Audio and video series one: basics

Opening: 5 g era has been open, audio and video industry will have a qualitative leap, as the development of intellectual property and copyright protection of digital technology, digital audio and video will achieve explosive growth, the future will form a global ecological audio and video services, due to various aspects need the knowledge of the audio and video, and decided to open a pit of the audio and video series, and then a period a period to fill slowly.

1. Concept of audio and video recording

Second, audio and video playback principle

Third, the image represents the concept

1. RGB format

2, YUV format

Y ‘uv was invented because of the transition between color television and black and white television. Black and white video only has Y (Luma, Luminance) video, which is the gray scale value. When it comes to the development of color TV specifications, color TV images are processed in YUV/YIQ format, and UV is regarded as Chrominance or Chroma. If the C signal is ignored, the remaining Y (LUMA) signal is the same as the previous black and white video number. In this way, the compatibility problem between color TV and black and white TV is solved. The biggest advantage of Y’UV is that it only takes up a small amount of bandwidth, because the human eye is sensitive to brightness and insensitive to chromaticity, thus reducing the amount of data in part of the UV, but the human eye cannot perceive it.

YUV also known as YCbcr, for each component as follows:

Y: Luminance. In addition to the brightness signal, it also contains more green channel quantity.
U: CB, the difference between the blue channel and the brightness.
V: Cr, the difference between the red channel and the brightness.