the previous commit read the duration from meta.json instead of spawning
ffprobe. correct for an indexed album and wrong everywhere else: /stream
serves any home-relative path and never required an index, so a library that
has not been indexed got no header at all. alpha is exactly that case — its
music cache is empty — which is how this was caught rather than shipped.
"always present" replaced with "present if indexed" is the same regression as
removing the header, one layer down.
so both, in order: meta.json when it can answer, ffprobe when it cannot, each
cached. verified on an indexed album (247 from meta, 0.3ms warm) and on the
same file with its index deleted (7.03 from ffprobe, 83ms cold, 0.1ms warm).
pastilhas
b430a702b4