5 - Tang Hin
Video
Activity 1
2. Jurassic25.avi is the smoothest. Jurassic1.avi is the jerkiest.
Activity 2
3. USJ450K.rm has the best quality.
4. USJ450K.rm is the largest.
USJ20K.rm is the smallest.
Concept Map
1. C
2. F
3. B
4. E
5. H
6. A
7. G
8. D
Concept Checker
1. F
2. T
3. T
4. F
5. F
Multiple Choice Questions
1. B
2. C
3. B
4. C
5. A
6. D
7. A
8. D
9. B
10. D
11. C
12. B
Short Questions
1. (a) The aspect ratio of the video is different from that of the LCD TV.
Aspect ratio of the video = [pic]
Common aspect ratio of LCD TVs = 16：9 ( 1.78 (1)
(b) The frame rate of the higher-resolution video (10 fps) is lower than that of
the lower-resolution video (15 fps). (2)
(c) The number of still images produced = 2 × 6 = 12 (1)
2. (a) (i) Kilobit per second (1)
(ii) 1,000 bits (1)
(b) Length of video = [pic]
= [pic]s (1)
( 687,195 s
( 190.9 hr > 150 hr (1)
Therefore, 150 hours of video (with 1,5 Mbps bit rate) can be stored.
(c) Some storage space must be reserved for the system software of the player.
(2)
3. (a) The recorded video on a DVD can be directly played using a DVD player or
a computer with a DVD drive. (1) The recorded videos are organized into
chapters on a DVD. Users can search any video clip on the disc by random
access. This is more convenient than searching on tapes by sequential
access. (1)
(b) (i) Recorded videos on a DVD＋RW or a DVD－RW can be erased and the
disc can be reused. (1)
(ii) A DVD＋RW need not be finalized before it can be played directly in a
DVD player or a DVD drive. (1)
(c) No disc is necessary for recording as the videos are directly stored in the hard
disc. / The video files can be transferred directly to the computer for viewing.
(any one × 2)
4. (a) 53 Mbps × (3.2 × 60) seconds = 1,272 MB (1)
(b) (i) Compressor-decompressor / Coder-decoder (any one × 1)
(ii) MPEG-1 / MPEG-2 / MPEG-4 / DivX / WMV / RealVideo
(any one × 1)
(c) As the bit rate of a video clip increase, both video quality (1) and video size
will increase. (1)
(d) The video will become jerky (not smooth) when it plays. (1)
(e) Video streaming is the method of delivering video data so that users can
download and play the video at the same time. (1)
Its advantage is that users do not need to wait for the complete download of a
video before it starts playing. (1)
Long Questions
1. (a) The quality of digitized video does not degrade over time. / Digitized video
clips can be organized in folders under different categories for easy
searching. / Digitized video clips can be duplicated and distributed to
students easily. (any two × 2)
(b) (i) Frame size / resolution; (1) colour depth; (1) frame rate; (1) codec /
compression size format / bit rate (1)
(ii) The length of video = [pic]s (2)
( 335.5 s
( 5.59 minutes (1)
(c) Video streaming (1)
(d) There is no appropriate codec installed in the computer. (2)
(e) Distribute the video clips using recordable CDs or DVDs. (1)
2. (a) Digital video camera; (1) video capture card (1)
(b) Technology: video streaming / video multicasting / video broadcasting
(any one × 1)
File format: Windows media Video / RealMedia / QuickTime / MPEG-4 /
FlashVideo (any one × 1)
(c) (i) Multiple video sources from different cameras shooting at different
angles (1) can be displayed within one single screen at the same time. (1)
(ii) Subtitles help describe and explain the content of the video (such as the
name and title of a guest speaker) (1) in case the content cannot be
listened clearly in a noisy classroom. (1)
(iii) With transitions, video scenes can be linked in a more attractive way. (2)
(d) Capturing, processing and broadcasting quality real-time video requires large
computing power. (1)
(e) Students who are not able to attend the school activity on that day can still
watch the live broadcast (or video replay) on the Internet. (2)
(f) AVI video files occupy large storage space (1) and streaming is not
supported. (1)
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.