The older version is Analog Video.
2. Describe the difference between the two formats.
The difference between the two is that Analog signals are made up of continuously varying waveforms, the value of the signal, at any given time, can be anywhere in the range between the minimum and maximum allowed. Digital signals, by contrast, are transmitted only as precise points selected at intervals on the curve.
3. What are some advantages of digital video?
There are many advantages of using digital video to create a vido production compared to analog video. Using analog video was like typing up a letter with a typewritter. If you wished to insert a video at the beginning of a production you had to start from scratch.
Digital video can be enables your work to be edited and re-edited until you think its just right. This includes being able to add music, titles and special effects.
4. What is meant by frame rate in video?
When a series of sequential pictures are moving rapidly enough, instead of seeing each individual image, we percieve a smoothly moving animation. Frame rate is how many images are seen per second.
For example, it takes a frame rate of about 10 frames per second for us to perceive smooth motion.
Below that speed, we can notice jerkiness.
Higher frame rates make for smoother playback.
The movies you see in a theatreare filmed and projected at a rate of 24 frames per second.
The movies you see on television are projected at about 30 frames per second, depending on the country in which you live and the
video standard in use there.
5. Do all applications use the same frame rate? Explain your answer.
No, the frame rate used is dependant on what you aim to create. A simple anbimation should go at least 10-15 frames per second. A film should go at a rate of 24 frames per second, and depending on your country,the programmes and movies you see on television move at 30 frames per second.
6. What is meant by resolution, how is it measured.
The amount of information in each frame is known as the resolution of the image. Resolution is normally represented by the number of individual pixels that are on the screen, and is expressed as a number of horizontal pixels times the number of vertical pixels.
An example is 640x480 or 720x480.
All other things being equal, a higher resolution will result in a better quality image.
7. What is the colour system called RGB?
RGB stands for Red, Green, Blue.
8. Explain the video standards PAL, NTSC, and SECAM, what are the main differences between them.
These video standards are the television standards which are used globally, but each are used in different countries.
The main differences are that NTSC uses only 525 horizontal lines and runs 29.97 frames per second where as PAL and SECAM use 625 horizontal lines and only run 25 frames per second.
9. Which standard do we use in Australia?
In Australia, the PAL standard is used.
10. For what type of video camera would you need to have a Video Capture Card in your computer to download video?
You would need a video capture card for Analog cameras so that the film can be "digitized".
11. Why don’t we need a video capture card for the video we will be doing at school?
We will not need a video capture card because we will be using digital cameras.
12. What is an IEEE 1394 port?
13. Why do digital cameras use video compression?
Digital cameras use video compression because if it didn't, then the uncompressed video would take a much larger amount of space to store in. This could result in a video only 1 minute long being 1.5 GB which is immensley huge.
14. Describe what a codec is.
15. What is meant by generation loss? Where does it happen?
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