By PURPLELEC | 06 June 2023 | 0 Comments
What is a Video Codec?
There are a lot of video devices now, such as video capture cards, video converters, video switchers, video cameras, video distributors, etc., which are often used in video capture projects. , TV output video signal, etc. output video data or video and audio mixed data input to the computer, and converted into digital data that can be identified by the computer, stored in the computer, and become an editable video data file.
So what is a video encoder?
High-definition video files are digital video and audio signals compressed and woven together in a certain format through an encoder. A decoder is a hardware/software device that converts an encoded video file into a digital signal format. Such as mpeg4 for video, mp3, ac3, dts for audio, etc. These encoders can compress and store the original data. They are all commonly used encoding formats just now, and there are also some professional encoding formats, which are basically not used by ordinary families.
In order to play back these videos and audios on home devices or computers, decoding software is required, generally called plug-ins. Such as mpeg4 decoding plug-in ffdshow, ac3 decoding plug-in ac3fliter, etc. These images and sounds can only be played back on your computer with various decoding plug-ins installed.
The video encoder and the video capture card have many functions the same, and the main function of the decoder is to compress and decompress the video signal. The computer industry defines true color through a 24-bit measurement system, which defines millions of colors, close to the limits of human vision. Now, the most basic VGA display has 640×480 pixels. This means that if the video needs to play at 30 frames per second, up to 27MB of information is transferred per second.
At such a speed, a hard disk with a capacity of 1GB can only store about 37 seconds of video information. Therefore, the information must be compressed. By discarding some digital information or selecting visual information that is easily overlooked by our eyes and brains, the hard disk capacity consumed by video is reduced. This video compression process is the codec. The compression rate of the codec ranges from the general 2:1 to 100:1, making it possible to process a large amount of video data.
In video multimedia applications, if it is used in digital multimedia, the decoder includes video decoder and audio decoder. The image and sound of digital media use special software encoding formats, such as video mpeg4, audio mp3, ac3 , dts, etc. These encoders can compress and store the original data. They are commonly used encoding formats just now, and there are also some professional encoding formats, which are basically not used by ordinary families. In order to play back these videos and audios on home devices or computers, decoding software, generally called plug-ins, is required. Such as mpeg4 decoding plug-in ffdshow, ac3 decoding plug-in ac3fliter, etc. These images and sounds can only be played back on your computer with various decoding plug-ins installed.
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