Thumbnailing on iOS fails when syncing over itunes
When syncing multiple files over iTunes Thumbnailing fails with logs like : Warning: /Users/caro/Documents/Projects/VLCMediaLibraryKit/libmedialibrary/medialibrary/src/thumbnails/VmemThumbnailer.cpp:91 generate Failed to generate file:///private/var/mobile/Containers/Data/Application/91077B42-794E-4C6A-A308-E53663F3C0F3/Documents/Advanced%20Debugging%20Carola%20Nitz.mp4 thumbnail: Failed to seek ahead
and is never regenerated