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Tools like SpeechText.AI or HappyScribe can take an .avi file and turn it into a transcript.
If the AVI file is just audio (a video of a boy talking), tools like Speechify's or Kapwing's AI voice generators can convert that speech into text, or even create a new narration from a text script. Summary of Steps boy2.avi - BayFiles
Upload the file, select the language, and let the AI generate the text. Tools like SpeechText