https://bugs.kde.org/show_bug.cgi?id=525902
Bug ID: 525902
Summary: TagLibExtractor returns wrong/missing audio properties
when reused across a bulk scan (Duration missing,
Channels wrong)
Classification: Frameworks and Libraries
Product: frameworks-kfilemetadata
Version First 6.30.0
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 196324
--> https://bugs.kde.org/attachment.cgi?id=196324&action=edit
Elisa Bug Report
Component: kfilemetadata (TagLibExtractor)
Version: kf6-kfilemetadata 6.30.0, taglib 2.3
Platform: Fedora 44 aarch64 (Asahi Remix), Plasma 6, Qt 6.11.2
Problem:
Running Elisa's library scan over a few thousand FLAC files, a lot of them come
back with no Duration/BitRate/SampleRate at all. One file even got a flat-out
wrong value: Sweetbox - Adagio - 1 - Liberty.flac was reported as 4 channels,
but it's plain stereo (confirmed with ffprobe: channels=2).
Running kfilemetadata_dump6 on the exact same file by itself gives correct,
complete results every time. So it's not the file, and it's not a general
TagLib parsing bug - it only shows up when the same extractor keeps getting
reused across many files in one scan.
I checked thread IDs in the debug log and the failures happen even on a single
thread, back to back, so it's not a race between threads either. Looks more
like leftover state from one file's parse bleeding into the next one.
To reproduce:
Point Elisa at a large FLAC library
Run with QT_LOGGING_RULES="org.kde.elisa*=true" and watch the per-file
extraction output
Compare against kfilemetadata_dump6 <file> run standalone on a file that came
back incomplete/wrong in the scan
Expected: same correct output either way.
Actual: bulk scan drops or corrupts properties for a large chunk of the
library; standalone extraction is always correct.
End result on the Elisa side: any file missing Duration fails isValid() and
just silently disappears from the library view, no error shown to the user.
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