You have a custom analyzer named analyzer1 that performs the following functions• The transcription of...

 The POST request starts an asynchronous analysis job for video01.mp4. Yes

 You use the URL in the Operation-Location header to poll and retrieve the results. Yes

 The POST does not return the full transcript/key frames in the response body (only 202 Accepted). No

When you invoke a custom analyzer in Azure AI Content Understanding using the analyzers/{analyzerId} endpoint with API version 2024-12-01-preview, the service runs as a long-running operation. The initial response is 202 Accepted and includes an Operation-Location header pointing to the results URL. You then GET that URL to check status and, once complete, obtain outputs (for a video analyzer, this includes transcription and key frames because those capabilities are part of the analyzer definition). The header Ocp-Apim-Subscription-Key is valid for this API.

Microsoft References

Quickstart (REST): asynchronous analyze call returns 202 with Operation-Location; poll to get results. Microsoft Learn

What’s new: API version 2024-12-01-preview. Microsoft Learn

Prebuilt video analyzer functions (transcript + key frames). Custom analyzers inherit configured tasks. Microsoft Learn

REST API surface: Get Result and related operations for analyzers. Microsoft Learn

Security header definition (Ocp-Apim-Subscription-Key). Microsoft Learn