Media Compression

This week for the video task, I had to watch a few videos on media compression. I’m going to review these videos and share my thoughts on them and describe what media compression is in my own words. 



Source




Video 1- Video Compression as Fast as Possible 
The first video that I watched was a video going into detail on what video compression is. Video streaming websites like Netflix, Hulu and YouTube use video compression. If there weren’t any video compression at all on these sites, then you would not be able to stream videos in a high-quality state. There are two known ways to compress video they are known as:

  • Spatial Compression or intraframe uses a .jpeg format and is only used on an individual video frame. This process can be used on a jpeg image; jpeg stands for Joint Photographic Experts Group. When a jpeg is created, the colour information is reduced in a known process called Chroma Subsampling which then the image is then split into sections of 8x8 pixels that are known as Macroblocks which is then to reduce the file size.
  • Temporal Compression or known as interframe, uses a .mpeg format and reduces redundancy. The term redundancy is primarily used for Temporal Compression for the video that I had watched. In this explanation, the first video describes it by having the entire frame in white, which means that the video frames used in the video that I have watched are entirely the same, which is known as redundancy which can easily be compressed. The MPEG format can break a video frame down into a 8x8 Macroblock which receives instructions on what to do with the pixels that are there. These instructions mainly are staying the same, changing colour, and rotating.  
Finally there is another thing called Bitrate. Bitrate mainly is the amount of data and bits that can be used in every second. For example, if a video has a shallow rate of Bitrate in it, it will be a low rate resolution with a lot of compression going on in the video itself.  If a video has a higher rate of Bitrate in it, it will have a high-quality resolution in the video itself. To sum it all up, the more bits you have in the video, the better it will work, and if you have more minor bits in your video, the less quality it will have. 

Video 2 Computer Skills Course: Bits, Bytes, Kilobytes, Megabytes, Gigabytes Terabytes 
For video two, it is an explanation of what digital storage is and how it works. Digital repository is made up of binary where everything is saved as ones and zeros. To describe these and zeros, they are known as a Bit which is a binary digit. The ones and zeros used in binary are used to store information from digital photos, text files and the sounds that come from your computer. If you take eight bits of the ones and zeros in binary and put them together, it forms 1Byte; if you were to increase the 1 Byte to a 1,000 Bytes it would then include the following: 

  • 1,000 Bytes =1 Kilobyte KB, which has enough space for 1/3 page of text and a medium storage floppy disk, which back in 1978 could hold up to 360 kilobytes of information. 
  • 1,000 Kilobytes =1 Megabyte MB, which has enough storage for things like a single book, a photo and one minute of music. A half-inch of a megabyte could hold only 1.4 megabytes. 
  • 1,000 megabytes =1 Gigabyte GB has enough storage for 1,000 books, 1,000 photos and 16 hours of music. 
  • 1,000 Gigabytes =1 Terabyte TB can contain a million books, a million photos and over two years of continuous music.  

My thoughts 

I was surprised by the number of steps that went into video compression I didn’t know that there were many steps involved in the making of the video process. But I’m glad that I’ve seen it so that I will know in the future when i am making a video or capturing images so that i can compress either one of them. As for the video 2 i pretty much knew that already, i know all about kilobytes mainly because the devices that i have for example my phone, PlayStation and iPad Pro all have gigabyte storage inside them. Overall i liked the videos very good information especially for video 2 with hand drawn animation that it had going i like that its very creative. 


References 








 

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