Advantages of H.265 (HEVC) | Disadvantages of H.265 (HEVC)

This page covers advantages and disadvantages of H.265 (HEVC) High Efficiency Video Coding. It mentions benefits or advantages of H.265 (HEVC) and drawbacks or disadvantages of H.265 (HEVC).

Introduction: H.265 is a video compression standard introduced in 2013. It is successor to H.264 standard. It is known as HEVC (High Efficiency Video Coding). H.265 video codec uses advanced techniques such as large block sizes, more efficient entropy coding and improved motion compensation. It is used for video conferencing, video streaming, video surveillance etc.

Following are the features of H.265 (HEVC).
• Supports high resolution video up to 8K resolution.
• Supports wide range of video formats such as 3D video, HDR video etc.
• Supports 10 bit color depth
• Supports 35 modes in intra prediction
• Supports 32 x 32, 16 x 16, 8 x 8, 4 x 4 integer DCT transform
• Supports CABAC entropy coding
• Supports 64 x 64 pixel macroblocks as compare to 16x16 supported by H.264
• Offers improved compression due to prediction motion between frames
• Supports in-loop filtering such as adaptive de-blocking filter, sample adaptive offset filter

Benefits or advantages of H.265 (HEVC)

Following are the benefits or advantages of H.265 (HEVC):
➨It offers high level of compression (~ 30 to 50 %) compare to H.264 and maintains good video quality.
➨It offers higher video resolutions and bit depths.
➨H.265 supports fewer bit rates compare to H.264 codec. Hence it is more efficient than H.264 codec.
➨It supports parallel processing which lead to faster video encoding/decoding times on devices running multiple cores.
➨It supports more flexibility in encoding settings which helps video creators to adjust encoding settings as per application requirements.
➨It uses 10 bit color depth and hence it supports more color shades and wide range of colors compare to H.264 8 bit color depth.

Drawbacks or disadvantages of H.265 (HEVC)

Following are the drawbacks or disadvantages of H.265 (HEVC):
➨It requires more processing power compare to H.264.
➨Use of H.265/HEVC codec is subject to licensing and hence manufacturers are required to pay royalties. This increases cost of the devices which uses H.265 codec.
➨It is computationally expensive due to larger prediction units and expensive motion estimation (Intra prediction with more nodes, asymmetric partitions in inter prediction).
➨H.265 has been adopted recently. Hence it will find compatibility issues with legacy hardware and legacy software.
➨H.265 codec is complex compare to H.264. Hence video professionals require additional training and resources.

• Also refer advantages and disadvantages of H.264 video codec >> and H.266 video codec >>.



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