Passthru

[virtualandy61]

Is there any way to export a video with video or audio passthru ?

[Hudson555x]

No
https://shotcut.org/FAQ/#how-do-i-cut-or-trim-a-clip-without-encoding-or-transcoding-it

[virtualandy61]

It is not exactly the same.
However, it is a shame, because if I only edit the audio of a movie it is useless to recompress the video too, wasted time and quality.

[ejmillan]

If you only edit the audio and don’t want to modify the video, you can use avidemux to add or replace an audio track without re-encoding the video.

[Austin]

A way to replace audio using ffmpeg:

Only render audio

Can’t be done. A Shotcut export is always an encoding task, not a codec copy task. However, you’re familiar with ffmpeg, so there is an alternative. Bring the video into Shotcut. Edit your audio as you intended. Export the audio from Shotcut. (There are audio-only presets, or you can cook your own.) Then we can effectively swap audio tracks with ffmpeg: ffmpeg -i Original.mp4 -i AudioOnly.aac -map 0:V -map 1:a -codec copy AudioSwap.mp4