Dominik Schmidt created TIKA-4776:
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Summary: Apple maker note tags written as LONG8 are dropped
Key: TIKA-4776
URL: https://issues.apache.org/jira/browse/TIKA-4776
Project: Tika
Issue Type: Improvement
Reporter: Dominik Schmidt
Apple maker notes in HEIC/JPEG images store several tags as LONG8 (TIFF
format code 16), e.g. the Live Photo video index (tag 0x0017). Example:
for a Live Photo still taken with an iPhone 15 Pro on iOS 18.5, tag
0x0017 is written with format code 16 and value 5283876.
The bundled metadata-extractor (2.20.0) only decodes the classic TIFF
format codes 1-12 and drops such tags, so Tika never emits
"img:Live Photo ID" even though metadata-extractor's
AppleMakernoteDirectory defines the tag name. Only the content
identifier ("img:Content Identifier", stored as a plain string) comes
through today.
This matters for pairing Apple Live Photos: the still image and the
QuickTime video share a content identifier (the video side is covered
by TIKA-2861), and the Live Photo video index is the image-side marker
that reliably identifies a still as part of a Live Photo (whereas just "Content
Identifier" seems to be a bit weak).
This is fixed upstream in metadata-extractor:
https://github.com/drewnoakes/metadata-extractor/issues/738
https://github.com/drewnoakes/metadata-extractor/pull/739
Verified end-to-end with a patched metadata-extractor build: Tika then
emits both "img:Content Identifier" and "img:Live Photo ID" for a real
Live Photo HEIC, with no Tika code change required.
Once a metadata-extractor release containing the fix is available, the
dependency (metadata.extractor.version in tika-parent) needs a bump. It would
be great to add a test then to make sure it doesn't break again.
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