Audacious - OLD, PLEASE USE GITHUB DISCUSSIONS/ISSUES

Please provide some example files.

Here are the files.

Your files themselves have gaps at the end. Take a look at the FLAC (top) vs. the Opus (bottom) in Audacity:

There is nothing Audacious can do about this; the problem is on the encoding side, not the decoding side.

foobar2000 plays the Opus files just fine:

Feel free to look over the foobar2000 source code, see what it's doing differently, and submit a patch.