How to convert No-native HD videos into HD or highter , Science Project ?

[匿名]

2017-11-02 9:41 am

hello i have a science project next week and i want to impress my class by making some of our SD Videos into HD videos bit whenever i convert them whether it be 4K or 8K it doesn't matter the image quality stays the same and i don't get it ?

i looked it up and what i understood is that the if the source is defaulted at a specific quality then it is gonna stays so til it is changed from the source but most of our videos are copies and not the source is that the problem or is it that my converter is low-quality i use wondershare video converter ultimate edition but even so it can't do an ultimate job well ?

更新1:

for others who don't understand the situation is that whenever i convert the SD into HD it look as SD no matter what resolution or bitrate it is in ? so what is the answer of this question ? i tried to solve it by my self and what i found out is that because what i'm converting is a copy of a source meaning that the source might be deafulted at SD so it can't change no matter what is that corret ? do copies nerf converters ? or is it something else ?

回答 (1)

Robert J

2017-11-02 2:58 pm

✔ 最佳答案

You cannot do it.

Video is just a sequence of still images.
Whatever the quality of an image is, changing the pixel resolution higher does not change the quality.

Imagine a picture or photo, that you put a set of grid lines over to divide it in to squares; they are "pixels". Each pixel can only be one colour.

If you use an eg. 10x10 grid, then set the colour in each pixel square to the average of the picture colour, that's like encoding an image at low quality. All the fine detail is lost and blurred together within each pixel area.

If you start out with a 100x100 grid and do the same, your pixels are ten times smaller and a lot more detail is captured.

However, if you do the 10x10 and make each pixel, then put the 100x100 over the top, you still get the colours of the 10x10 pixels, just divided up more - all the detail has already been thrown away and lost forever when the original low quality image was stored.

That's the effect you are seeing; you simply cannot restore details that have been thrown away or blurred out by the original low quality video encoding.

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