Suppose you are considering the best way to present a round-table discussion of students discussing their reasons for choosing their majors. You know that your users are accessing the Web using a 56Kbps modem. You are considering the following possibilities:
i. Four images each having a resolution of 400x600 and a file size of 250 KB each plus four audio clips that are 160 KB each. Each audio file is 20 seconds long.
ii. Four video clips having a resolution of 160x120 and a file size of 375 KB
Answer the following questions:
a. For each of these possibilities, what is the overall download time? Since your users are accessing the Web with a 56Kbps modem, use the estimate of 3 minutes per megabyte.
b. What is the difference in download times? Give the answer in minutes. Which possibility has the faster download time?
c. It’s always important to consider download time when choosing a multimedia presentation. In this case, it’s probably better to choose the possibility that has the slower download time. Why?
a. For scenario 1, there are four images at 250 KB, each which is 1MB, plus four audio clips at 160KB, which is 640 KB. Together this is 1.64 MB. The approximate wait time is 1.64 MB * 3 minutes/ MB = 4.92 minutes. For scenario 2, there are four video clips of 375 KB, each which is 1.5 MB. The approximate wait time is 1.5 MB * 3 minutes/MB = 4.5 minutes
b. Scenario 1 has a download time of 4.92 minutes, or close to 5 minutes. Scenario 2 has download time of 4.5 minutes or 4 minutes, 30 seconds. The video option is actually faster by 30 seconds.
c. Currently technology can download and play audio files in real time, so a user doesn’t have to endure pauses and gaps while waiting for additional data to download. Unfortunately, the same is not true for video. Most likely, even though the download time is a little slower, the approach of using a picture plus audio is still work looking at carefully. In practice, 400x600 image files can probably be compressed to be significantly less than 250KB, so from this perspective, it’s also work reviewing the audio option.
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