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2022-11-09 17:16:58 45
Due to the impact of the epidemic, offline shopping is feeling the crisis, with many merchants turning to online sales. At this time, live mall app source code for the existence of businesses to provide sales channels. Live mall app source code gradually out of the circle, the user group expanded to all ages. All platforms have seen the prospect of commodity live streaming, and they are developing app source code for live streaming one by one.
First, the details of the app development of the live shopping mall
1. Streaming media protocol
Live store app audio and video data source transmission needs specific protocols to transmission, the basic distribution in the session layer, presentation layer and application layer. The most commonly used streaming protocols of live streaming mall app include RTMP, HLS, RTSP, etc. Different protocols have different characteristics and disadvantages. Which protocol can be used according to the specific situation of the platform.
2. Push and pull the flow
Push and pull stream is the specific process of audio and video transmission of live mall app source code can be roughly divided into five steps: collection, encoding, push stream, pull stream and decoding. For the specific push and pull streams, the corresponding streaming protocol needs to be used.
In fact, before the audio and video push, there is another step, which is encapsulation. Therefore, the audio and video data needs to be unwrapped before being pulled and decoded. Unmarshalling is the process of unmarshalling an image before playing audio and video, separating media data from streaming media data.
2. Decoding related content of live streaming mall app
1. SPS and PPS
What is the parameter that decides live mall app source sound and video quality? SPS and PPS parameters such as, resolution, frame rate, sample rate are determined and are usually stored at the beginning of the code stream. These parameters are so important that if they are missing, the next step cannot be decoded.
2. IBP frame
H and 264 encoding video frames are divided into I, B and P video frames, I frame is also the key frame of the video. Usually, the decoding starts with the I-frame. If the I frame is lost during decoding, the entire source code of the Direct broadcast Mall app will be discarded GOP group to avoid the phenomenon of the screen due to the loss of reference frames.
3. Time stamp
The Live store app has two source time stamps, DTS and PTS. DTS decoding timestamp, which tells the player when to decode this frame of data during playback. PTS It displays the timestamp. Its function is to tell the player when to play this frame data while playing audio and video data. It can be seen that DTS and PTS should pay attention to this point in the development process of the audio and video synchronization system of the live mall app.
The development of live mall app in the source code, details are very important, may miss a little detail, will make the system problems, such as time stamp, data frame loss and so on.
There was no concept of real-time interaction in the source code of early game app, so it was limited to functions such as order or private message chat. Under the limited technical level, one-way audio and video transmission delay was as high as 3-5 seconds. In recent years, with the development of CDN technology and RTC technology, the source code of the app accompanying the game not only realizes the real-time audio and video interaction, but also controls the delay within 400ms.With the increasing pressure of people's lives and the accelerating pace of life, sharing experiences online in real time has become a mainstream demand, so is playing games with games. app source code also ushered in a new development climax, especially play together, open black network real-time interaction, so that people more quickly immersed in the game world.First, audio and video connection ultra low latency experience ideasWhen audio and video are connected in the source code, the transmission process of streaming media is mainly realized by collection, processing, encoding, transmission, decoding and other links. Since each link generates new data based on the consumption of the previous process data, whether the delay will increase with the continuous accumulation of links, delay optimization needs to start from each link.1. At the collection end, play the game app to adjust the underlying interface of the source code to reduce the delay in the collection process.2. In the processing stage, optimize the processing method, simplify the processing of necessary 3A processing algorithm, reduce unnecessary pretreatment methods, and reduce the source code of the game Playmate app in the delayed processing stage.3, in the codec stage, through hard codec to improve the encoding efficiency of audio and video data, reduce the delay.4. In the transmission stage, real-time monitoring and active detection of the transmission network need to be realized.Two, game to play app source code voice even Mai technical support1. RTC transmission protocol: RTC transmission protocol is adopted during development to ensure low latency transmission of audio and video data and achieve better real-time interactive experience.2. Real-time audio and video technology: In the multi-person voice chat room, users of the microphone use real-time audio and video technology to achieve voice connection, to ensure the fluency of real-time voice interaction between users and the authenticity of audio quality.3. Bypass live streaming technology: In the voice chat function of the source code of the game app, the audience does not have high real-time requirements for the wheat voice data, so the bypass live streaming method is adopted to achieve the transmission of the audience's voice information, saving more development costs.As far as source code market is concerned, real-time interaction between users and real-time pan-entertainment is the main development direction in the future. As technology advances, more powerful audio and video technologies will emerge, codecs will become more and more high-quality, and ultra-low latency real-time interaction will become more and more refined.2022-11-07 17:57:31 61
Short video APP users stay for a long time, have high stickiness and use frequency. Second-day, 7-day and even monthly retention rates are also high, and most companies are doing their own product development and will also integrate vertical sorting or some community short video features. The short video industry is so popular because it takes full advantage of the two characteristics of mobile phone recording and fragmented time, and the short video app development business has become familiar to the public.The key point of short video APP development recording module is frame data acquisition. In addition to video frames obtained through the camera, video frames can also be obtained through screen recording, mainly through the microphone to obtain audio frame data; The module mainly realizes the built-in beauty/filtering function. In addition, due to the CallBack mechanism of texture and YUV data, beauty, filters, effects and other functions of third-party libraries are also supported. The processed data will be cut, scaled, rotated and so on through OpenGL. While this work can be done by CPU, it can be time-consuming, and GPU is a more sensible choice. Finally, after the texture is obtained, it will be divided into two ways, one is render display, the other is encode and encapsulate. These two threads share the same texture, which significantly reduces resource usage and improves SDK productivity.In the development business server side of the short video APP, when the producer makes a video and upload it to the business server, the system will store Matedata in the short video and store it in the data source, and the real short video file will be stored. It is important to note that some small carrier DNS caches can reduce the upload success rate, and we need to overcome this problem through technical optimization. When a user consumes this short video, he uses CDN to accelerate the whole process and improve the consumption experience. At the same time, CDN can also help us improve the cache hit ratio and save bandwidth cost. Some users often consume high-quality video content without reliable operation background, which can help video producers complete editing, recommendation, classification and other work. Now we often use a lot of things. APP portraits will be constructed according to user behavior, and these contents will be labeled by manual labeling or algorithmically generated, so as to understand the content that users are interested in and accurately recommend. Most portrait and intelligent recommendation system apps This is a very important system that can effectively increase user engagement.With the continuous development of short video APP and the rise of real-time live broadcasting, the pressure of bandwidth will be increasingly greater, so P2P+CDN can be combined. However, the way to alleviate the pressure of server bandwidth, P2P will mainly face the problem of firewall, and the influence of node network quality, but also depends on the heat of video playback. This will have a certain impact on the effect. At the same time, in order to better play fluency, a single P2P cannot meet the demand, and it needs to be assisted by P2P and CDN. Another way to save bandwidth is optimized through better coding standard, h. 265 coding standards, such as by this can save half of the traffic, but now just h. 265 in hard support is not very good, only a few phone models, and compared with the soft encoding h. 264, decoding speed will slow a few times, the energy consumption is higher, Processing is also slow, but as hardware continues to upgrade, H.265 will be the next trend, and some of the above picture coding standards can also be effectively applied to save bandwidth.2022-10-14 17:42:40 61