Use ffmpeg, -acodec copy -vcodec copy
this post was submitted on 15 Jan 2024
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This is the way if you want to ensure your video is 100% untouched.
Haven't tried it myself, but there's lossless-cut:
I believe avidemux will work for OP (with replacing audio), and it's what I normally use (usually only for cutting though), but lossless-cut does look way more featureful.
is that for only trimming?
No. It says right there on the github, it can do all sorts of stuff. It can replace audio tracks.
What do you mean by "attach an audio to an image"?
Depending what format of audio, you can embed the image into the metadata