Bug 461799

Summary:	No progress is shown for second face recognition process
Product:	[Applications] digikam	Reporter:	MarcP <iwannaberich>
Component:	Faces-Workflow	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	iwannaberich, metzpinguin
Priority:	NOR
Version First Reported In:	7.9.0
Target Milestone:	---
Platform:	Appimage
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	8.0.0
Sentry Crash Report:

Description MarcP 2022-11-14 01:23:22 UTC

SUMMARY
I noticed that if a second (or more) face recognition task is started when some other faces are being recognized, the second (and subsequent) tasks are not shown in the progress bar. However, it will continue in the background, although there's no visual feedback of the process completion.

STEPS TO REPRODUCE
1. Select a picture folder/album, right click, "Scan for Faces".
2. Observe how a progress bar is shown at the bottom right.
3. Select another picture folder/album, right click, "Scan for Faces".

OBSERVED RESULT
Nothing apparently happens. The second album is actually being scanned, but without any indicator of its progress.

EXPECTED RESULT
A second progress bar should appear showing the progress of that second task.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Kubuntu 22.04 LTS 
digiKam-7.9.0-20221030T175249-x86-64.appimage

Comment 1 Maik Qualmann 2022-11-14 06:46:49 UTC

This was changed in digiKam-8.0.0, it is no longer possible to start other processes and a message is displayed. The start of several face detection/recognition processes is not wanted due to the high memory consumption.

Maik

Comment 2 Maik Qualmann 2022-11-14 06:52:18 UTC

See also this: https://invent.kde.org/graphics/digikam/-/merge_requests/192

Maik

Comment 3 MarcP 2022-11-14 12:50:20 UTC

Wouldn't a better option be queueing the pictures to be scanned for faces, so they don't run in parallel but in series?