Problems with exporting MP3 in Flatpak build

[DaddyJ]

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/ladspa-rubberband.cat’: /app/lib/ladspa/ladspa-rubberband.cat: 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?

[Hudson555x]

Export failed - Find solutions

Your export failed for one or more reasons. There is always a reason why it failed. Below are the posts by others describing their faults and solutions. This tutorial is not a definite tutorial as you may have a unique situation not described in here. Time Code After failure to export it may display a time code, make a note of the time displayed and look on your timeline to see what’s there that could be causing the problem. It could be a clip, audio or video file, transition. [firefox_20…

[shotcut]

@DaddyJ

plugin_mgr_get_object_file_plugins: error opening shared object file ‘/app/lib/ladspa/ladspa-

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

@DaddyJ

[mp3 @ 0x7fe410000f40] Invalid audio stream. Exactly one MP3 audio stream is required.

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.

[DaddyJ]

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?

[pete]

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