With the rapid development of audio and video, video coding often uses H.264 and H.265 coding techniques. The definition of video coding refers to a way to convert a file in a certain video format into another video format file through a specific compression technology. Common audio and video coding has H.264 series and H.25 series.
Introduction to H264 and H265:
H.264 ( short for MPEG-4 AVC (Advanced Video Codec, Advanced Video Codec). H.264 and H.265 are both a video compression standard, and it is also a widely used high For high-precision video recording, compression and distribution formats, most HD cameras on the market currently use H.264 encoding technology.
H.265 (HEVC, High Efficiency Video Coding) is a new generation of video encoding technology. It revolves around The existing video coding standard H.264 retains some of the original technologies, and uses new technologies to improve and optimize certain aspects, such as bit stream, coding quality, delay, etc., to improve compression efficiency, enhance robustness and error recovery capabilities , Reduce real-time delay, reduce complexity, etc.
The core advantage of H.265 is that compared with previous standards, it can greatly reduce the compression rate under the same image quality. From the perspective of objective improvement, According to the test, H.265 has a bit rate reduced by about half compared to H.264 at 1080P resolution, and the higher the resolution, the more significant the advantage.
H264 and H265 comparison: The transmission bit rate of
H264 can be lower than 1Mbps to achieve standard definition digital images. Transmission;
H265 can transmit 720P (resolution 1280*720) ordinary high-definition audio and video transmission at a transmission speed of 1~2Mbps. The
H.265 standard also supports 4K and 8K ultra-high-definition video, so H.265 has lower The transmission bit rate.
Comparison of H264 and H265: Compression rate
The compression ratio of H.264 is more than 2 times that of MPEG-2 and 1.5 to 2 times that of MPEG-4. Under the effect of low bit rate, H.264 saves users download time and data traffic charges and reduces costs.
H.265 not only has a high compression ratio, but also has high quality and smooth images. Video surveillance using H.265 encoding requires less bandwidth, faster and more economical transmission.
Video compression technology is the core technology of the video codec. H264 and H265 encoding technology can be determined according to the actual situation of the project. Relatively speaking, the price of H265 technology is definitely higher than that of H264.
H.264 is also widely used in network streaming data, various high-definition TV broadcasts, and satellite TV broadcasts. In summary, H.265 is mainly to improve compression efficiency, improve robustness and error recovery capabilities, reduce real-time delay, reduce channel acquisition time and random access delay, and reduce complexity.