Intoduction to video

1. The video format we will be using this term is Digital Video, what is the other, older format that was used recently.


 Analog Video.



2. Describe the difference between the two formats.

Analog video is a video transmitted to an analog signal by the air or a cable. The value of the signal can, at any given time can, be anywhere between the minimum and maximum allowed. However, digital signals are transmitted as precise points.



3. What are some advantages of digital video

The advantages of digital video are that instead of losing its quality after being copied, it is a perfect copy, with the same quality. Also, it is easier to transfer a digital video than to import an analog video.



4. What is meant by frame rate in video

Frame rate refers to the number of images shown per second.



5. Do all applications use the same frame rate, explain your answer.

Not all applications use the same frame rate; it depends on the subject matter of the video. If the subject is moving quickly, more frames are needed per second to make a clear view of the subject.



6. What is meant by resolution, how is it measured.

Resolution is represented by the number of pixels that are shown on the screen. It is shown by the number of horizontal pixels times the number of vertical pixels.

7. What is the colour system called RGB

The system RGB stands for the red, green and blue aspects of a colour.



8. Explain the video standards PAL, NTSC, and SECAM, what are the main differences between them.

These three television standards are used around the world. PAL is used in Australia, China, South America and most of Europe and uses 25 frames per second and 625 horizontal lines. NTSC is used in USA, Canada, Japan, Korea and Mexico and uses the highest frame rate of 29.97 frames per second. However, it has the lowest resolution with 525 horizontal lines. SECAM is used in France, Middle East and much of Asia and is only used for broadcasting. It has a frame rate of 25 frames per second and 625 horizontal lines, as with PAL.

9. Which standard do we use in Australia?

PAL



10. For what type of video camera would you need to have a Video Capture Card in your computer to download video?

When using an analog video camera or other analog source material, the video needs to be changed to digital for a computer to be able to understand it so a video capture card is needed.



11. Why don’t we need a video capture card for the video we will be doing at school.

The type of camera is digital so a video capture card isn’t needed as it is already a digital video.



12. What is an IEEE 1394 port?

Enables the transfer of a digital video to a computer.



13. Why do digital video cameras use video compression

Digital video uses compression to be able to save time and space. The amount of time it takes for a video to transfer from the internet to a computer or even from a hard drive to be viewed on a computer is lengthened with the size of the file. If the file is too big, it’ll take a very long time to load. Also, the amount of space taken up by the file can limit the amount of files able to be placed on the device.



14. Describe what a codec is.

A codec is a device found in hardware that deals with the compression and decompression of files.



15. What is meant by generation loss, where does it happen?

Generation loss is the data lost from a video. This happens when an analog video is copied