I'm looking for an Android application that can concatenate two videos without re-encoding the videos. The two videos have the exact same format and encoding. On Linux, Windows or macOS, I would use ffmpeg. Any license or price is fine. I tried YouCut but I suspect it may perform some re-encoding.
You can run ffmpeg also on Android by utilizing environment like Termux. Install it with a command like:
pkg install -y ffmpeg
and grant it access to files.
Rooting may or not be required depending on Android version and specific OS.