Updated October 2026
Replace audio puts a cleaned sound into an MP4 or MOV and copies the picture as it is. The picture is not re-encoded, so its quality is kept. The new sound is cut to the picture length if it is longer.
Tunedzy reads the video, copies the picture, and writes the new sound beside it. The FFmpeg tool that does the work runs as a separate program under the LGPL licence.
A shorter soundtrack leaves silence at the end of the video. A file without a picture stream is refused. Other formats may need converting first.
Play the new file from the start, the end and any cut. The replace audio guide has the steps.
Replace the sound in an MP4 or MOV with a cleaned version, and keep the picture as it was.
No, the picture is copied, not re-encoded.
Yes, for MP4 and MOV files, in the Windows app.
The video ends with silence after the sound stops.
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