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Fix Microsoft Stream Not Detecting Audio in MOV Video Transcripts

Tauseeq Magsi Oct 12, 2026 870 views

Question details

The user needs to resolve an issue where Microsoft Stream fails to detect the audio track in a MOV file during transcript generation.

How to Fix Microsoft Stream Not Detecting Audio in a MOV Video

Product: Microsoft Stream
Device & OS: not provided
Scenario: Generating a video transcript for an uploaded MOV file in Microsoft Stream.
Observed behavior: Microsoft Stream reports the MOV file has no audio and fails to generate a transcript, even though the video has a working audio track.

Before you start

Ensure that your MOV file plays with sound locally on your device using a standard media player to verify the audio track is not corrupted before uploading.

Solution 1Recommended

Convert the MOV File to a Supported MP4 Format

Converting your MOV video to an MP4 or another universally supported format can often bypass codec compatibility issues in Microsoft Stream.

Microsoft Stream may occasionally struggle with specific audio codecs nested within MOV containers. Converting the file to MP4 format ensures maximum compatibility for both playback and automated transcription.

Open a video converter

Use a reliable offline or online video converter, such as VLC media player, Handbrake, or a trusted web-based conversion tool.

Select MP4 as the output format

Choose MP4 as your output format. For best results, ensure the video codec is set to H.264 and the audio codec is set to AAC.

Convert and save the file

Start the conversion process and save the newly generated MP4 file to a known location on your local drive.

Re-upload to Microsoft Stream

Navigate back to Microsoft Stream, upload the new MP4 video, and attempt to generate the transcript again.

Convert the MOV File to a Supported MP4 Format

Recommended Format: MP4 with H.264 video and AAC audio is the most reliable format for Microsoft Stream features, including automatic captioning and transcript generation.

Solution 2

Report the Issue to the Microsoft Community

If format conversion does not solve the problem, the issue might be specific to your Microsoft Stream environment and requires official support.

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Frequently Asked Questions

Why does Microsoft Stream say my video has no audio when it does?

This usually happens due to unsupported or uncommon audio codecs nested within the video container, particularly in MOV files. While local media players can decode it, Microsoft Stream's backend transcription engine might fail to read the specific audio track.

What are the best video formats to use for Microsoft Stream?

MP4 files encoded with the H.264 video codec and AAC audio codec are widely recommended. They offer the highest compatibility for seamless web playback and backend transcript generation in Stream.

How long does it take for Microsoft Stream to generate a video transcript?

Transcript generation time generally depends on the length of the video. It typically takes about 1 to 2 times the video's total duration for the system to fully process the audio and generate captions.

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