HTML5 HTML5 Audio and Video 3

Question 1

What is the Web Audio API primarily used for?

Accepted Answer

Processing and synthesizing audio in the browser with JavaScript

Answer

The Web Audio API provides a powerful system for controlling, processing, and synthesizing audio using an audio graph of nodes.

Question 2

Which API is used to capture audio and video from a user's webcam and microphone?

Accepted Answer

MediaDevices.getUserMedia()

Answer

The getUserMedia() method of the MediaDevices API prompts the user for permission and returns a MediaStream from the camera or microphone.

Question 3

What does the MediaRecorder API enable in HTML5?

Accepted Answer

Recording audio/video streams directly in the browser

Answer

The MediaRecorder API provides functionality to record MediaStream data, saving audio and video blobs that can be downloaded or processed.

Question 4

Which video codec is widely supported by HTML5 browsers and uses the .mp4 container?

Accepted Answer

H.264 (AVC)

Answer

H.264 (AVC) in an MP4 container has the broadest HTML5 browser support across desktop and mobile platforms.

Question 5

What event fires on an HTML5 media element when playback has reached the end?

Accepted Answer

ended

Answer

The 'ended' event is fired when playback or streaming has stopped because the end of the media was reached.

HTML5 - HTML5 Web Development Practice Test