If your chickens free range the feed you supply may or may not be critical to their health. A lot will depend on the forage area available and the quality and diversity of what they can forage.
If your chickens are contained, then feed becomes very important. There is rather more to providing a balanced diet than any of the above videos suggest.

You need to know what are the essential amino acids for optimum health. This information can be found on the net. Then you need to know what will provide those amino acids and work out the correct percentages for the type of fowl you keep.
Chickens are omnivores, much like humans and the same problems that apply to eating a vegan diet if you are human apply to chickens.
Humans have got around the complexity of mixing the correct components in order to get the essential amino acids in their correct proportions by eating meat and fish and later by making dairy produce.
I would not even consider making my own feed without a lot of research and most certainly not on the advice of some random person on the internet who apparently doesn't have much of an idea about the science involved in feed manufacturing.

If you insists on making your own feed and can't be bothered to research it properly then my advice is feed them fish and meat mixed in with whatever random ingredients you come up with.
For contained fowl you will save yourself a lot of work and promote better health in your flock by feeding a commercially produced feed with the correct ratios and adding as a supplement some fish or meat every couple of days.