with a copyrighted track?
No. Changing the length does not change the licence. Whether you can use a piece commercially depends on the rights to that recording, not on how it was edited.
Try it
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