Deck 12: Incorporating Video and Audio

Question 1

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

Answer 1

False

Question 2

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

Answer 2

False

Question 3

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

Answer 3

False

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

All browsers can decode video and audio.

Question 14

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

Question 15

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

Question 16

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 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

Which of the following is a popular container format on the web today?

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

Question 22

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 23

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 24

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 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

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

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

Question 27

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 28

When using Ogg, a common audio encoding  is ____ audio.

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

Question 29

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

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

Question 30

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 31

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

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

Question 32

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 33

When using Ogg, a common video encoding is ____ video

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

Question 34

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

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

Question 35

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

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

Question 36

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 37

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 38

MPEG-4 files use the extension ____.

A) .mp4
B) .m4v
C) Either A or B.
D) Neither A nor B.

Question 39

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

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

Question 40

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 41

Case-Based Critical Thinking Question Lu maintains a website for the local bicycle coalition, a nonprofit organization that she works with. She wants to add video of a recent bike safety class to the site.
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 42

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 43

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

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

Question 44

Case-Based Critical Thinking Question Lu maintains a website for the local bicycle coalition, a nonprofit organization that she works with. She wants to add video of a recent bike safety class to the site.
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 45

Case-Based Critical Thinking Question Lu maintains a website for the local bicycle coalition, a nonprofit organization that she works with. She wants to add video of a recent bike safety class to the site.
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 46

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

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

Question 47

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 48

Case-Based Critical Thinking Question Patrice hosts a radio show on his college station. He wants to post clips from some of his shows on his website for review by potential employers.
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

Case-Based Critical Thinking Question Lu maintains a website for the local bicycle coalition, a nonprofit organization that she works with. She wants to add video of a recent bike safety class to the site.
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 code shown in the figure above, which element specifies the fallback image?

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

Question 52

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

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

Question 53

Both captions and descriptions are written in __________.

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

Question 54

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 55

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 56

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 57

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 58

Case-Based Critical Thinking Question Patrice hosts a radio show on his college station. He wants to post clips from some of his shows on his website for review by potential employers.
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 59

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 60

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

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

Question 61

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

Question 62

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

Question 64

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

Question 65

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

Question 66

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

Question 67

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

Question 68

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

Question 69

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 70

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

Question 71

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