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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.
That forced the RPi into 1080p mode and now my QT app is displaying correctly at 1920x1080.
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