In macOS, QuickTime sends video playback to the Quartz Extreme (OpenGL) Compositor. Decoding video and audio, then sending the decoded stream to the graphics or audio subsystem for playback. Command-line utilities afconvert (to convert audio formats), avconvert (to convert video formats) and qtmodernizer (to automatically convert older formats to H.264/AAC) are provided with macOS for power users.
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