Digital VideoDigital Video

Lesson ObjectivesLesson Objectives

After completing this lesson, you will be able to:

Identify the characteristics of digital video.

Explain what digital video editing is and the various output formats for digital video.

Identify the features of different Web video technologies.

Characteristics of Digital VideoCharacteristics of Digital Video

One of the important characteristics of digital videos is that you can edit them easily on a computer by using digital video editing software. For example, you can:

edit videos to include titles, add a sound track, or add special effects. upload the video to a Web site and share it over the Internet. copy the video from a computer to a recordable CD or DVD.

Another characteristic of digital videos is that they can be compressed.

Types of CamcordersTypes of Camcorders

1. Analog Camcorder

2. Digital Camcorder

Types of CamcordersTypes of CamcordersAnalog CamcorderAnalog Camcorder

An analog camcorder records and stores video in an analog format on a tape.

To edit the video on a computer, you need to convert it from the analog format to the digital format.

A digital camcorder records and stores video in a digital format.

An advantage of using the digital camcorder is that the recorded video is easy to edit because it is stored in a digital format.

Another advantage is that a digital camcorder is generally lighter and smaller than an analog camcorder.

Types of CamcordersTypes of CamcordersDigital CamcorderDigital Camcorder

Digital Video EditingDigital Video Editing

Using digital video editing software, you can:

Add titles and background music to your video to make it more appealing.

Cut or remove certain scenes from the video.

Add special effects, such as fade-in and fade-out, to the video.

Enhance video quality by adjusting its brightness, contrast, and color.

Record audio over the video to describe certain scenes.

Digital video editing can either be linear or nonlinear:

Linear editing - you have to sequentially traverse a file to edit the file.

Nonlinear editing - You can directly go to the frame and remove it from your video.

Digital Video EditingDigital Video Editing

After you edit a video, you can store it in various formats:

You can use software to capture a frame from a movie and save it as a still image.

You can also edit the video and save it as a video clip in the Windows Media Video (WMV) format.

You can also share the video clip with your friends by uploading it to a Web site or sending it by e-mail.

You can save the edited video clips and still images in a format that can be copied to a recordable DVD or Video CD (VCD).

Digital Video Digital Video Output Formats Output Formats

Web Video Technologies Web Video Technologies Video StreamingVideo Streaming

Video streaming allows you to view video files over the Internet without downloading them.

In this case, the video file is sent to your computer in a continuous stream.

You need a streaming video player to view the video file over the Internet.

You might need to download a streaming video player and install it on your computer before you can play the video files.

In real-time video streaming: you can view a live event over the Internet. a camera is used to capture the live event. a converter is used to convert the video into the video

streaming format so that the video can be broadcast over the Internet.

In on-demand video streaming: a video is taken from a storage device, such as a CD or

DVD, and converted into a streaming video format. This video is then distributed over the Internet.

Web Video Technologies Web Video Technologies Two Types of Video StreamingTwo Types of Video Streaming

Downloading Video Downloading Video

You can also download video files, such as video clips or video presentations, from the Internet.

Sometimes, when you are downloading a file, you can play

the file after a major portion of the file is downloaded, but usually you need to wait until the entire file is saved on your computer.

Web Conferencing Web Conferencing

Web Conferencing allows you to:

hold a virtual conference where you can see and hear others in real time.

use tools such as virtual whiteboards and slide presentations during the conference.

Can do screen sharing, where the participants can see what is on the presenter’s desktop.

voice communication between the participants so that they can share their views and discuss their opinions.

use text chatting if voice communication is not possible.

QuestionsQuestions