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H.265 also known as HEVC (High-Efficiency Video Coding) - a video compression standard which uses more efficient video encoding tools than previous H.264.

Standard has been developed by ITU-T Video Coding Experts Group (VCEG) and MPEG group. H.265 was published as a standard in 2013. HEVC format supports frames with resolution up to 8K (UHDTV).

There are some new encoding tools in this standard, such as:

  • AIF filter
  • motion interpolation upt ⅛ pixel
  • adaptive prediction errors of coding (APEC)
  • adaptive quantization matrices (AQMS)
  • more intra prediction modes

and many others.

But the most important change is tree blocks structure (instead of simple macroblocks in H.264) with a maximum block size up to 64x64 pixels.

Comparison with H.264 standard shows bitrate decreasing up to 35%.