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What’s the Difference Between x264 vs. x265 (HEVC)?


The field of video compression has witnessed significant advancements in recent years, with the emergence of new codecs designed to optimize video quality and reduce file sizes. Two notable codecs are x264 and x265 (HEVC), which have gained popularity in the industry. In this article, we will delve into the differences between x264 and x265, exploring their key features, compression efficiency, performance, and compatibility, to provide a comprehensive understanding of these codecs. SSRmovies provide best quality video and audio we generally use x264 coded because still many devices not supporting x265 HEVC format.


Overview of x264:

x264 is an open-source video codec that employs the H.264/MPEG-4 AVC (Advanced Video Coding) standard. It is widely used and known for its excellent compression efficiency, delivering high-quality video output at relatively lower bitrates. x264 achieves this through advanced motion estimation algorithms, adaptive quantization, and other techniques. The codec’s compatibility is extensive, making it accessible on various platforms, devices, and media players. However, the efficiency of x264 comes at the expense of encoding time, as it requires more computational resources compared to its successor, x265.


Overview of x265:

x265, also known as High-Efficiency Video Coding (HEVC), is the successor to x264 and offers enhanced video compression capabilities. Developed as an improvement over its predecessor, x265 utilizes advanced algorithms to achieve better compression efficiency, resulting in smaller file sizes while maintaining high-quality video output. The HEVC standard employed by x265 provides more flexibility in managing bitrate allocation, allowing for improved video delivery across different platforms and network conditions. Moreover, x265 utilizes parallel processing and hardware acceleration to reduce encoding time, making it more suitable for real-time encoding and streaming applications.


Compression Efficiency:

One of the primary objectives of video codecs is to achieve high compression efficiency without compromising video quality. In this regard, x265 surpasses x264 by employing advanced coding techniques. x265 achieves superior compression efficiency by utilizing larger block sizes, improved motion compensation, and more sophisticated entropy coding. This allows x265 to deliver equivalent video quality at lower bitrates compared to x264. Consequently, x265-encoded videos consume less storage space and require lower bandwidth for streaming, making it an ideal choice for applications with limited storage or network resources.


Performance and Encoding Time:

x264 and x265 differ in terms of performance and encoding time due to their varying compression techniques. While x264 is known for its higher encoding time, x265 offers improved encoding speed thanks to parallel processing and hardware acceleration. The larger block sizes used by x265 enable better parallelization of the encoding process, leveraging multi-core processors efficiently. Consequently, x265 achieves faster encoding times, making it more suitable for real-time applications, live streaming, and hardware-constrained devices.



Both x264 and x265 codecs have widespread compatibility across platforms, media players, and devices. However, due to the relative novelty of x265, some older devices or media players may lack support for this codec. On the other hand, x264 has been available for a more extended period, making it universally accessible. Additionally, x265-encoded videos may require more computational resources for decoding compared to x264-encoded videos. However, with the growing adoption of HEVC and the continuous development of hardware decoding capabilities, compatibility issues with x265 are becoming less prevalent.



In conclusion, x264 and x265 (HEVC) are two prominent video codecs that offer different advantages and applications. While x264 excels in compatibility and has excellent compression efficiency, x265 surpasses it in terms of compression efficiency and encoding speed. The choice between these codecs depends on specific