Audio Sync for Recorder Sound and Camera Video

A tool for shoots where sound is recorded separately: the camera films the clips, a recorder or a lavalier captures the voice. Load everything at once — each clip finds its own recording and its place in it, and the clock drift between the two devices is evened out along the whole take. Only the sound track changes; the picture stays as it was shot.

How to sync recorder audio with video

4 steps
1
Load the clips and the recordings

All the files of the shoot at once: camera video and recorder audio.

2
Wait for the match

Each clip gets a mark: sound found, check it, or not found.

3
Check by ear

Play the clip — it plays with the recorder sound. Shift the recording if needed.

4
Save the clip with the recorder sound

One clip, the sound as a separate file, or all clips at once.

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Put clean sound under every clip of the shoot day

Drop camera clips and recorder audio here
All the files of the shoot at once — pairs are matched by sound
MP4, WEBM, MOV, MP3, WAV, M4A, OGG, FLAC, AAC, M4B, WMA, AIFF, OPUS, CAF, MKV, AVI, WMV, FLV, M4V, 3GP, TS, MTS, M2TS, VOB, MPG, MPEG, OGV ·
  • The camera has to record its own sound, however rough: it is what locates the clip inside the recorder audio.
  • The recorder can keep running between takes — each clip finds its own stretch.
  • On long takes the camera and recorder clocks drift apart — the recording is re-timed along the whole take.
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Features

The whole shoot day at once
Drop every clip and every recording: a file with a picture is a clip, a file without one is a recording. Each clip finds its own recording and its own stretch of it.
Clock drift correction
A camera and a recorder run at slightly different speeds: 50 parts per million is 180 ms an hour. The drift is measured in 10–20 second windows along the take, and the recording is re-timed to fit.
The picture is not re-encoded
In MP4 and MOV files only the sound track is replaced: the frames stay the same bytes, so video quality is untouched and a long clip is built quickly.
Check by eye and by ear
The clip plays with the recorder sound, and the envelopes of both tracks lie on one timeline. Listen to the camera, the recorder or both, and shift the recording in 10 ms steps.
A refusal instead of a guess
When no recording contains the sound of a clip, the tool says so rather than placing a track at random. An uncertain match is flagged and left out of the batch.
Sound for an editing program
Instead of the video you can save a 24-bit WAV exactly as long as the clip: put it on a track from zero and it lines up with the picture.

Questions about syncing audio and video

What does a clip need to find its recording?

The camera has to record its own sound — quiet and echoey is fine: that is what locates the clip in the recorder audio. Ten seconds of shared sound are enough; on a shorter take the match is flagged as uncertain and is worth checking by ear.

Why does the sound slide away from the picture on a long take when the start is right?

A camera and a recorder each have their own quartz clock, and their seconds differ slightly in length. Over a minute nobody notices; over an hour it adds up to several frames. The tool measures the shift at the start, the middle and the end of the take and changes the speed of the recording by those fractions of a percent, so the sound fits along the whole length.

The recorder ran without stopping and there are twenty clips. Does the recording have to be cut?

No. Load the whole recording and all the clips: only the stretch that belongs to each clip is taken from it. With several recordings, a clip picks the one that contains its sound.

What happens to a clip that has no recording?

It is marked "not found" and stays as it is. That happens when the recorder was paused at that moment: sound from somewhere else is never placed under a clip.

How does saving MKV and AVI differ from MP4 and MOV?

In MP4 and MOV the new track is inserted into the original file, and its size hardly matters. Other containers are built by copying the streams: the picture is not re-encoded either, but a very large file cannot be built that way — save the WAV for it and place it in an editing program.

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Who is this tool for?
🎬 Video Creators
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