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Among other features, it offers an AI-based speech-to-text captioning service for transcribing audio.

Automated Audio Transcription

It’s crucially important to review the output transcript for accuracy, as all AI transcription services make mistakes. Microsoft Stream has an interactive transcript editor that lets you easily modify the transcript to correct those mistakes. Once corrected, the entire transcript file can be downloaded for additional offline analysis.

Transcribing Video

1. Upload your video file to OneDrive or a Sharepoint Site.

2. If clicking the file name in OneDrive or Sharepoint does not open the file in Stream:

   1. hover over the file name

   2. click the 3 dots on the right

   3. hover over Open

   4. click Open in Stream

3. Click Video Settings on the right

4. Expand Transcripts and captions

5. Click Generate

   

6. Select the primary language spoken in your video, and click the foreground Generate button

7. Depending on the length of your video, automatic transcription may take a long time (hours) to complete. It’s safe to close the browser tab at this point; transcription will continue on Microsoft’s servers in the background.

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Coerce Audio to Video

If you have an audio-only file to transcribe, you must manipulate the file into a format that Stream considers to be video before Stream will present the transcript generate button. The easiest way to do this is to use the free VLC video player app to copy your audio file to a new file in a specific container format that Stream considers to be video. As of January 2025, Stream will consider any file using the Matroska (MKV) container format to be video, even if it doesn’t contain a video track.

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1. Launch VLC

2. Click File ➡️ Convert / Stream…

3. Click Open media…, then locate and open the audio file you want to convert. Your selected file should now be visible above the Open media… button.

4. If you previously created a profile for this purpose in VLC, select it from the dropdown of profiles, and skip to step (5). Otherwise:

   1. Click Customize…

   2. On the Encapsulation tab, select MKV

   3. On the Audio codec tab, select Keep original audio track (you can ignore the Video codec and Subtitles tabs)

   4. Click Save as new Profile…, give this profile a memorable name like “Microsoft Stream Transcribe Audio”, and click Save

   5. Click Apply

5. Click Save as File, click Browse…, select both the output folder and desired output file name (the extension should default to .mkv), and click Save

6. Review your Convert & Stream window, which should look something like the following. When you click Save, VLC will process your input file using the selected profile, and save the output to your chosen destination file.

   

7. Upload your output file to OneDrive or Sharepoint, then follow the Transcribing Video instructions above to open it in Stream and begin transcript generation.

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