https://bugs.kde.org/show_bug.cgi?id=474927

            Bug ID: 474927
           Summary: AppImage: FFmpeg binary should be found automatically
                    when path field is empty or invalid.
    Classification: Applications
           Product: krita
           Version: git master (please specify the git hash!)
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Animation
          Assignee: krita-bugs-n...@kde.org
          Reporter: emmetoneill....@gmail.com
  Target Milestone: ---

SUMMARY

Despite running in an AppImage with bundled FFmpeg, Krita fails to render
animations due to an empty or invalid FFmpeg path inside the "Render Animation"
dialog.


STEPS TO REPRODUCE
1.  Create a short animation.
2.  File > Render Animation
3.  Enable "Export as Video" section.
4.  Specify an empty or invalid FFmpeg path.
5.  Hit OK and continue.

OBSERVED RESULT

FFmpeg path is empty even though it should be bundled within the AppImage
itself.
As a result, rendering animation fails with an "Unknown Error". 

EXPECTED RESULTS

1. In the event of a empty/invalid/bad user-specified FFmpeg path, we should
probably have a solid fallback that checks various logical paths where FFmpeg
might be, depending on the platform. In the case of Linux AppImages, I think we
should always be able to fall back to the FFmpeg that's bundled inside the
AppImage's appdir ("$AppDir/usr/bin/ffmpeg").

2. Is it possible to improve the "Unknown Error" that we get in this
circumstance, because unknown errors are not very informative?


SOFTWARE/OS VERSIONS
AppImage built with Dmitry's docker environment.
Fedora Silverblue 38

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