https://bugs.kde.org/show_bug.cgi?id=418346
Bug ID: 418346
Summary: Screen capture not working on windows
Product: kdenlive
Version: 19.12.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: User Interface
Assignee: j...@kdenlive.org
Reporter: cc.capr...@gmail.com
Target Milestone: ---
SUMMARY
Screen capture is not working on Windows 10. Does not capture any audio. Tested
on 2 machines with fresh installs of latest release (19.12.2).
STEPS TO REPRODUCE
1. Install KdenLive and open
2. View > Screen Recorder
3. Click Record
OBSERVED RESULT
Nothing happens
EXPECTED RESULT
File created and imported into Project Bin
SOFTWARE/OS VERSIONS
Windows: 10
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
I've had a look at the code
[https://cgit.kde.org/kdenlive.git/tree/src/monitor/recmanager.cpp] (starting
L238). It seems that the arguments to ffmpeg ignore any settings in the
KdenLive GUI. A previous Qt app has also implemented ffmpeg capturing as
detailed here:
https://forum.qt.io/topic/46199/solved-screen-audio-recording-with-ffmpeg-using-qprocess
The arguments to ffmpeg seem different. However, I cannot access the process to
determine the actual arguments sent to ffmpeg [my own limitations]. Th
arguments that work for me have the structure:
ffmpeg -thread_queue_size 512 -f gdigrab -framerate 10 -i desktop -f dshow -i
audio="Microphone (Plantronics Wireless Audio)" -ac 1 -ar 44100 -vcodec libx264
-preset ultrafast -threads 2 -acodec libmp3lame out.mp4
which seems different to that generated in the code - especially the audio,
which needs its own "-i" argument.
A useful GUI option could optionally show the arguments sent to ffmpeg. This
would allow debugging and for users to see the actual ffmpeg settings used for
the capture.
The suggestion inteh other Qt app and forum discussion to use the virtual
screen and audio recorder:
https://github.com/rdp/screen-capture-recorder-to-video-windows-free
could make for a cross-platform solution.
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