Opus audio files usually have the ".opus" extension, but ".oga" or ".ogg" are also valid extensions. The mime-type for ".ogg" or ".oga" is "audio/ogg". kfilemetadata relies on taglib to extract the metadata, but explicitly asked for vorbis (not opus!) extraction based on the mime-type[1], which erros in taglib [2] and therefore kfilemetadata. As a result application relying on it (e.g. Elisa) refuse to handle opus in ".ogg" and ".oga" files [3]. I'm not a C++ dev, but I got some kdesrc-build going and did a simple copy&paste job in taglibextractor.cpp [4], which at least fixed playback in Elisa. [1] https://invent.kde.org/frameworks/kfilemetadata/-/blob/master/src/extractors/taglibextractor.cpp#L661 [2] https://github.com/taglib/taglib/blob/master/taglib/ogg/vorbis/vorbisfile.cpp#L124 [3] https://bugs.kde.org/show_bug.cgi?id=443519 [4] https://pastebin.com/BgydkqpM Operating System: CachyOS Linux KDE Plasma Version: 6.1.4 KDE Frameworks Version: 6.5.0 Qt Version: 6.7.2 Kernel Version: 6.11.0-rc6-1-cachyos-rc (64-bit) Graphics Platform: Wayland Processors: 12 × 11th Gen Intel® Core™ i5-11400 @ 2.60GHz Memory: 31,2 GiB of RAM Graphics Processor: Mesa Intel® Arc
Sorry for the sloppy, original writeup. Here the missing context: SUMMARY kfilemetadata doesn't process the opus codec in ogg container files if the file extension isn't ".opus", but e.g. ".ogg" or ".oga". STEPS TO REPRODUCE 1. Create an opus encoded file in an ogg container (e.g. export as opus from Audacity) 2. Rename the file from "foo.opus" to "foo.ogg" 3. Try to play back the "foo.ogg" in e.g. Elisa EXPECTED RESULT Elisa should show up metadata (title, album, cover) and play back the audio. OBSERVED RESULT Elisa doesn't show any metadata and doesn't allow to start playback. ADDITIONAL INFORMATION Analysis see above. Essentially: kfilemetadata expects ".ogg" files to only contain the "vorbis" codec, but doesn't take into account that the "opus" codec is also valid. "foo.opus" files (no renaming to "foo.ogg") are handled fine (in Elisa). Interestingly ".opus" files show up as "audio/ogg" too, at least with "file --mime-type foo.opus". From what I see Elisa uses "QMimeDatabase" for ".opus" files, which must report something different(?), but this is above my paygrade now (only reading code, no clue about C++ and/or Qt).