media compression

 

For this week’s blog, I have been asked to different watch videos on media compression and to share my experience and what information I have learned from these videos.

Media compression can be done to videos or images, it is the process of making a file smaller without removing any of the content, This is done by removing unimportant information within the file, so it can be compressed.

There are only 4 different ways that the data size in a video and photo can be compressed. The first way would be by lowering the frames per second (FPS) in a video, for example, let’s say for every minute of video you record is at 60 FPS, that means every minute has 60 pictures within it and by lowering that to 30 FPS you could cut down on the file size with a noticeable difference, but this can only be done so much before it becomes noticeable. From the video showing examples of different frame rates is seems that anything below 30 FPS looked choppy and unrealistic, most games nowadays run at 60-30 FPS while movies are usually shot in 24 FPS

The second way is by adjusting what colours are in the image, removing certain colours in an image can lower the file size.

The third way is by using inter-frame compression looks at each frame and automatically removes information that is duplicated across multiple frames. An example of a program that can do this handbrake.

The fourth form of compression is changing the sound by levelling out the audio and removing high and low frequencies that are not noticeable to the human ear, this can lower the file size.

There are many reasons for media compression, one reason is if you must upload large images or long videos that you can’t make smaller or shorted data compression allows changing the file size without making noticeable changes. Some websites have an upload limit only allowing you to post pictures or videos under a certain file size, this is another example of when data compression can be useful

After watching these videos, I have a better understanding of video compression. Before watching the videos and starting this blog post I knew a bit about image and video compression from doing graphic design work and editing videos and I had watched a great video on YouTube that explained how bit rate worked which I have linked below.

https://www.youtube.com/watch?v=r6Rp-uo6HmI




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