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> A photo can contain coordinates in the EXIF tag but for audio there is no such thing as a far as I know.

And yet this isn't good enough - I often wish I had the orientation or sometimes the z-coordinate but it's not saved.

Apple's Voice Memos uses your current location as the default name for the voice note. As far as I know it's not geotagged in the same sense that a photo is, but for personal notes it seems good enough.

for audio/video, would you want a single lat/long per file, or a continuous stream with run-length encoding?

For me, a single lat/long would be sufficient because I would only make a short voice memo in each file. But I can certainly understand that it would not be sufficient for cases with long files when you move during the recording.