My System - Fedora 25 After upgrade to 5.4.0-1 from the standard fedora 25 repository, I no longer get previews of video files (any type). 1) Pressing the fullscreen button on the thumbnails give the fullscreen viewer with an error message. It works fine with photos. 2) All video formats play perfectly with every player installed on my system. 3) I have install QtAV and the qtav-player works perfectly with my videos. 4) Qt = 5.7.1, EXIV2 = 0.25 5) Component list shows "Media Player Support = no". All other components are yes or a version number.
Well, video support is a compilation option. Report this problem to Fedora maintainer as DOWNSTREAM problem. Note : you can use AppImage universal Linux bundle. Video support is enabled. The pre version 5.5.0 is available at this place : https://drive.google.com/drive/folders/0BzeiVr-byqt5Y0tIRWVWelRJenM Gilles Caulier
See also https://plus.google.com/u/0/+GillesCaulier/posts/L2Q2ke8h6Ze Where I explained why fedora cannot legally enable this feature
*** Bug 375357 has been marked as a duplicate of this bug. ***
Rex, You don't want to depend on ffmpeg with fedora (for obscur reasons...). No problem, use libav fork of ffmpeg. QtAv is compatible with both... https://libav.org/ Gilles Caulier