Knowledge Checks

.6-4

Manifest file. What is the purpose of a manifest file in a streaming multimedia setting?

To let a client know where it can retrieve different video segments, encoded at different rates

To let a OTT (Over-the-top) video server know the video that the client wants to view.

To allow a client to reserve bandwidth along a path from a server to that client, so the client can view a stream video without impairment.

Allows a video service to log the video and the server from which a client streams a video.

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1/4

CDNs.

What approach is taken by a CDN to stream content to hundreds of thousands of simultaneous users?

Store/serve multiple copies of videos at multiple geographically distributed sites.

Allow client devices to send requested content to each other, in order to offload the CDN infrastructure.

Proactively push videos to a client device before they’re requested, using machine learning to predict requested videos.

Serve video from a single central “mega-server” with ultra-high-speed network connectivity, and high-speed storage.

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2/4

Streaming video definitions.

Match the definition/function of an element or approach in a networked streaming video system, with its name.

Question List:

A unit of video, each of which may be encoded at multiple different rates, stored in different files.

A file containing the location and encoding rate of files corresponding to video segments in a video.

An approach that allows a client to adapt the encoding rate of retrieved video to network congestion conditions.

A CDN approach that stores content in access networks, close to clients.

Answer List:

Video frame
Enter deep
Chunk
DASH
Over The Top (OTT)
Manifest

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3/4

What is DASH?

In DASH (Dynamic, Adaptive Streaming over HTTP), a server divides a video file into chunks that ... (pick best completion from below)

... are stored, each encoded at multiple rates (video quality). The client receives multiple video chunks (encoded at different rates) and plays out the chunks that best fit the screen size.

... allow premium users to avoid watching chunks that contain commercials.

... are downloaded just before their playout time. Chunking is used primarily because a viewer may jump around (e.g., fast forward) in a video.

... are stored, each encoded at multiple rates (video quality). The client plays the video chunk-by-chunk, with each chunk requested at encoding rate that fits the available bandwidth at the time.

... are download smallest-chunk-first in order to maximize the number of chunks received.

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4/4

Knowledge checks

.6-4

CDNs.

Streaming video definitions.

Question List:

Answer List:

What is DASH?