Deck 12: Incorporating Video and Audio

Question 1

Older browsers rely on additional software to play videos, such as the most widely installed program, Adobe Acrobat._________________________

Answer 1

False

Question 2

Because an audio element contains no visual content, it's invisible on a web page unless controls or a poster image are displayed.

Answer 2

True

Question 3

You can nest multiple instances of thesource element within a video element to specify the location and encoding of multiple versions of the same video encoded in different formats._________________________

Answer 3

True

Question 4

Most video on the web is encoded as AAC, MP3, or MOV.

Question 5

The WebM container format commonly uses VP8 or VP9 video encoding._________________________

Question 6

The audio/mpeg MIME type is associated with the AAC audio format._________________________

Question 7

HTML5 introduced an audio element for linking audio files to a web page and enabling users to control playback.

Question 8

All browsers can decode video and audio.

Question 9

Captions and descriptions are saved in external files and linked to a web page.

Question 10

The WebM container format commonly uses H.264 video encoding.

Question 11

Before a user chooses to play a video, the first frame of the video is displayed by default.

Question 12

Each encoding method is known as a codec-short for coder/decoder._________________________

Question 13

Even if a video element contains one or more nested source elements, it's still important to include the src attribute for the video element.

Question 14

Descriptions consist of text that is overlaid on a video image and describes the audio portion._________________________

Question 15

HTML5 does not enable you to incorporate support for video that works for users of older browsers.

Question 16

The autoplay attribute indicates that the browser should restart playback each time it reaches the end of a video._________________________

Question 17

To preserve the layout of your web pages in browsers that are unable to render video content, you can provide a poster image._________________________

Question 18

The src attribute of the video elementspecifies the name and location of the video file to display._________________________

Question 19

Video controls displayed by browsers typically include a full-screen button.

Question 20

Four main video codecs are in wide use on the web today: Flash, Theora, VP8, and VP9._________________________

Question 21

The presence of the controls attribute in the video element instructs browsers

A) to add their default controls.
B) to hide their default controls.
C) to block user control of playback.
D) to begin playing the video immediately when the page is loaded.

Question 22

The __________ attribute of the video element specifies the container format used to encode the file.

A) autoplay
B) type
C) loop
D) src

Question 23

An encoded set of video data is known as a(n) ____.

A) encoding
B) stream
C) container
D) plugin

Question 24

When using Ogg, a common audio encodingis ____ audio.

A) Opus
B) AAC
C) Theora
D) H.264

Question 25

Video controls typically include a play button, a position bar for visualizing the progress of the video during playback with a slider for moving forward or backward in the video, one or more options for adjusting the ____ level, and a full-screen button.

A) video speed
B) audio
C) color
D) download rate

Question 26

It's generally best to reference multiple video files, each specifying the same video but in different ____ formats, to accommodate the potential range of your users' browser capabilities.

A) encoding
B) container
C) Both A and B.
D) Neither A nor B.

Question 27

While most container formats can accommodate a variety of codecs, each container is commonly used with one or two specific ____ codecs.

A) audio
B) video
C) Both A and B.
D) Neither A nor B.

Question 28

To make a Flash video available to older browsers, you use the object and __________ elements.

A) param
B) flash
C) source
D) embed

Question 29

Playing a video or audio file on a computer has traditionally required a program, known as a helper program or a ____, that can both unpack the relevant container and decode the video and audio streams.

A) plugin
B) container
C) codec
D) stream

Question 30

video/x-flv is the MIME type for __________.

A) Flash Video
B) MPEG-4
C) Ogg
D) WebM

Question 31

All modern browsers can play MPEG-4 videos encoded with the __________ codec.

A) H.264
B) Theora
C) VP8
D) VP9

Question 32

The autoplay attribute of the video element indicates

A) that the video should begin playing immediately when the page is loaded.
B) that the browser should restart playback each time it reaches the end of the video.
C) that user control of playback should be blocked.
D) that the browser should download the video file when opening the web page.

Question 33

Whichof the following is a popular container format on the web today?

A) WebM
B) H.264
C) VP8
D) Vorbis

Question 34

When using Ogg, a common video encoding is ____ video

A) H.264
B) AAC
C) Theora
D) VP8

Question 35

When using MPEG-4, the common video encoding is ____.

A) AAC video
B) H.264 video
C) VP8 video
D) Theora video

Question 36

The process of transforming a ____ into a digital file is known as encoding.

A) moving image
B) sound
C) Either A or B.
D) Neither A nor B.

Question 37

When using MPEG-4, a common audio encoding is ____ audio

A) VP8
B) Theora
C) Opus
D) AAC

Question 38

The loop attribute of the video element indicates

A) that the browser should restart playback each time it reaches the end of the video.
B) that user control of playback should be blocked.
C) that the video should begin playing immediately when the page is loaded.
D) that the browser should download the video file when opening the web page.

Question 39

The container format is expressed using the relevant MIME type, which is a standardized value used to reference a __________ type.

A) data
B) web
C) download
D) transaction

Question 40

One of the most commonly used helper programs for playing web video and audio is __________.

A) Windows Media Player
B) Apple iTunes
C) Adobe Acrobat
D) Adobe Flash Player

Question 41

​
​

Referring to the code shown in the figure above, which element specifies the fallback image?

A) video
B) source
C) param
D) img

Question 42

​
​

Referring to the figure above, which code is a cue time range?

