Step 1: Understand the task
The task is to find a way to get free AIgenerated subtitles.

Step 2: Identify potential solutions
There are several potential solutions to obtain free AIgenerated subtitles, including online tools and software.

Step 3: Research online tools and software
Some online tools and software offer free AIgenerated subtitles, such as YouTube's automatic captioning feature, online subtitle generators, and opensource software.

Step 4: List potential options
Some potential options include:
YouTube's automatic captioning
Online subtitle generators like Kapwing, Rev.com, or GoTranscript
Opensource software like FFmpeg with AI models

Step 5: Evaluate the options for free
YouTube's automatic captioning is free for YouTube videos.
Some online subtitle generators offer free trials or limited free services.
Opensource software can be free but may require technical expertise.

Step 6: Consider the limitations and quality
The quality and accuracy of AIgenerated subtitles can vary、Free services might have limitations such as file size, video length, or accuracy.

Step 7: Provide a concise answer based on the steps
To get free AIgenerated subtitles, one can use YouTube's automatic captioning for videos uploaded to YouTube, utilize online subtitle generators that offer free services or trials, or explore opensource software solutions.

The final answer is: YouTube自动字幕, Kapwing, Rev.com.