version 21.04.3: consistent crash when loading video with unknown video settings

[Stub]

Hello,

Start KDenLive and add a video cliip to the project. If there is no profile yet for this video, a pop up dialog appears "No profile found for your clip" (picture attached).

Then click on "> Continue" and KDenLive crashes. However, the new profile seems to have been created, because KDenLive smoothly proceeds when repeating the above.

I believe this is a serious bug!

OS is Fedora 34, and details from the 'About' dialog:

Using:
MLT version 6.26.1
FFmpeg libraries

KDE Frameworks 5.85.0
Qt 5.15.2 (built against 5.15.2)
The xcb windowing system


Regards,
-Rob
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