Cayin SMP-PRO4 Manual Pemutaran - Halaman 6

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CAYIN SMP Player Video Playback Guide

3. Compression Method (Codec)

Compression is a very complicated but key process for reducing the size of video data. From

early VCD (MPEG‐1) to DVD (MPEG‐2) and the latest blue‐ray disc (MPEG‐2 or H.264), video

compression technology is constantly developed to lower bit rate but at the same time

increase the overall quality.

The word codec is a combination of two words, coder decoder, which means an encoder will

convert the motion picture into a digital file and a decoder will then convert the digital file

back into motion pictures for playback.

Video compression technology usually applies the following methods to compress video data

and achieve the balance between file size and video quality: data compression algorithm, still

image compression method, and high similarity between still images in video frames. Most

early codec (or encoder) methods used CBR to compress data so the file size was bigger. Most

of the latest codec methods use VBR so the file size can be smaller.

CAYIN's SMP players support the following codec:



MPEG‐1/MPEG‐2: MPEG‐1 is widely applied in VCD, while MPEG‐2 is widely applied in

DVD and digital broadcasting. They are both mature technology.



MPEG‐4 ISO: Also called MPEG‐4 part 2 or MPEG‐4 ASP (advanced simple profile),

MPEG‐4 ISO is defined by the MPEG organization, which adds a new compression method

and principle. Many popular codecs, such as DivX or Xvid, are originated from MPEG‐4

ISO.



WMV/WMA: Created by Microsoft, WMV mainly uses VC‐1 algorithm, and WMA is the

audio codec format, which was developed simultaneously.



RAWDV: An uncompressed codec that is used for early DV Camcorder, the file size is huge

and is seldom used now.



H.264: Also called MPEG‐4 part 10, AVC (advanced video coding) or MPEG‐4 AVC, this

codec standard was created by the MPEG organization and ITU‐T and is widely used to

process several high‐definition or streaming contents.



MPEG‐Audio: Also called MP3, this audio codec was established by the MPEG

organization and is widely used to incorporate with video files, as well as a popular codec

format for MP3 players now.



PCM or LPCM: PCM and LPCM are both used to digitize and store audio data. They both

can quantize and save uncompressed analog audio files. Since the data size of audio is

relatively smaller than that of video, occasionally video files will be stored in audio files

through this uncompressed format.

Comparison for system resource consumption: