Information Technology • Sound and Video Editing

Edit Suite

Programme monitor

00:00.0
0−6−12−24dBFS CLIP

Checklist

    Timeline

    Click a clip to choose it. Drag its ends to trim it.
    V1A1A2

    Edit Suite — Explanation

    How to use it. Edit is a timeline with one video track (V1) and two audio tracks (A1, A2). Click a clip to choose it; drag its ends to trim it, and drag an audio clip to move it. The panel on the right splits it at the playhead, deletes it, adds fades, a transition into the next clip, or changes its level. Play it and watch the level meter. The checklist gives you jobs to do. Export shows how the settings change the file size and the quality. Challenges has questions, including file-size calculations. All the video and sound here are made by the page itself.

    Editing.

    Export settings and file size (uncompressed), the same formulas as File Sizes:

    Common exam mistakes: forgetting to multiply by the number of channels or by the frame rate; forgetting to divide by 8; minutes left as minutes instead of seconds; saying lossy compression can be undone; mixing up trimming (removing from the ends) and splitting (cutting in two); thinking turning the volume up always helps (above 0 dBFS it clips).

    Objective: Cambridge International AS Level IT (9626), sound and video editing: trimming, splitting and joining clips, transitions, fades, audio levels; and how sample rate, sample resolution, mono and stereo, resolution, frame rate and lossy or lossless compression affect file size and quality.

    Where this fits

    • AQA: AQA A Level Computer Science (7517) Goes beyond AQA A Level Computer Science (7517): Video editing (trimming, transitions, audio levels) goes beyond AQA 7517; sound sampling and compression are in it.
    • Cambridge: Cambridge IGCSE Computer Science (0478); Cambridge A Level Computer Science (9618); Cambridge AS Level Computer Science (9618); Cambridge A Level Information Technology (9626); Cambridge AS Level Information Technology (9626) Goes beyond Cambridge IGCSE Computer Science (0478): Video editing (trimming, transitions, audio levels) goes beyond 0478; sound file sizes and compression are in it. Goes beyond Cambridge A Level Computer Science (9618): Video editing (trimming, transitions, audio levels) goes beyond 9618; sound file sizes and compression are in it. Goes beyond Cambridge AS Level Computer Science (9618): Video editing (trimming, transitions, audio levels) goes beyond 9618; sound file sizes and compression are in it.
    • IB: IB Computer Science HL; IB Computer Science SL Goes beyond IB Computer Science HL: Video editing (trimming, transitions, audio levels) goes beyond IB CS; audio and video data and compression are in it. Goes beyond IB Computer Science SL: Video editing (trimming, transitions, audio levels) goes beyond IB CS; audio and video data and compression are in it.
    • NCEA Level 2 Digital Technologies: 91893 Use advanced techniques to develop a digital media outcome; 91893 Use advanced techniques to develop a digital media outcome
    • Pearson Edexcel International: Edexcel International GCSE Computer Science (4CP0) Goes beyond Edexcel International GCSE Computer Science (4CP0): Video editing (trimming, transitions, audio levels) goes beyond 4CP0; sound file sizes and compression are in it.

    Edit Suite — Key Terms

    Key concepts in English, with te reo Māori, Chinese (Simplified) and Korean.

    EnglishTe reo Māori中文（简体）한국어What it means on this page
    Trimno attested term修剪트리밍To remove unwanted material from the start or end of a clip, by moving its in or out point.
    Splitno attested term分割분할To cut a clip into two at the playhead, so that part of it can be removed or moved.
    Transitionno attested term转场트랜지션(전환 효과)An effect that joins two clips, such as a cut, a cross-dissolve, a fade through black or a wipe.
    Fadeno attested term淡入淡出페이드Bringing a clip gradually up from, or down to, silence or black: a fade in or a fade out.
    Clippingno attested term削波클리핑Distortion when sound is louder than the loudest level a digital file can hold (0 dBFS), so the tops of the wave are cut off flat.
    Monono attested term单声道모노Sound recorded or played on one channel.
    Stereono attested term立体声스테레오Sound on two channels, left and right: twice the data of mono.
    Sample rateno attested term采样率샘플링 레이트(표본화율)How many samples are taken each second, in hertz (Hz).
    Sample resolution (bit depth)no attested term采样精度（位深度）샘플 해상도(비트 심도)The number of bits for each sample; it sets how many levels are possible.
    Frame Rateno attested term帧率프레임 레이트The number of frames each second of video. Uncompressed, the file size grows in step with it.
    File sizeno attested term文件大小파일 크기How much storage a file needs. Uncompressed sound: sample rate × bit depth × channels × seconds; video: width × height × colour depth × frame rate × seconds.
    Lossless Compressionno attested term无损压缩무손실 압축A data compression method where the original data can be perfectly reconstructed without losing any quality.
    Lossy Compressionno attested term有损压缩손실 압축Compression that permanently removes detail people are unlikely to notice, for a much smaller file (MP3, AAC, JPEG, H.264).
    Bit Rateno attested term比特率비트 전송률The number of bits used for each second of sound or video; a lossy file's size is bit rate × seconds.

    On the te reo Māori column. Terms marked as gaps have no attested equivalent in the sources checked — Karaitiana Taiuru's Dictionary of Māori Computer and Social Media Terms, Paekupu, the Reserve Bank's te reo financial glossary, NZQA and Te Aka. No coinage is printed as though it were established; where a class needs one, commission it from Te Taura Whiri i te Reo Māori and credit the translator. Te reo Māori is not italicised and takes no plural "s".