Display estimate as a range

[kornelski]

The estimate could be displayed as a range, e.g.: 0.5MB-2MB. This could be done simply by calculating estimate twice, with different assumptions (fudge factors).

Displaying it as a range would communicate to users that it's not an actual expected file size, and would communicate how imprecise the estimate is, so they would be less surprised when it's off.

[sindresorhus]

with different assumptions (fudge factors).

What would the different assumptions be?

[kornelski]

Magic constants for compression ratio and influence of quality. They are typical/guessed fudge factors, so it's valid to vary them.

[jsejcksn]

Any kind of improved accuracy for expectations is good, I think.

[sindresorhus]

From https://github.com/sindresorhus/Gifski/pull/205#issuecomment-714612557:

For lower/upper guesstimate I had in mind plugging in different constants/assumptions into the algorithm.

What would those constants/assumptions be? This issue is a bit vague on how exactly it should be solved.

[kornelski]

		let frameCount = duration * frameRateSlider.doubleValue
		let dimensions = resizableDimensions.changed(dimensionsType: .pixels).currentDimensions.value
		var fileSize = (Double(dimensions.width) * Double(dimensions.height) * frameCount) / 3
		fileSize = fileSize * (qualitySlider.doubleValue + 1.5) / 2.5

The / 3 part is a guess of compression ratio. It could be /5 and /2 for example.