This stands for 2-Channel Audio , or Stereo. This means the sound is optimized for headphones or standard TV speakers rather than a 5.1 surround sound home theater setup.
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This stands for High Efficiency Video Coding . It is the successor to the older AVC (x264) standard. The magic of HEVC is that it can compress video to about half the size of older formats without losing quality. This is why a 720p file can look great while taking up very little storage space. This stands for 2-Channel Audio , or Stereo