MS TUTE 05

BSc (Hones) in Information Technology Specialized in Interactive Media

Batch 2016

Multimedia Systems

Tute 5

R.A.P.C.P  RANASINGHE

IT14115394

1.                 List the steps involved in capturing video, compressing the video, and preparing it for DVD. Briefly discuss the decisions you need to make with each step regarding compromises on image quality and other limiting factors.

First of all to capture video, need a Camera. There are few things to consider before capturing a video.

·         Quality

·         Playback Time

·         Video Resolution

You need to consider about the recording time and playback time according to the audience. And the quality depends on the purpose of your video. Mobile device it’s not required more quality, but it also depend on audience. If video resolution is poor no one will watch these days. However both this Quality & Video Resolution depends on the media that is going to share. If it is share through web, video must be medium quality and the file size should be low. This is compulsory.

We can’t prepare DVD with the rough video footage. It should be edited and compress to run in all devices. To do that now required software. When you have edited it in software like Premier Pro you must export and use settings that will give you a good resolution and a small file size.

2.                 Discuss how the computer monitor image differs from a television image. List the limitations in creating images on the computer destined for a television screen.

Both Television and Monitor looks like same, physically both work as same. But these two works differently in inside. Generally Television are used to watch Over the Air Broadcast. But Monitors not. Monitors designed specially to works with Computer. But someone will tell “there’s no different between television and Monitor”

When we watch a video in a TV & Monitor within same size as resolution. Oft-time TV will get the place, but it’s not. TVs are designed to get the attraction with another model. Manufactures cheating in human illusion. They done different things to get vivid colors in a TV. But in a Monitor this isn’t done that much. That’s why Monitor have more settings than TV. We can collaborate our monitor. Most HDTVs are 16:9 ratio but most Wide Monitors are 16:10. These is because monitor is used to work near, but TVs are watched from far away at least 5m. Most important thing is computer graphic card will not always compatible with the TV, but Monitor can as I mentioned before Monitors designed to computers. When TV is used to work as monitor we can see each and every pixel but monitor we can’t see in our naked eye.

Limitations

·         Color Palates

·         Pixel size are defer (1x Monitor / 1.06x TV)

·         Resolution

3.                 Discuss several considerations in shooting and editing video for multimedia. What techniques would you use to produce the best possible video, at a reasonable cost? Which of these techniques apply to all video, and which apply specifically to multimedia?

Before start shooting a video, need to come up with a storyboard and script. You should come up with a camera that is technically changeable settings. To editing purpose you need a computer with higher performance to run the application smoothly.

            To produce a best video these techniques should follow.

·         Concept/purpose of video

·         Script

·         Lighting

·         sound

·         Composition

·         postproduction

·         Basic Video rules (180^o plane)

·         Storyboard

4.                 Define codec and list an example of a codec.

Codec stands for Compressor and Decompress. Codecs can be implemented in software, hardware or combination of both. Codec is a technology for compressing and decompressing data. Codecs main benefit is reduce file size and decompress when it need.

MUSIC CODECS                           MOVIE/VIDEO CODECS

 MP3                                      MPEG-1        H.264

 AAC                                      MPEG-2        H.265 (HEVC)

MPEG-4

                                               

5.                 What is “Chroma Keys”? Explain the importance and the different techniques.

Chroma Key or Green Screen is a techniques for layering two video/Image together and create a production. This has been used in remove a background from the video and add separate background to the video. Most of the Hollywood Movies use this techniques to add special effects and compose their production.

Green Screen & Blue Screen

Both of this is used to create special effects and remove background or elements of the video. The most important factor for a key is the color separation of the background and foreground.

When using Blue screen their few drawbacks.

1)     Jeans are blue and the screen also blue, it’s hard to separate both these same color areas.

2)     The camera not more sensitive to blue color and as a result of this cannot separate background and foreground easily.

Benefits of using Green Screen

1)     Image sensors are more sensitive to green, there for green channel contains least noise

2)     Less light is needed to illuminate green.

Major Factors

1)     Lighting

2)     Programing

3)     clothing

4)     Exposure

5)     background