Personally? I use MP4, either with AAC (which is pretty broadly supported these days) or ALAC (Apple Lossless), but this is because I mostly only use Apple devices and those formats have broad support there. ALAC is the one which is less portable (although it is an open format, so support is growing); your other options for lossless audio are WAV (typically on Windows) or FLAC (typically on Linux), neither of which really have desirable metadata properties IMO. But IDK, don’t take my recommendations too seriously here; there aren’t any perfect solutions.
I’m happy to help talk you through some RDF concepts and point you towards relevant XMP stuff!! I haven’t worked too much with XMP in particular myself, but I have a lot of background knowledge in metadata more generally, and it’s a part of the ecosystem I wouldn’t mind being a bit more familiar with.
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Personally? I use MP4, either with AAC (which is pretty broadly supported these days) or ALAC (Apple Lossless), but this is because I mostly only use Apple devices and those formats have broad support there. ALAC is the one which is less portable (although it is an open format, so support is growing); your other options for lossless audio are WAV (typically on Windows) or FLAC (typically on Linux), neither of which really have desirable metadata properties IMO. But IDK, don’t take my recommendations too seriously here; there aren’t any perfect solutions.
I’m happy to help talk you through some RDF concepts and point you towards relevant XMP stuff!! I haven’t worked too much with XMP in particular myself, but I have a lot of background knowledge in metadata more generally, and it’s a part of the ecosystem I wouldn’t mind being a bit more familiar with.