Through continuous resource aggregation, technology iteration and type updating, the production of online audio-visual content has improved from quantity to quality in recent years. Practitioners gradually walked out of the confusion in exploration and began to dig in the direction of high-quality products. In this process, a prominent performance is that many film makers and creators have jumped out of the rut of gathering fantasy, supernatural, thriller and other themes in the past, turned to deeply cultivate the theme theme, moved people with the power of truth, attracted people with excellent texture, and tried to open up more artistic space for the dissemination of mainstream values. In this process, a number of high-quality masterpieces have come to the fore and won high evaluation and enthusiastic response from network users. People are pleasantly surprised to find that in addition to "cool feeling", "sweetness" and "reversal", online audio-visual content can also see so many lovely and respectable characters, diverse and flexible artistic presentation and silent value expression of moistening things. These attempts of practitioners not only make a beneficial exploration to promote the transformation of network audio-visual production from rough to intensive, but also have a positive and far-reaching impact on the diversification of main melody film and television expression from the aspects of subject matter, content, style and form, communication channels and so on. Show the real life and historical situation from the perspective of youth and personalization It has always been an important theme of film and television creation to deeply understand the spirit of the times and actively express the mainstream value. Especially in recent years, major historical events and important time nodes appear frequently. Many film and television creators follow the historical trend and actively participate in the artistic creation of expressing reality, witnessing history and looking forward to the future, forming a creative trend in the whole industry. In recent years, in the process of guiding online audio-visual production to take the road of high-quality products, relevant government departments have begun to scientifically plan and layout topics, and actively and effectively guide video websites and content producers to adjust the supply side. On the one hand, regulate the creation of themes with overcapacity such as fantasy and ancient costumes, and guide producers to improve quality and reduce production; On the other hand, it provides support for the theme works reflecting real life and praising the great era in terms of project approval, broadcasting and publicity. With the joint efforts of several parties, the number and quality of online audio-visual works of the main melody have been steadily improved, and diversified exploration has been tried in the subject field. We are pleased to find that there are more and more online audio-visual works that are down-to-earth and focus on the current social hot spots and livelihood topics. Online films such as sarilang on the grassland, donkey on the tree, green train, green grass in Tibet, I'm from Beijing, and online dramas such as agreement and on the field of hope focus on the themes of the times such as poverty alleviation, Rural Revitalization and supporting the frontier. Under the grand background of social reform and national development, they focus on poverty alleviation cadres, ordinary people, entrepreneurs and support teachers rooted in the countryside, Insight into the subtle folds in the process of changes in real life. It not only brings the burning pain of reality, but also makes people feel the ordinary daily happiness. It has extraordinary performance in touching the depth and breadth of social reality. Compared with traditional film and television dramas, online audio-visual works have small volume, low publicity and distribution costs, and the producers bear little economic pressure. Sometimes they can respond more quickly and flexibly in the face of the hot reality, and have natural advantages in focusing on some new topics, new trends and new phenomena with timeliness. For example, the online movie "China Feixia" aims at the emerging professional "takeout brother" in recent years to show the ups and downs of their lives. This work fills the theme gap of film and television creation, and allows the audience to understand the bitterness, blood and pursuit of ordinary workers. It can be regarded as a successful practice of network audio-visual in theme creation. In addition, looking back at history at an important time node has also become the due meaning of network audio-visual creation. Taking the war to resist US aggression and aid Korea as the story background, online films such as Xin Qiji 1162 and Kung Fu Master Huo Yuanjia, which show the great righteousness of the nation, look back at the extraordinary years with multi-dimensional narrative styles such as youth, personalization and typology, liven up the more serious and rigid historical Narration in the inherent impression, and provide diversified interpretations of the mainstream values in different contexts, While expanding the connotation and extension of the theme in different aspects, it also adds some mellow charm to the network audio-visual creation. The plain and net feeling visual style adapts to the communication ecology of mobile priority Another topic of symbiosis with "network audio-visual products to realize the expansion of the theme of film and television" is the innovative expression of form. Due to the changes of