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1. Theory Fundamentals
A section of Computer Science, 9608
Listing 10 of 304 questions
A student is creating a short video and needs to record music to play in the background. The student uses a microphone to capture the music. Explain how the microphone captures the music. An analogue-to-digital converter uses sampling to encode the sound. Explain how different sampling resolutions affect the sound file and the sound it represents. The student needs to edit the sound file. Describe two features of sound editing software that can be used to edit the sound file. Feature 1 Feature 2 The video is recorded with a frame rate of 60 frames per second and uses progressive encoding. Describe what is meant by a frame rate of 60 fps. Describe what is meant by progressive encoding in video recording. MP4 multimedia container format is used to save the video. State what is meant by multimedia container format.
9608_w18_qp_11
THEORY
2018
Paper 1, Variant 1
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Oscar is watching a concert on his laptop computer. The concert is streamed to his computer at the same time as it is taking place. Identify whether Oscar is using real-time or on-demand bit streaming. Justify your choice. Streaming method Justification The video of the concert repeatedly stops and restarts while Oscar is watching it on his laptop computer. His friend is watching the same video of the concert at the same time, in a different location, but he does not experience the same problem as Oscar. Give three possible reasons why Oscar’s video constantly stops and starts again. The video of the concert is made up of a sound track and multiple images. Two successive frames of one section of the video are shown. The pixel colours are represented by letters. BL BL BL RD RD RD BL BL BL RD RD RD K K K K K K BL BL BL RD RD RD LG LG LG DG DG DG LG LG LG DG DG DG Y Y K Y Y K BK BK BK BK BK BK W K W W W DG W K W W W DG P P P P P P P P P P P P Frame 1 Frame 2 Explain the way in which progressive encoding can be used to transmit Frames 1 and 2. Explain, using Frames 1 and 2 as an example, the way in which temporal redundancy can be used to compress a video. Give another type of redundancy technique that can be used to compress a video. MP4, WMV and AVI are all examples of a type of format that combines sound and image components into a video. Identify the type of format that combines the sound and image components into a video.
9608_w20_qp_11
THEORY
2020
Paper 1, Variant 1
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When recording a video, state what is meant by frame rate. Video streaming can use either interlaced encoding or progressive encoding. Describe what is meant by the following terms. Interlaced encoding Progressive encoding Name the video terms described below: Description Term Pixels in two video frames have the same value in the same location. There is duplication of data between frames. A sequence of pixels in a single video frame have the same value. Give one file technique that could be applied when either of the two features, described in part , are present.
9608_w16_qp_12
THEORY
2016
Paper 1, Variant 2
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Questions Discovered
304