QUALITY_HIGH and QUALITY_LOW refers to the highest or lowest available video quality supported by your device.
According to android docs quality level will be the highest/lowest available resolution(as per camera resolutions) which exactly means the preview sizes, bitrates, audio/video encoder, output format(e. G 3gp, mp4) and many more based on the HIGH/LOW quality your recorded file size and quality will be increase/decrease. Based on your requirements you can use any of the either.
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