Some tips on recoding videos(h264,h265, bik, bk2)

[elit]

Thank you Felice, but your calculation above address very different purpose. To clarify, your calculation above is about getting best possible quality for certain length of video while still fitting specific medium format. In other words, targeted size is a known constant and bitrate is calculated to get most of that size.

On the contrary when repacking game videos, targeted size is a variable and objective is to get it as low as possible. Therefore its about quality vs size, not about bitrate for certain known size. And for that, you absolutely have to consider resolution which in turn must be selected based on targeted display resolutions. Specifically, my 640x360 is exact 1/3 of 1920x1080(for which it was chosen) in terms of W and H and its exact division. It will still look ok as it is closer to 1/2 res., whereas 1/4 res for example was already too low in my tests(regardless of bitrate/quality). So pixels do matter here. You want to get as low resolution and bitrate as possible to save as much space as possible, while compromising on quality as little as possible.

I agree there is not mathematically standard bitrate and it also depend on the codec, I referred to 2880 as "enough" in scale ratio because for all modern codecs if you check various original FullHD game videos they almost never have significantly more than that. 2880 was referred only as an example for being "enough" for majority of FullHD content out there(in games).