Huawei 20 12 Innovation Lab has carried out human factor engineering experiments on video, tracked the human reaction when watching video through eye movement instruments, physiological instruments and other equipment, established a mathematical model according to the information collected by testing instruments and the information reported by testers, and formulated the U-vMOS scoring standard in order to objectively reflect the user's subjective video experience.
The evaluation model of U-vMOS is mainly divided into three parts:
Namely, video quality, operation experience (sInteraction) and playback experience (s view);
The scope covers video source resolution, source number, playing screen size, operating experience, playing fluency and so on.
The score is 1-5 (5: excellent; 4: good; 3: general; 2: poor; 1: poor).
The bigger the screen, the higher the content resolution, the smoother the viewing and the higher the score.
Video quality quality:
The display screen size of video is recorded as display size, video complexity of video content, video resolution, bit rate and coding type video frame rate.
Specific typical score:
Operating experience interaction:
The live broadcast is recorded as the channel change time, and the initial loading time is recorded as the loading time.
Specific typical score:
Viewing experience view:
In the middle of video playback, because the data packet fails to arrive on time, the video is buffered, resulting in the stuck effect, which has a great impact on the video experience. The deterioration of video quality is mainly related to the length of pause time and the interval between pauses. In the process of watching a long video, the deterioration of video quality is mainly related to the number of jams. When the video is paused, the longer the pause, the worse the experience. When the pause ends and normal playback is resumed, the video quality experience will gradually recover. If it can continue to play normally, the real-time quality experience will return to normal; However, if there is another pause in the process of quality recovery, the quality experience is not only related to the length of this pause, but also to the time distance of the previous pause.
The average duration of multiple pauses is recorded as duration, the average interval between two adjacent pauses is recorded as interval, and the number of blocking events is recorded as frequency.
Specific typical score:
The establishment of this system provides a perfect and unified evaluation standard for video service experience, gives practical guidance and suggestions for operators and video industry chain to enhance user experience, and solves a big problem that has been puzzling the rapid development of video industry. Wang Shengqing, president of Huawei's marketing and solution sales, said: "User experience is the primary productive force, and the quantitative evaluation system of video experience is the propeller of video business development. Huawei hopes that through the improvement and release of this evaluation system, it will provide a unified evaluation standard for the multi-screen, cross-network and cross-service video experience evaluation system of the video industry, so that the video business can achieve faster and more stable development under the unified evaluation standard. "