Why is there no vocal sound when Vue doubles the speed?

Preface

Vue.js is a popular front-end framework, which is characterized by being lightweight, easy to use, easy to understand, and easy to maintain. Many developers like to use it to develop web applications, but in the process of using Vue.js, some developers will encounter a strange problem: when playing videos at double speed, the audio is gone. Next, this article will detail why this problem occurs and how to solve it.

Cause of the problem

The root cause of this problem is caused by using the double-speed playback function, not a coding error. JavaScript is inherently single-threaded, so Vue.js is no exception. When the video is played at double speed, the playback speed is increased, and the speed of Vue.js single-thread traversing the DOM tree is also accelerated. However, the audio of the video is not accelerated, which causes the problem of no sound at double speed. This is because the DOM tree is traversed too fast and the audio data cannot be transmitted to the browser in time, so no sound is heard.

Solution

1. Don’t use the double-speed playback function

Fundamentally speaking, as long as you don’t use the double-speed playback function, you can guarantee the performance of Vue.js Runs normally and plays audio. Although this method has a good effect in solving the problem, it is not a practical method because video double-speed playback is a good function that can speed up video playback and improve user experience.

2. Using multi-threading

When Vue.js single thread is stuck, we can use Web Worker to achieve multi-threaded operation. A Web Worker is a JavaScript thread that can run scripts in a separate thread that can be called from the main thread. When using Web Worker, we need to let the main thread pass audio data to the worker thread.

3. Optimize the audio and video encoding format

If the audio encoding format is too large, it will cause lag when traversing the DOM tree. Therefore, we can choose an appropriate audio encoding format to reduce the file size and increase the speed of data transmission, thereby avoiding the inability to upload audio data due to too fast DOM tree traversal speed. Of course, the disadvantage of this approach is that it requires higher decoder performance.

4. Appropriately increase the video speed

When using the double-speed playback function, we can appropriately adjust the video speed to ensure audio and video synchronization. By adjusting the speed, we can speed up video playback while ensuring that audio data is transmitted to the browser in a timely manner. This method is relatively easy to implement, but the effect is not very ideal.

Conclusion

The above is the solution to the problem of no sound when Vue.js plays at double speed. In practical applications, we need to choose a suitable solution to deal with this problem according to the specific situation. No matter which method is used, attention needs to be paid to the issue of video speed doubling and audio synchronization, otherwise the user experience will be affected to a certain extent. I hope this article is helpful to developers who may encounter this problem.

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