I use Audacity 2.3.3 as packaged in Debian Bullseye.
When I import a call record from Linphone, which is an opus-encoded MKV container, Audacity plays the record correctly, but doesn’t let me split any parts of it. The menu field “Edit → Clip Boundaries → Split” is greyed out and remains like this as long as my selection is smaller than the entire track.
This behaviour doesn’t change by converting the MKV file to WAV with ffmpeg before opening it in Audacity. With an “original” WAV file that was never converted from any other format, splitting works fine.
What are the technical reasons for this behaviour? I am not happy editing compressed files, but I got them, so now I have to use them.
Thank you for your suggestions,