I noticed that a certain video had several ‘versions’ and all of them were the same 1080p resolution, but they all differed in sizes. Some versions differed by a few MB, but it could range from around 300 MB to more than 1.5 GB! All of them have the same length and resolution and are exactly the same video. Also, a 720p version of that video was twice the size of some of the 1080p versions despite it being the same video.
I noticed something similar in some other videos as well. They all have the same length and resolution, and are even the same video, but their sizes differ by several times. Why is that the case?
In: Technology
Raw video takes up crazy amounts of space. Let’s take an example of 1080p60:
1920 x 1080 pixels x 3 subpixels x 8 bits per subpixel x 60 fps = 3 gigabits per second ≈ 370 MB/s. Quadruple that for 4k60, and add another 25% for 10-bit video.
Hence, we need compression to get manageable file sizes. The other responses address that nicely.
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