Use these free tools to extract the audio from an mp4 video and transcribe it into a Word document.
Step 1 - extract the audio to an mp3.
Step 2 - transcribe the mp3 using Word.
Step 1. Use VLC Media Player to extract the audio to an mp3 file
- Click Media > Convert/Save
 - Click the Add button and browse to select the file.
 - Click Convert/Save to bring up the Convert window. Set the Profile to Audio-MP3 and click the wrench icon.
 - On the Enscapsulation tab, select RAW and then click Save.
 - Back on the Convert window, set the Destination file by clicking Browse. You can change the existing name by changing the end to mp3.
 - Now click Start and wait for it convert. The main VLC Player window will show a progress bar, as if you were playing the file.
 - After it's done, look in the destination folder to find your mp3 file.
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Step 2. Use Microsoft Word Online to upload and transcribe the mp3 file