Question: Why do most videos only have one video stream and one audio stream?
answer:
Most video files usually contain only one video stream and one audio stream because this combination is sufficient for general multimedia needs and reduces complexity and file size. Here are some reasons why most video files only contain one video stream and one audio stream:
General video requirements: Most common video content, such as movies, TV shows, online videos, etc., only require one video stream and one audio stream Stream to present content. This simple combination is enough to provide an audio-visual experience.
Reduce file size: Files containing multiple video and audio streams will become larger. For online video streaming, downloading, and storage, smaller file sizes are generally more attractive because they save bandwidth and storage space.
Compatibility: Most players and devices have an easier time handling files with only one video stream and one audio stream. Multiplexing and demultiplexing multiple streams can introduce additional complexity and compatibility issues.
Streaming media: In the field of streaming media, a simple combination of video and audio streams is easier to transmit and process in real time. This is important for real-time video conferencing, live streaming, and online media streaming.
Production and Editing: In video editing and production, multiple audio and video tracks are often processed, but the final export file is usually combined into one video stream and one audio stream for the final audience to watch.
However, there are many exceptions, especially in the professional world. Some special applications require multiple video streams, such as 3D video, multiple camera views, picture-in-picture effects, etc. In addition, some advanced video encoding formats also support multiple audio streams to provide different language or audio quality options.
To sum up, most video files only contain one video stream and one audio stream, as this meets general multimedia needs and provides better compatibility and efficiency. But in some special cases, multiple video and audio streams may be required.