Does a youtube video with a still image (ex. music) drain as much mobile data as a moving video (gameplay, etc.), and why/why not?
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Let’s talk about video compression.
If you were to transmit every frame of a video as a whole image, it would get very big very quickly. Instead, we use a trick. Most frames from a video are very close to the previous frame, so we just have to store the instructions on how to build one frame from the previous one.
One problem with *just* doing only those difference calculations is that, if you wanted to skip 2/3 of the way through, you would need to load the whole video up to that point. Instead, we have something called Key Frames, which are single frames that have their entire picture stored.
How often those key frames are generated is something that you can control, but for YouTube, they recommend 2 seconds, and you cannot exceed 4 seconds. You’re still going to have a lot of data for the key frames, although you don’t have as much in the calculated frames. So it will be smaller, but not necessarily by a significant amount.
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