There's an app on F-Droid simply called Video Transcoder that should be able to do this for you. You can trim clips, change resolution/bitrate, change file formats/containers, and other simple things like that.
this post was submitted on 16 Sep 2023
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F-Droid
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F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Exactly what I was looking for. Thanks!
I just use ffmpeg
On Android?
Yes, via termux.
this is the way