communication media, aesthetic carrier, text form and work audience, network audio-visual works will change from large screen to small screen, which is bound to carry out targeted innovation from scene scheduling, scene composition, editing rhythm and visual style, so as to adapt to the current mobile communication ecology. Network audio-visual theme creation has gradually explored a visual style different from other theme film and television works. Network audio-visual works are mainly broadcast on computers, pads and mobile phones. Due to the great restrictions on the video scene frame, it is not suitable for scene scheduling with long duration, complex actors' positions and complex mirror movement routes. Therefore, sarilang on the grassland, Chinese flying Xia and donkey up the tree have abandoned the gorgeous lens language and used simple and lively picture narration to make the audience focus on the plot arrangement. In order to adapt to the small screen communication, in addition to using panorama when explaining the environment, the scene composition generally takes action and dialogue in medium and close range. Corresponding to this situation, the editing rhythm of online audio-visual works is mostly fast, and there are few long scenes with large scenes and multiple actions. For example, the heavy scene of Li An'an's bravery to rescue the children in distress in China's flying Xia can be divided into several core action paragraphs, such as galloping to the ground, rushing out of the crowd, bravely climbing the stairs and landing safely. The editing rhythm is neat and concise, which shapes the image of the protagonist who always maintains his kind nature despite being at the bottom and encountering embarrassment from time to time. In addition to online movies and online dramas, micro films and short videos have also made great contributions in promoting the innovation of the main theme film and television creation form. For example, the vertical screen aesthetic micro film series "meet you", "accompany you", "warm you", "thank you" directed by Zhang Yimou give full play to the vertical screen characteristics of mobile phones in scheduling and composition. There are also the short film "a bucket" directed by Jia Zhangke. These works are novel in form, warm in content and positive in value. They are a useful supplement to the diversity of the main melody. It is the form innovation brought about by the joint efforts of various factors that has created the visual style of the main melody network audio-visual works, which is relatively plain, close to the people and has a strong sense of network. Multi screen interaction and social communication make the mainstream values deeply rooted in the hearts of the people In the current acceptance environment where multi screen interaction and fragment reading are increasingly becoming the main communication trend, the communication process of online audio-visual works not only breaks the time and space constraints of traditional film and television, but also continues to carry out secondary distribution and social communication with the help of social media and short video platforms, forming a diversified and staggered communication situation, so as to promote the online audio-visual theme works to approach the public Make value exploration deeply into the mainstream. This exploration is mainly carried out at two levels. First, traditional large-scale video websites continue to cultivate vertically, seek change in stability, increase user stickiness through member payment, maintain the advantages of traditional film and television broadcasting channels, and also try to develop theme programs and works with the tonality of online audio-visual. For example, the online drama "agreement" produced by iqiyi is composed of six different stories, and there is no plot continuity between the stories. In this way, users have a greater degree of freedom when watching. They can not only watch at any time, but also don't have to worry too much about the plot connection between the upper and lower episodes. This convenient viewing experience makes it easier for network users to accept the mainstream values contained therein. "I'm from Beijing" is a series of online films, which caused a matrix chain effect after iqiyi and Youku were broadcast. The online drama "on the field of hope", jointly produced by Penguin film and television, has only 24 episodes. Although the volume is small, it has substance, which is also in line with the broadcasting law of current online dramas. A new force suddenly rises. Tiktok Kwai, two, is on the newly emerged short video platform. Nowadays, short video segments such as micro-blog, WeChat, Xiao Hong and other social media, and short video platforms with video social attributes such as jitter, fast hands and so on, are suddenly coming up. The most prominent performance is that users use short videos to popularize and interestingly translate the original work and its mainstream values, and quickly spread the content related to the main melody network audio-visual works among the audience, especially the young audience group through secondary distribution and circle communication. With the emergence of more and more online audio-visual products and constantly detonating various social topics, the production of online audio-visual content has gone beyond the chaotic state of barbaric growth and disorderly development in the past, and increasingly presents a positive and innovative spirit, which is really gratifying for the diversification of the main theme film and television production. (Xinhua News Agency)