Hi, What version of Qt are you trying to build ? Which options did you pass to configure ? What was the configuration summary ?

Depending on your needs, QAudioOutput is rather a lightweight alternative but QMediaPlayer is indeed easier to setup and run. Glad you found out and thanks for sharing !

Realised buildroot hadn't copied over a config.txt to the boot partition of the SD card. Copied across a minimal config and set configured a few arguments as stated in this thread. hdmi_ignore_edid=0xa5000080 hdmi_group=1 hdmi_mode=16 That forced the RPi into 1080p mode and now my QT app is displaying correctly at 1920x1080.