video decode error "Permission denied"
From the above error it seems some permission issue, do I need to add any additional permission on AppxManifest.xml currently I am using default manifest which is created by Qt creator.
I'm not a WinRT expert but I think you need additional permissions for the Videos directory.
Yes, that what I confused, how can grant the permission to access file? Does the third party library need some extra permission as ffmpeg lib is used to open video file.
within the package.appxmanifest under "functions" (not sure if its called so in the english Version) you can define the rights for the app. one of the rights is the videolibrary. maybe this is the right one.
I have added manually, but still no luck.
but no idea if this "uap:" is needed.
I'm sorry, I have only little experience on WinRT. Maybe the output is missleading. I would try to access a text file for debug in this folder directly from my application to make sure that this is really the reason.