io.rb

require 'openssl'
require 'open-uri'

url = "https://i1.ytimg.com/vi/2K-8FJ114kU/hqdefault.jpg"


# Errors
response = open(url, ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE)
tempfile = Tempfile.new('youtube', encoding: "ascii-8bit")
tempfile.write response.read

Paperclip::Trimmer.make(tempfile) #=> convert error, "no decode delegate for this image format", "no images defined"



# Works
response = open(url, ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE)
tempfile = Tempfile.new('youtube', encoding: "ascii-8bit")
tempfile.write response.read

tempfile.rewind
Paperclip::Trimmer.make(tempfile)