SUMMARY The VA-API decoder cannot be set (enabled) in newer Kaffeine versions. The corresponding argument "--avcodec-hw=vaapi" shows no effect. This problem seems to affects most newer Kaffeine versions. So long VDPAU is working properly this is not a drawback. Unfortunately VDPAU seems to be on more recent Radeon (r600) MESA driver releases often broken. The solution or workaround is to switch to the VA-API. This works perfectly in VLC were in the settings the VA-API video decoder can be selected. After this, H264 videos can be played error free. STEPS TO REPRODUCE (r600 based Radeon GPU system needed!) 1. Install Kubuntu 18.04 LTS 2. Install a current Kaffeine version 3. Update system, also to newer MESA versions OBSERVED RESULT H264 video files are displayed corrupted in Kaffeine when a driver with broken VDPAU is used. A switch in Kaffeine to the working VA-API does not work, the corresponding VLClib argument shows no effect. EXPECTED RESULT The "--avcodec-hw=vaapi" argument should be active and working. However, it does NOT work. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Kubuntu 18.04 (available in About System) KDE Plasma Version: 5.12.9 KDE Frameworks Version: 5.44.0 Qt Version: 5.9.5 ADDITIONAL INFORMATION