https://bugs.kde.org/show_bug.cgi?id=455357
Bug ID: 455357
Summary: X11 screen-capture fails on displays other than :0.0
Product: kdenlive
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: breaksl...@gmail.com
Target Milestone: ---
SUMMARY
Cannot capture/record screen on X11 servers with DISPLAY != :0.0
STEPS TO REPRODUCE
1. Start an X server with a display other than :0.0
2. Run kdenlive
3. Attempt to record the X11 display (screen capture)
OBSERVED RESULT
ffmpeg subprocess fails immediately with a "cannot open display" error.
EXPECTED RESULT
kdenlive begins capturing
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian
The ffmpeg command line from the kdenlive log:
Invalid button configuration: == STARTING X11 CAPTURE: ("-f", "x11grab",
"-s", "1280x720", "-r", "15", "-i", ":0.0+0.0", "-crf", "25", "-vcodec",
"libx264", "-preset", "veryfast", "-threads", "0", "-i", ":1.0")
As above, the -i option should specify both the X11 display (here :0.0) and the
x/y offset (+0.0). The display ID appears to be hard-coded in the source for
kdenlive. It would be better to either allow the user to manually configure the
display value, query the X11 server for the current display value, or respect
the value of the DISPLAY environment variable. Hard-coding the display prevents
capture on, eg, DISPLAY=:1.0
The offending line of code appears to be line 269 of monitor/recmanager.cpp on
the master branch.
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