The missing, rebuild and Convert outdated jobs stopped after
MAX_THUMBNAIL_FILES (10,000) files and said "N more on the next run", but
nothing ever started that next run. The cap now bounds one batch. After
each batch the job plans again, leaving out every file it already worked
on, and continues until nothing is left, the job is cancelled, or a batch
makes no progress. That last case stops on files that fail every time
instead of looping over them.
Activity progress counts against the overall total, and the final line and
the legacy stream's complete frame report every batch. Admission, worker
threads, cancellation and the #316 rules are unchanged. The Thumbnail
maintenance dialog now counts all the work instead of saying "more on the
next run".
- Convert never removes a path that is the preview it just wrote. It
compares the device and inode, or the resolved and normcased paths when
the disk has no inode numbers. This covers x_thumb.JPG on a
case-insensitive disk.
- A JPEG XL encode failure re-runs encoder detection only when the
encoder's binary or module is gone. A "no encoder" result is checked
again on the settings read, on a jxl save, and after 60 s, so one slow
probe no longer turns JPEG XL off until a restart.
- The startup sweep now also removes temp files that carry this process's
PID but predate its start. Containers reuse PIDs.
- ffmpeg writes JPEG XL with -update 1, so a % in a file name is never an
image-sequence pattern, and reads videos as file:<path>. The clear and a
startup sweep remove temp files that interrupted writes left behind.
- Convert outdated converts each group of same-stem files once, from the
first source in the R2 order. An old preview that is already gone counts
as removed, and each file's bytes count once. A current preview is only
kept if it decodes.
- An encoder that fails makes the write detect encoders again once. Another
encoder is used if one is found; with none, the file is written as WebP
and the availability Appearance shows is refreshed.
- Changing the thumbnail format, quality or size while Convert outdated runs
returns 409 busy. If the format still changes underneath, the job stops
without removing anything.
- Legacy preview spellings are matched case-insensitively, so X_thumb.JPG
counts as outdated.
- History's cover uses the same lookup as Images. It serves .jxl only when
Accept lists image/jxl, and otherwise the original or the placeholder.
- A video whose thumbnail the browser cannot show keeps its own element
(Images) or its label (Library).
POST /jobs/thumbnails {mode: "convert"} starts "Convert outdated
thumbnails" under the thumbnail job's kind, guarded admission, worker
threads and cancel at a file boundary. For each file whose preview is
in another format, it writes the new preview from the source (atomic,
verified; a video with no decodable frame fails instead of getting the
placeholder), then removes that file's old-format previews in its
thumbnails folder. A failure keeps the old preview; orphan previews
and links are never touched. The final line reports converted, failed
and bytes before and after. The plan counts it with mode=convert; the
legacy gallery stream refuses to attach to a running conversion.
Vito Sansevero