Problems with exporting MP3 in Flatpak build

I used Shotcut (V20.11.28) the first time. I’m working with Linux Mint 19.
After cutting an mp4-Video I exported it as mp3 but got an error message:

plugin_mgr_get_object_file_plugins: error opening shared object file ‘/app/lib/ladspa/’: /app/lib/ladspa/ Ungültiger ELF-Header
[mp3 @ 0x7fe410000f40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[mp3 @ 0x7fe410000f40] Invalid audio stream. Exactly one MP3 audio stream is required.
[consumer avformat] Could not write header ‘/home/juergen/Videos/akasha.mp3’
[aac @ 0x7fe410002bc0] Qavg: -nan
[AVIOContext @ 0x7fe410019740] Statistics: 0 seeks, 0 writeouts
Failed with exit code 1

What can I do?

/app/... tells me you are using the Flatpak.

I tested this in Flatpak, and it is not built with support for MP3 via LAME. We can ask @pete to add it to the flatpak build for the new version 21.01 due in a day or two. In the meantime, you can use another export preset; I verified all the other audio ones should work.

Thank you for answer, but what does it mean to me?
Have I to install another version of Shotcut and where can I get it?
How do I know wether its flatpak or not?

I added LAME support to the flatpak. Just wait for the update (you can run “flatpak update” on the command line to check).

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