Evaluation 11 Flashcards
(10 cards)
[Unit 11] Write three kinds of frames that a Motion Picture Experts Group output consists of.
Intracoded, Predictive, Bidirectional
[Unit 11] The Internet is full of music and video sites that stream stored media files. Actually, the easiest way to handle stored media is not to stream it. Imagine you want to create an online movie rental site to compete with Apple’s iTunes. A regular Web site will let users download and then watch videos (after they pay, of course). Write the sequence of steps to play media files via simple downloads.
Step 1: Media request (HTTP)
Step 2: Media response (HTTP)
Step 3: Save media
Step 4: Play media
[Unit 11 ] List the (at least two) jobs of media players.
- Manage the user interface
- Handle transmission errors
- Decompress the content
- Eliminate jitter
[Unit 11] The__________________ standard for compressing continuous-tone still pictures (e.g., photographs) was developed by photographic experts working under the joint auspices of ITU, ISO, and IEC, another standards body. It is widely used (look for files with the extension jpg) and often provides compression ratios of 10:1 or better for natural images.
a. Photographic Experts Group
b. Joint Photographic Experts Group
c. Joint Photographic Expert Working Group
d. Photographic Expert Working Group
Joint Photographic Experts Group
[Unit 11] These frames are based on the idea of macroblocks, which cover, for example, 16 × 16 pixels in luminance space and 8 × 8 pixels in chrominance space. A macroblock is encoded by searching the previous frame for it or something only slightly different from it. What are these frames called?
a. C-Frames
b. B-Frames
c. P-frames
d. I-Frames
P-frames
[Unit 11] This frame indicates block-by-block differences between previous and future frames. What is this frame called?
a. C-Frames
b. B-Frames
c. P-frames
d. I-Frames
B-Frames
[Unit 11] Suppose that you will look at streaming live media, for example, broadcast IPTV and Internet radio. What are the steps to play such streaming live media using Web and a media server?
a. 1) Metafile request, 2) Metafile response, 3) Play media, and 4) Save media
b. 1) Metafile request, 2) Metafile response, 3) Handoff metafile, 4) Media request, and 5) Media response
c. 1) Metafile request, 2) Metafile response, 3) Play media, and 4) Handoff metafile
d. 1) Metafile request, 2) Metafile response, 3) Play media, 4) Media request, and 5) Media response
1) Metafile request, 2) Metafile response, 3) Handoff metafile, 4) Media request, and 5) Media response
[Unit 11] This approach is based on mixing up or interleaving the order of the media before transmission and unmixing or deinterleaving it on reception. That way, if a packet (or burst of packets) is lost, the loss will be spread out over time by the unmixing. It will not result in a single, large gap when the media is played out. What is this approach called?
a. mixing up
b. sampling
c. interleaving
d. interpolating
interleaving
[Unit 11] . _______________ turn(s) the idea of traditional Web caching on its head. Instead of having clients look for a copy of the requested page in a nearby cache, it is the provider who places a copy of the page in a set of nodes at different locations and directs the client to use a nearby node as the server.
a. Content Delivery Networks
b. Novel Web Cashing
c. Web proxies
d. Web node distribution
Content Delivery Networks
[Unit 11]. The basic idea of a __________________ file-sharing network is that many computers come together and pool their resources to form a content distribution system. The computers are often simply home computers. They do not need to be machines in Internet data centers. The computers are called peers because each one can alternately act as a client to another peer, fetching its content, and as a server, providing content to other peers.
a. BitTorrent
b. peers
c. peer-to-peer
d. multipeers
peer-to-peer
