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
Tbh im not sure about the technical details (someone else can answer that) is but it boils down to bitrate. It refers to amount of data processed per second by the video playback system. Download the tool media info or examine the properties of the different video files. You’ll likely see that the largest files have the highest bitrate. When videos are uploaded, they are often compressed to fit within size restrictions or enhance streaming speed. This compression often causes loss of data. The actual pixel count (ie 1920×1080 for 1080p) will be maintained but some of the details are lost so theres more artifacts. Netflix or example will limit the bitrate of their 4k streams to 10-20mbps. But a 4k blu ray of the same movie might be upwards of 75mbps. For most people it isn’t noticeable FWIW.
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