Home Theater Network () In the past 2014, the most heard word in the audio-visual field was “4Kâ€. If you go to the home appliance digital store, you will be impressed with the "4K TV", "4K display", "4K graphics card", "4K player" and other large "4K" tags.
So what is 4K? According to Baidu Encyclopedia, 4K Resolution (4K Resolution) is an emerging standard for digital cinema and digital content. The 4k name comes from its horizontal resolution of about 4000 pixels. The 4K movie resolutions common in the film industry include Full Aperture 4K (4096 x 3112) and Academy 4K (3656×2664). The 4K display is more than 4 times the most popular full HD 1080p (1920×1080). If the visual feeling of 1080p is clear, then 4K can be said that even the skin texture is not missed.
Today I am talking about the core code HEVC of 4K movies, also known as H.265. HEVC is short for High Efficiency Video Coding and is a new video compression standard. HEVC/H.265, which claims to "play the same quality video with only half the bandwidth of the original", can more than double the compression efficiency compared to the current compression standard H.264/AVC, which is commonly used in network video. Support 4K movies and even 8K movies. Therefore, the video coding of HEVC/H.265 is considered to be a golden partner of 4K movies.
The compression ratio of HEVC/H.265 coding technology "doing more with less" can also play a huge role in the online video field of the Internet. For example, if the user's home broadband is 10M, H.264 720p video can be played online smoothly, but when watching H.264 1080p full HD video, the card is severe. The 1080p network video encoded by HEVC can be viewed smoothly under the 10M network bandwidth (H.264 720p/HEVC 1080p bandwidth demand is close). Therefore, HEVC coding technology effectively improves the picture quality of network video under the same network bandwidth. The following two sets of test charts from Zhongguancun Online are used to compare and verify:
"Captain America 2: Winter Warrior" decoding information
"Need for Speed" 1080p point-to-point image comparison
The most important factor in buying a box to watch 4K movies is the ability to decode the HEVC/H.265 format in hardware. If you only use software to decode HEVC/H.265 video, the process of software decoding operation requires a lot of CPU space and memory resources, which will cause a certain amount of time to be stuck every few tens of seconds during playback, and the CPU life will be greatly depleted. .
At present, many ARM processors support HEVC/H.265 hard solutions, such as NVIDIA's Tegra K1, Qualcomm's Snapdragon 810, and Rockchip RK3288, which are more concerned. However, the high price of Snapdragon 810 is not suitable for the box below 1,000 yuan; but Tegra K1 does not have complete H.265 hardware acceleration, a lot of work is handed over to NVENC, CPU for processing, a little bit hang; so it only counts as "running The Rockchip RK3288, which is divided into the king, the game king and the ultra clear king, is the most grounded 4K and H.265 hardware decoding solution in the industry.
At present, most of the boxes on the market only support 1080p full HD, and not much support for 4K.
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