Movie storage

[david-zwicker]

A first version of a special storage class that stores field in a movie using ffmpeg

[VascoSch92]

Suggested change

	def pix_fmt_data(self) -> str:
	return {1: "gray", 3: "rgb24", 4: "rgba"}[self.channels]
	def pix_fmt_data(self) -> str:
	if self.channels == 1:
	return "gray"
	elif self.channels == 3:
	return "rgb24"
	elif self.channels == 4:
	return "rgba"
	else:
	raise ValueError()

In this way it is much easier to understand what is going on.

Moreover, what happens if self.channels is not one of 1, 3, 4 ?

With your method: a key-error will be thrown but actually is a value error because the class work just if we have self.channels in [1, 3, 4].

Perhaps, an idea could be to add a check in the post_init method to ensure that channels is one of the above one.

[david-zwicker]

Good point! I'll adjust it to throw a more useful error in the future.