Is this a legit source to obtain a Silicone Version of the Avidemux App?

To me, that doesn't look legit. You could check the DMG on the site of VirusTotal (free) Do you know LosslessCut (free)?

Gemini says yes. Just give it a try.

Shotcut is open source and has an ARM version: https://www.shotcut.org/

If after installation you get a message that the app is broken, it is because it is not notorized by Apple. With notorization in place, it might be legit.

For your specific need — cut/join without re-encoding — the tool you actually want is LosslessCut (someone mentioned it above). Native Apple Silicon, still maintained, free, and it does exactly the stream-copy trim/join Avidemux does, no quality loss. For that workflow it's honestly a better fit than Avidemux, so I'd jump straight to it instead of chasing an unofficial build. One caution on the Shotcut suggestion: great editor, but for simple cuts it re-encodes on export by default, so you'd lose the "no recode" benefit that's the whole reason you use Avidemux. Different tool for a different job. On the third-party site: for a GPL app, an "updated" binary from someone with no public source repo is exactly the thing to be wary of — they legally could publish the source so people can build and verify it, and not doing so is a flag. If you ever really needed to, VirusTotal plus checking it's Apple-notarized (like others said) is the minimum, but for cut/join you don't need to take that risk at all. And FWIW the old Intel Avidemux still runs under Rosetta 2 on Apple Silicon today, so you've got a working bridge while you switch over — no rush to grab a sketchy build.

What about shutter encoder?

i'd treat that kind of build as untrusted unless you can trace it back to the original maintainer or a very clear fork with source, releases, and reproducible-ish notes. before running it, check the signature first. Terminal can tell you a lot with spctl -a -vv /path/to/app.app and codesign -dv --verbose=4 /path/to/app.app. if it is unsigned, not notarized, or signed by a random name with no public repo/history, i would not use it for media files you care about.

Yeah I'm worried about this too. Avidemux is so light and powerful... I use it all the time to cut up video, then output without re encoding... also use it to quickly change containers, or change the audio. I hope somebody makes a silicon version before it's too late.

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