Canon XL 1, Руководство пользователя, Страница: 18 / 25

5. S-video cable – aka YC cable
- calculates values/changes by different algorithm
- between composite and component
- inside camera kit
- cleaner than composite
- video only
PATHWAYS: Composite – noisy, slow, analogue, only takes video information
Component – only video, no audio capacity
6. 9 pin Remote cable – allows to stop/start/record/eject
- no audio or video
- aka RSS control cable protocol
7. XLR (audio) – 3 plugs: i. neutral
ii. left
iii. right
- can take stereo
- audio only
8. Jack cable – stereo – indicated by black rings (on top and middle)
9. Network cable – telecommunications plug
Types of compression:
Video codecs can use spatial compression, temporal compression, or a combination of
both.
1. Spatial compression, affects only a single frame at a time. This type of compression
makes random access to any point in the video and editing easy. Spatial compression
finds redundancy within a frame—either in areas of flat or similar colours, or areas of
a frame that look like other areas of the frame—and saves space by encoding these
similar areas by reference, rather than by a literal description of colour attributes for
each and every pixel.
2. Temporal compression, adds the ability to use other frames as a reference for the
current frame. In video, each frame tends to be similar to the frame preceding it.
Temporal compression encodes only the changes from one frame to another (with the
exception of key frames, as described below, which contain a complete representation
of the data in a frame, without reference to previous frames).
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Codecs/ Compression