As a general rule for video compression without loss of quality?

I noticed on iTunes for example I can download a full movie of 1080 p that looks great, and it won't be like 3 or 4 GB, sometimes less. But I've got 15 minutes videos that are much more than that.

I want to compress a video and then store it in my videos on my computer folder. But they are still huge and I'm still too afraid to go too low because I have no idea how saying how much it will affect quality.

Is there a general rule? Perhaps a way to divide the size of the original file? If the initial project is say 40 GB, which is not a lot compared to Hollywood movies, I'm sure that there are thousands of GB. How to make it down to 3 or 4 GB and it look fine?

I'm talking about the videos that I'm done, I'm not going to change again once, etc. I know how to export just in case I need to go back.

There is only one "rule" when it comes to compression without quality loss - files will be huge.

Now, if we change this scenario a bit to say "without significant quality loss", the situation becomes more complex.  Different people notice different things, and there are a LOT of variables that go into the encoding.  There is no simple guide for this.  My advice would be either learn about compression, or simply you don't have to worry about the size so.

Hard drives are cheap.  Download more when you need it.

Tags: Premiere

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