Pokud máte AMD grafiku tak zde je návod:
https://answers.microsoft.com/en-us/windows/forum/ windows_7-pictures/all-video-sources-have-a-red-li ne-down-the-middle/4214e573-ef22-443d-9064-4bec3e1 f126a?auth=1If you have a catalyst video driver -> deaktivate the "demo mode"
- launch ATI Catalyst Control Center (Advanced)
- select Graphics -> Avivo Video
- Select Tab "all settings" and scroll down to bottom
- deaktivate Video Demo Mode
https://community.amd.com/thread/192895