Explanation/Reference:
Explanation:
Azure Video Indexer is a cloud application built on Azure Media Analytics, Azure Search, Cognitive Services (such as the Face API, Microsoft Translator, the Computer Vision API, and Custom Speech Service). It enables you to extract the insights from your videos using Video Indexer video and audio models described below:
Visual text recognition (OCR): Extracts text that is visually displayed in the video.

Audio transcription: Converts speech to text in 12 languages and allows extensions.

Sentiment analysis: Identifies positive, negative, and neutral sentiments from speech and visual text.

Face detection: Detects and groups faces appearing in the video.

References:
https://docs.microsoft.com/en-us/azure/media-services/video-indexer/video-indexer-overview