https://bugs.kde.org/show_bug.cgi?id=357693
Bug ID: 357693
Summary: Preview scans files opened for read/write resulting in
an endless scan, locking up CPU/Desktop
Product: dolphin
Version: 15.12.0
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: tuxfus...@gmail.com
A video file being created on the hard disk while Dolphin-Preview active is
being scanned for a thumbnail, every second although the creation is a minute
or hour long process resulting in thousands of thumbnail scans on one file. The
used up CPU and IO resources for scanning, extend the actual creation length of
the file as less resources are available, resulting in even more thumbnail
scans, as the overall process takes longer.
Reproducible: Always
Steps to Reproduce:
1. create a huge video file, for instance recode video a to video b. Let
resulting file be a modern hd file and let it have 5 to 10 gigabytes of data (
maybe smaller files also effected)
2. Have dolphin open, showing that folder. Preview Enabled.
3. As video b is constantly "growing" as it is being generated, dolphin or
better the thumbnail.so re-scans the file every second, resulting in huge CPU
usage.
4. Let the recode continue as long as it takes( this can be hours, depending),
dolphin will try to generate new thumbnails for hours, in bad situations.
Actual Results:
high cpu usage, desktop lock up/not reacting for seconds , every few seconds
Expected Results:
nothing, until read/write operation finished on the file
installed thumbnail software version:
local/ffmpegthumbs 15.12.0-1
FFmpeg-based thumbnail creator for video files
local/ffmpegthumbs-git r91.c06602f-1
FFmpeg-based thumbnail creator for video files
local/kdegraphics-thumbnailers 15.12.0-1
Thumbnailers for various graphics file formats
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