https://bugs.kde.org/show_bug.cgi?id=481727
Bug ID: 481727
Summary: Recording H.264 of a rectangular region fails 75% of
the time with "not divisible by 2" error
Classification: Applications
Product: Spectacle
Version: 24.01.95
Platform: Arch Linux
OS: Linux
Status: REPORTED
Keywords: qt6
Severity: normal
Priority: NOR
Component: General
Assignee: noaha...@gmail.com
Reporter: adam.m.fontenot+...@gmail.com
CC: k...@david-redondo.de
Target Milestone: ---
SUMMARY
At first, as originally reported in Bug 481390, I thought H.264 recording
always fails. Turns out, I was just unlucky and it failed the first half dozen
times I tested it.
I didn't realize debugging information was provided when you run Spectacle in
the terminal, but I did so and immediately found the issue:
[libx264 @ 0x75f4302e9400] width not divisible by 2 (573x365)
kpipewire_record_logging: Could not open codec Generic error in an external
library
kpipewire_record_logging: No encoder could be created
STEPS TO REPRODUCE
1. Select a rectangular region of the screen for recording, with H.264 selected
as your codec. Make sure that one or both of the dimensions is not divisible by
two (e.g. 573x365 in my example).
2. Try to start recording video.
OBSERVED RESULT
Nothing is ever recorded or output, Spectacle minimizes itself to the taskbar
(red recording icon), but clicking on this icon does nothing. Spectacle has to
be killed from the task manager or terminal.
EXPECTED RESULT
Spectacle should prevent selecting unacceptable rectangular regions for the
current video codec.
**Moreover**, Spectacle should respond to errors from Pipewire in a way that is
(a) visible to the user, and (b) does not make Spectacle unusable until it is
killed and restarted.
My guess is that this sort-of affects VP9 as well, in that this is why the
recording is usually one pixel *wider* than expected and includes the dashed
rectangular outline that shows the recording region. This is in part what I
reported in Bug 481391, although there are other issues here too.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0
Kernel Version: 6.7.4-arch1-1 (64-bit)
Graphics Platform: Wayland
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