media-sound/moc is possibile use media-libs/flac for playing flac files and support for wave, aiff, au and some more similar format is provide by libsndfile, Im add patch for ebuil that add support for it. It works fine for my. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Created attachment 54136 [details, diff] change moc 2.2.0 ebuild for support flac,wav,ua.... files
fixed in cvs, thanks for reporting