Editing Quiz
Aspect ratio is the width in relation to the height of a
video. 16:9 is the aspect ratio generally found on newer wide screen televisions.
Whereas the ratio found on older standard TV’s tends to be 4:3 and on movie screens
the ratio is even higher.
Video sizes vary depending on quality of video. The pixel counts
of HD videos are normally 1280x720. A 1080p video has a video frame size of
1920x1080 which is the Blu-ray standard.
The frame rate of a video file which is 720:50p would be 50.
The ‘p’ tells you how the frames are shown. The ‘p’ stands for progressive scan
which shows every frame one after another. Whereas ‘I’ or interlaced scan shows
half of the frame at one time and half at another, and interlaces them together
so that we see fluid movement. P creates
better quality but obviously means that it makes files which are much bigger.
Real film is shot at a frame rate of 24fps, the higher the
frame rate the smoother the action is.
The word ‘lossy’ is used to describe highly compressed
files.
Three types of files commonly used in video editing are
AVCHD. AVCHD is a domestic camcorder file. It is a highly compressed type o
file. MOV is a type of file found on Apple QuickTime. This is also compressed.
FLV and F4V are flash video files. Flash is commonly used on the web; these
files are also ‘lossy’ and compressed.
A codec is how the video and audio are compressed to get
inside a file, and then decompressed to make it read it again. Codec means
coding and decoding.
A bitrate is the speed at which a file processes
information. The higher the bitrate the more powerful and better computer you
need.




