While AVFoundation supports FLAC (since macOS 10.15), it is not enabled in QMediaPlayer by default for all container types.
qDebug() << QMediaPlayer::availableBackends();
Understanding QMediaPlayer Supported Formats in Qt 6 / PyQt6 qmediaplayer supported formats
If you have control over the Linux environment, you can install plugins to support almost anything.
Missing DirectShow filters for formats like MKV or FLAC. Fix: Install LAV Filters or use wmf backend instead of directshow (Qt 5.10+). Check backend: While AVFoundation supports FLAC (since macOS 10
QMediaPlayer player; auto mimeTypes = player.supportedMimeTypes(); foreach (const QMimeType &mime, mimeTypes) qDebug() << mime.name();
"video/mp4" "audio/mpeg" "video/x-ms-wmv" "audio/x-wav" Fix: Install LAV Filters or use wmf backend
qDebug() << QMediaPlayer::availableBackends(); // Expect "ffmpeg" if configured.
In the landscape of Qt development, multimedia handling is a cornerstone of many modern applications. Whether you are building a custom video player, an audio streaming utility, or a complex presentation tool, the QMediaPlayer class is often the engine of choice. However, one of the most persistent headaches for developers—both novice and experienced—is deciphering exactly which file formats QMediaPlayer supports.