Vertex fails to analyze .mov files (video/quicktime) containing apac spatial audio

Gemini API
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1

Hi,

According to the official documentation, video/quicktime is listed as a supported MIME type for video understanding with Vertex AI models.

However, when analyzing a .mov video recorded on an iPhone 16 Pro Max using spatial audio (which is enabled by default), the API returns a generic HTTP 400 with "invalid argument" and no further details. This video includes an apac audio stream, as identified by FFmpeg.

If I switch the iPhone settings to record in stereo only - or re-encode the video using ffmpeg to remove the apac stream - the video is accepted and analyzed successfully.

I believe this is either a validation bug or an undocumented limitation.

Could you please clarify:

  • Is apac audio explicitly unsupported?
  • Should .mov files from iOS with spatial audio be preprocessed before being sent to Vertex?
  • Can the error response be improved to identify unsupported streams?

Thanks.

3

Hello,

Welcome to the Forum!!

May I ask which model you are using?

5

Hi @Lalit_Kumar

I believe I have the same issue.

I’m using Vertex API, Gemini 2.5 pro and flash both return the same cryptic 400 invalid argument.

7

Still an issue here in September. mov doesn’t work when trying to send videos from my iphone to the gemini api. If i convert to mp4, it works.

Docs still state mov as accepted.

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