echo $XDG_SESSION_TYPE
x11 <- not wayland yet

# remove the settings dir
rm -r ~/.ssr

# start it from a non-root terminal to get more details:
/usr/bin/simplescreenrecorder
[libmp3lame @ 0x556275c64000] Specified channel layout '2 channels' is not supported by the libmp3lame encoder
[BaseEncoder::Init] Error: Can't open codec!
[libmp3lame @ 0x556275c64000] Supported channel layouts:
[libmp3lame @ 0x556275c64000]   mono
[libmp3lame @ 0x556275c64000]   stereo
[BaseEncoder::~BaseEncoder] Stopping encoder thread ...
[BaseEncoder::EncoderThread] Encoder thread stopped.
[PageRecord::StartOutput] Error: Something went wrong during initialization.

how to fix it: select Vorbis as audio codec (neither mp3 nor aac worked)

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