How to use AI to automatically extract subtitles from online videos and save them?

In today's digital age, online videos have become an important way for us to obtain information, entertainment and learning. However, for many non-native English speakers or those with hearing impairments, the lack of subtitles presents a barrier. Fortunately, the development of artificial intelligence technology provides us with a method to automatically extract and save online video subtitles. This article will introduce several effective methods to help you achieve this goal easily.

First, we can use open source tools designed specifically for processing audio and video files, such as Vosk. Vosk is a powerful speech recognition tool that supports multiple languages ​​and runs locally without relying on an Internet connection. Its main advantages are its ease of use and accuracy. Here are the basic steps for using Vosk:

1. Visit Vosk’s official website (https://alphacephei.com/vosk/) to get the latest version of the software package.

2. Download the corresponding installation package according to your operating system and follow the instructions to complete the installation.

3. Prepare the video file you need to extract subtitles from. Make sure the file is stored somewhere on your computer for easy access.

4. Use the command line tool provided by Vosk to convert video files to audio files. This step can be achieved through multimedia processing tools such as ffmpeg. For example, you can use the following command:

`

ffmpeg -i input_video.mp4 -ab 160k -ac 2 -ar 44100 -vn audio.wav

`

5. Use Vosk to perform voice-to-text operations. This usually involves executing a simple command, the exact format depends on the version you are using. Typically, the command looks like this:

`

python -m vosk.transcribe model_path audio.wav > output.txt

`

6. The extracted text will be saved in a file named output.txt, which you can view and further process through the editor.

Besides Vosk, another recommended tool is YouTube Subtitle Downloader. This tool will be very useful if you often watch videos on YouTube. It helps you download subtitle files of any video directly from YouTube. The following are the specific steps:

1. Open the YouTube subtitle downloader website (https://ytmp3.cc/youtube-to-text/), which is a free online tool.

2. Paste the YouTube video link you want to download subtitles into the input box provided on the page.

3. Click the "Convert" button, wait a moment, and the system will automatically generate a subtitle file for you.

4. Download the generated subtitle file to your computer. You can choose .srt, .vtt and other formats for easy use in various players or editing software.

The above two methods are currently popular and practical methods that can meet the needs of most users. Whether you want to improve learning efficiency or meet the needs of special groups, you can benefit a lot from it. Of course, technology is always improving, and there may be more innovative solutions in the future. I hope this article helps you overcome language and hearing barriers while enjoying video fun.