If your MP4, WAV, or video file has been processing for over 20 minutes, it’s likely too large or there’s an issue with the file, and the Hiro system can’t convert it to MP3.
Here’s how to fix it: Use a free online tool to convert your file to MP3, then upload the MP3 directly to Hiro. There are many free tools but here’s one we like:
https://www.freeconvert.com/mp4-to-mp3
