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chenqiang@nasinet.com
+86-189-0860-5871
Hubei,China
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.
3. Unseal
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.
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2022-10-14 17:42:40 61chenqiang@nasinet.com
+86-189-0860-5871
Hubei,China
