[dolphin] [Bug 495145] New: baloo_filemetadata_temp_extractor causes dolphin to freeze when large files are scanned for details

[Angelos Skembris]

https://bugs.kde.org/show_bug.cgi?id=495145

            Bug ID: 495145
           Summary: baloo_filemetadata_temp_extractor causes dolphin to
                    freeze when large files are scanned for details
    Classification: Applications
           Product: dolphin
           Version: 24.08.2
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: information
          Assignee: dolphin-bugs-null at kde.org
          Reporter: a.skembris at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY

When accessing a folder with large video files (>5 Gb at least), dolphin will
freeze for a few seconds. According to the system monitor output, this happens
while baloo_filemetadata_temp_extractor is parsing the files to extract details
that are usually shown in the "Information" side panel (e.g. dimensions,
duration, etc.) (System monitor shows large read rates from
baloo_filemetadata_temp_extractor). 

The effect is annoying on an SSD, but makes Dolphin practically unusable in the
case of HDDs (which I am using in this case, as the video files are quite
large, I have a lot of them and I don't particularly care about writing
speeds). 

Note that I have disabled file indexing and set the threshold for the option
"Show previews" to files below 100Mb) (although I think this refers to the icon
thumbnails, not the "Information" metada?)

As a workaround, I renamed the executable
/usr/bin/baloo_filemetadata_temp_extractor so that it stops parsing the files.
I don't get any metadata in the "Information" any more, but it beats not being
able to use Dolphin at all (for these folders, at least). 


STEPS TO REPRODUCE
1. Place large (>5 Gb) video files in a folder, probably multiple such files.
2. Open the folder using Dolphin
3. Click or hover over any of these files. 

OBSERVED RESULT

Dolphin freezes for a few seconds until it extracts the metadata from the
files.

EXPECTED RESULT

I would expect Dolphin to remain responsive or not to extract the details of
these files, as these files exceed the "Show previews" threshold I have set (I
am fine with not seeing the details for so large files since parsing to extract
metadata takes a while). 

SOFTWARE/OS VERSIONS

Operating System: openSUSE Tumbleweed 20240916
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.10.9-1-default (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 4600H with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor: AMD Radeon Graphics

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