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    Web end H.265 player research and development decryption

     

    "The audio and video codec is a relatively small area, involving the text, graphics, image, audio, and video of the text, graphics, image, audio, and video in streaming media technology can be applied to specific practice. The multimedia field has more than two years, and it is necessary to have a certain output. We have a self-developing web player and support H.265 decoding. In the context of the code rate optimization (maintain the image quality, apply image enhancement, ROI area Detection, intelligent scene classification, and H265 codec can reduce the code stream 50%. Decrease bandwidth cost, improve video service QoE's purpose), and truly achieve the whole area coverage of H265 decoding. Player overall architecture Our player's overall architecture is designed as follows: This article mainly shares the solution, decoding, and playback of our WEBASSEMBLY implementation H.265 format. background H.265 is also known as HEVC (full name High Efficiency Video Coding, high efficiency video coding), is the successor of the ITU-T H.264 / MPEG-4 AVC standard. Compared to H.264, H.265 has a higher compression ratio, it means that the same rate (also known bit rate refers to the number of bits (BIT) per second. The unit is BPS (Bit Per Second), bit The higher the rate, the more data is transmitted per second, the clearer the picture quality), the picture quality of the H.265 will be clearer, the higher compression rate can use lower storage and transmission costs. Bandwidth Cost: H. 265 at a limited bandwidth can transmit higher quality network video, in theory, H.265 is maximum only H.264's half bandwidth can transmit the same quality video. Lower bandwidth can better reduce storage and transfer costs, and make a pavement for more complex and fun interactive gameplay for future video and live broadcast fields. Transcoding cost: But the current mainstream browser does not support H.265 native video playback, so usually, the video production side needs to make a transcodation of H.264 video for the browser to adapt the browser, such as the PC scene, and Added transcoding costs. For example, in Taobao live, it is assumed to calculate 50,000 games per day, each live transcoding cost is 20 yuan, one day is 1 million transcoding costs. To this end, our team has explored the feasibility and compatibility of the browser-end H.265 video playback, preparing for the full amount of H.265 of the mobile terminal and the PC side, and also conducts the browser end audio processing, WebAssembly practice An in-depth attempt. H.264 vs H.265 H.264 is the most widely used video coding format, and the H.265 standard surrounds the existing video coding standard H.264, reserves the original technologies, and improves some related technologies. New technology uses advanced technology to improve the relationship between code stream, coding quality, delay and algorithm complexity, reaching optimization settings. Both H.265 and H.264 are block-based video coding techniques, the main difference is the size of the coding unit and some encoding algorithm details, and the H.265 divides the image as "Coding Tree Unit, CTU", Instead of 16 × 16 macroblocks like H.264. According to different coding, the size of the coding tree unit can be set to 64 × 64 or limited 32 × 32 or 16 × 16. In general, the larger the block size, the better the compression efficiency. The specific algorithm and related details are not specifically expanded here, and some other compression algorithms such as the open coding formats such as AV1, such as the H.265 patent restriction, readers can refer to other related articles. As shown below, you can see that the same subjective picture quality, H.265 (500K) requires only H.264 (800K) with a bandwidth code rate. Browser status As shown below, because H.265 patent and hard solution support is not perfect, mainstream modern browsers are not compatible with H.265 encoded video playback (EDGE new version is supported by plug-in mode, "but because Apple is H.265 Support (here the author thinks this may be a very important sign, because the development of technology is not just the decision of this technology itself, but many factors work together, business is also important factor), mobile iOS Safari supports native playback at version 11.0 or more. Want to play the H.265 video native

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