After I installed this on Mint 21.1 my settings from the earlier version were still there.
When I tried to open a TV channel, Kaffieine seemed get some audio before crashing.

The errors reported from running it from a terminal are:

[00007f532c004e90] glconv_vaapi_x11 gl error: vaDeriveImage: operation failed
[00007f533000e8a0] main video output error: video output creation failed
[00007f533c034990] main decoder error: failed to create video output