A) WEBVTT FILE
B) 1
C) 00:00.000 --> 00:31.000
D) A bush with purple flowers is covered with many dark butterflies, some of which slowly beat their wings.

Question 43

Lu wants users' browsers to display their own default controls to the video element.To do this she adds the ____attribute.

A) buttons
B) controls
C) default
D) play

Question 44

Researchers are continually trying to find new ways to encode video and audio that result in smaller __________ sizes.

Question 45

​
​

Referring to the figure above, which code is cue text?

A) NOTE
B) 1
C) 00:00.000 --> 00:31.000
D) A bush with purple flowers is covered with many dark butterflies, some of which slowly beat their wings.

Question 46

​
​

Referring to the code shown in the figure above, which element specifies the path and filename of the video file for older browsers?

A) video
B) source
C) object
D) param

Question 47

Both captions and descriptions are written in __________.

A) WebVTT
B) HTML
C) CSS
D) None of the above.

Question 48

Patrice wants to display an image for each audio clip.To do so, he uses __________.

A) the poster attribute
B) the img element
C) the height and width properties
D) the height and width attributes

Question 49

​
​

Referring to the code shown in the figure above, which element specifies the poster image?

A) video
B) source
C) object
D) img

Question 50

Lu wants to include an image that users see before they play the video.To do this, she uses __________.

A) the poster attribute
B) the object element
C) the param element
D) the img element

Question 51

​
​

Referring to the figure above, which code is a cue name?

A) WEBVTT FILE
B) NOTE
C) 1
D) 00:00.000

Question 52

A(n) __________ image is displayed before a video is played.

A) poster
B) fallback
C) lead-off
D) alternate

Question 53

​
​

Referring to the code shown in the figure above, which of the following is most likely the video codec used in the source file bfly.webm?

A) H.264
B) Theora
C) VP9
D) Flash

Question 54

Although you can control the size of the video element with CSS style rules, yostill need to specify the width and height of the object element using __________.

A) attributes
B) parameters
C) child elements
D) JavaScript

Question 55

Patrice specifies a MIME type of audio/mpeg for each of his clips.This is because the clips are encoded in which audio format?

A) AAC
B) mp3
C) Opus
D) Vorbis

Question 56

Which element used in adding video to a web page is not also used when adding audio?

A) source
B) object
C) param
D) img

Question 57

Lu wants to make her video accessible for users who are deaf or hard of hearing.To do so, she includes __________.

A) captions
B) descriptions
C) narration
D) a fallback image

Question 58

​
​

Referring to the figure above, which code indicates the start of a comment?

A) WEBVTT FILE
B) NOTE
C) 1
D) 00:00.000

Question 59

A(n) __________ image is displayed in browsers that do not recognize the video element and cannot render the video specified by the object element.

A) poster
B) fallback
C) lead-off
D) alternate

Question 60

Lu wants to make her video accessible for users who are blind or have low sight.To do so, she adds __________.

A) captions
B) descriptions
C) narration
D) a fallback image

Question 61

You can nest multiple instances of the __________ element within a video element to specify the location and encoding of multiple versions of the same video encoded in different formats.

Question 62

You specify a file's container format using the relevant __________ type.

Question 63

Each encoding method for video and audio is known as a(n) __________.

Question 64

Matching
Match each HTML element with its use in creating web video and audio.
a. includes the content of an external resource, such as Flash video, in the current web page
b. when multiple versions of the same video are used, specifies the location and encoding of one version of the video
c. contains all other elements used to add video
d. defines one or more parameters related to an external resource
e. specifies an image to be displayed in browsers that cannot render any of the video content
param

Question 65

Explain why it is necessary to provide a Flash fallback when you include video or audio in a web page.

Question 66

Encoded video and audio are packaged for distribution within a file known as a(n) __________.

Question 67

A(n) __________ is a program that can both unpack a container and decode the video and audio streams.

Question 68

Matching
Match each HTML element with its use in creating web video and audio.
a. includes the content of an external resource, such as Flash video, in the current web page
b. when multiple versions of the same video are used, specifies the location and encoding of one version of the video
c. contains all other elements used to add video
d. defines one or more parameters related to an external resource
e. specifies an image to be displayed in browsers that cannot render any of the video content
object

Question 69

Explain what captions and descriptions are and how incorporating them into web videos can make the videos more accessible.

Question 70

Matching
Match each HTML element with its use in creating web video and audio.
a. includes the content of an external resource, such as Flash video, in the current web page
b. when multiple versions of the same video are used, specifies the location and encoding of one version of the video
c. contains all other elements used to add video
d. defines one or more parameters related to an external resource
e. specifies an image to be displayed in browsers that cannot render any of the video content
img

Question 71

Matching
Match each HTML element with its use in creating web video and audio.
a. includes the content of an external resource, such as Flash video, in the current web page
b. when multiple versions of the same video are used, specifies the location and encoding of one version of the video
c. contains all other elements used to add video
d. defines one or more parameters related to an external resource
e. specifies an image to be displayed in browsers that cannot render any of the video content
source

Question 72

An encoded set of video data is known as a(n) __________.

Question 73

Explain the uses of the kind, label, src, and srclang attributes of the track element.

Question 74

Matching
Match each HTML element with its use in creating web video and audio.
a. includes the content of an external resource, such as Flash video, in the current web page
b. when multiple versions of the same video are used, specifies the location and encoding of one version of the video
c. contains all other elements used to add video
d. defines one or more parameters related to an external resource
e. specifies an image to be displayed in browsers that cannot render any of the video content
video