Context: Since June 2007, YouTube's videos have been available for viewing on a range of Apple products. This required YouTube's content to be transcoded into Apple's preferred video standard, H.264, a process that took several months. YouTube videos can be viewed on devices including Apple TV, iPod Touch and the iPhone. In July 2010, the mobile version of the site was relaunched based on HTML5, avoiding the need to use Adobe Flash Player and optimized for use with touch screen controls. The mobile version is also available as an app for the Android platform. In September 2012, YouTube launched its first app for the iPhone, following the decision to drop YouTube as one of the preloaded apps in the iPhone 5 and iOS 6 operating system. According to GlobalWebIndex, YouTube was used by 35% of smartphone users between April and June 2013, making it the third most used app.

Question: When did youtube become available on Apple products?
Answer: June 2007

Question: When did youtube launch its first app for the iPhone?
Answer: September 2012

Question: What percentage of Smartphone users use the youtube app?
Answer: 35%

Question: What is Apple's prefered video standard?
Answer: H.264

Question: How long did it take to transfer Youtube's content to Apple's standard?
Answer: several months

Question: What company's products has YouTube's videos been available on since July 2007?
Answer: Unanswerable

Question: What is H.642 to Apple?
Answer: Unanswerable

Question: What was relaunched in June 2010?
Answer: Unanswerable

Question: What did YouTube launch in July 2012?
Answer: Unanswerable

Question: How many smartphone users used YouTube between April and June 2012?
Answer: Unanswerable