I've been using Avidemux 2.6 to trim video to extract a few seconds of useful video from a long clip. It works great and doesn't re-compress the original video so I don't loose quality.

However, I now have a Sony AX100 that shoots 4K and Avidemux won't let me trim the video. Sometimes the video works but the audio gets distorted.

If someone has had success with Avidemux and 4K, what settings are you using?
Is there an alternative to Avidemux which is just as simple to use and doesn't re-compress the original?

thanks,