Video coding standard adopted by vcd

This article mainly introduces the video coding standards adopted by vcd, which has certain reference value. Interested friends can refer to it. I hope you will have a lot of gains after reading this article. Let Xiaobian take you to understand it together.

The video coding standard adopted by VCD is MPEG-1. MPEG-1 is a video and audio compression format customized for CD media, mainly used in VCDs. MPEG-1's output quality is about the same as that of a traditional VCR, which may be the reason why Video CD has not been successful in developed countries.

The video coding standard adopted by VCD is MPEG-1.

At present, the compression coding standard of digital video stored on VCD is MPEG-1.

MPEG-1 is the first video and audio lossy compression standard established by MPEG organization. Video compression algorithms were defined in 1990. MPEG-1 was approved as an international standard in late 1992. MPEG-1 is a video and audio compression format customized for CD media. A 70-minute CD transfers at about 1.4 Mbps. MPEG-1 uses block-based motion compensation, discrete cosine transform (DCT), quantization and other technologies, and is optimized for 1.2 Mbps transmission rate. MPEG-1 was subsequently adopted by Video CD as the core technology. MPEG-1's output quality is about the same as that of a traditional VCR, which may be the reason why Video CD has not been successful in developed countries.

MPEG-1 is a video and audio compression format customized for CD media. The resolution of VCD is only about 352×240, and it uses a fixed bit rate (1.15Mbps). Therefore, when playing fast motion video, due to insufficient data amount, macro blocks cannot be fully adjusted during compression, resulting in blurred blocks on the video screen. Thus MPEG-1 output quality is approximately comparable to that of a traditional VCR, which may be the reason why Video CDs have not been successful in developed countries. MPEG-1 audio is divided into three generations, among which the most famous third generation protocol is called MPEG-1 Layer 3, MP3 for short, which has become a widely used audio compression technology. MPEG-1 audio technology maintains the same output quality between each generation, but the compression ratio is higher than that of the previous generation. The first generation protocol MP1 was applied to LD for recording digital audio and Philips 'DGC, while the second generation protocol MP2 was later applied to one of the audio layers of the European version of DVD.

MPEG-1 has the following characteristics:

random access

Flexible frame rate

Variable image size

I-frame, P-frame and B-frame are defined

Motion compensation can span multiple frames

Motion vectors with half-pixel precision

quantization matrix

GOF structure

slice structure

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