Disney will be at an advantage over new streaming competitors now that it has control over Hulu.

The combined assets of Disney and Fox along with Hulu raise Disney's content hours above 57,000. WarnerMedia's streaming platform, including HBO, would include over 10,000, according to Ampere Analysis.

As companies remove licensed titles from Netflix and Amazon, HBO and WarnerMedia could be at a disadvantage.

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Comcast relinquished operational control of Hulu to Disney on Tuesday and agreed to sell its 33% stake in the streaming service to Disney in five years. The move gives Disney a dramatic boost in its streaming aspirations, and it puts competitors like HBO and its parent WarnerMedia at a severe disadvantage.

The agreement with Comcast gives Disney full ownership of Hulu. (Hulu's ownership was previously split three ways: roughly 60% Disney, 30% Comcast, and 10% AT&T. AT&T recently sold its stake back to Hulu for $1.43 billion.)

Read more: Disney revealed the details of its Netflix rival, Disney Plus, including its price and release date

Disney is also launching its own streaming platform, Disney Plus, in November at $6.99 a month, and it said last month that it would most likely bundle the service with Hulu and ESPN Plus at a discount. This poses a significant threat to competitors, primarily those like HBO that don't have a large content library.

HBO's streaming service, included with a paid cable subscription as HBO Go or available on its own as HBO Now, has less than 5,000 hours of content. HBO Go and other streaming studio brands — such as Showtime Anytime, Starz Play, and CBS All Access — average 3,800 hours of content compared with the 42,000 average hours of the streaming "majors" like Netflix, Hulu, and Amazon Prime Video, according to an Ampere Analysis report released Wednesday.

The chart below shows the hours of content for each platform:

Ampere Analysis

Amazon Prime Video leads the pack with about 50,000 hours' worth of content (though it's not all good), and Hulu follows with just over 40,000 hours.

But the combined streaming power of Disney Plus and Hulu would put Disney at an advantage over established companies like Netflix and Amazon as well as those like WarnerMedia and NBCUniversal that are planning to enter the streaming game with their own platforms.

With so many companies entering the streaming ring, licensed titles on Netflix and Amazon will begin to disappear. Disney has already ended a licensing agreement with Netflix, planning to make its theatrical releases eventually available on Disney Plus starting with "Captain Marvel."

Disney's library, combining Disney and Fox assets with Hulu's catalog, would be pushed to more than 57,000 hours of content, according to Ampere. Netflix and Amazon would be reduced to 27,000 hours and 36,000 hours if their major studio licensed content were stripped away, as the chart below shows.

Ampere Analysis

WarnerMedia, the company formed in AT&T's merger with Time Warner, is expected to launch a streaming platform later this year that is likely to include HBO. AT&T has promised to ramp up content to compete with Netflix. It's a stark change to HBO's traditional strategy of a prime Sunday-night lineup that focuses on quality over quantity. For starters, AT&T plans to introduce two hours of prime-time original programming on Monday nights along with Sundays.

Amid the changes to Time Warner and HBO, there have been leadership shake-ups. Richard Plepler resigned as HBO's CEO in February. Other key HBO executive exits include the global distribution head, Bernadette Aulestia, and the president and revenue chief, Simon Sutton. Variety reported that Plepler and the former Turner president David Levy were becoming agitated with AT&T's changes.

Read more: Disney will spend $500 million on original content to take on Netflix next year, but its strategy could actually risk billions

"It's not hours a week, and it's not hours a month," WarnerMedia CEO John Stankey said in July of HBO. "We need hours a day. You are competing with devices that sit in people's hands that capture their attention every 15 minutes. I want more hours of engagement."

But even including HBO, the WarnerMedia streaming platform would include 10,682 hours of content, according to Ampere — far below Disney and Hulu.

This should be a cause of concern for HBO, especially with Disney Plus at a highly competitive price of $6.99 a month. A Disney Plus-Hulu bundle could be more attractive from both price and content standpoints than the WarnerMedia service.

"The key to building a streaming channel family is the flexibility it gives Disney is bundling services and, crucially, boosting the average revenue it makes from each customer (ARPU)," Ampere said in its report. "Not every customer will want Disney+ and Hulu, or even ESPN, but with flexible combinations, three streaming brands will mean the $6.99 Disney+ price point is just the beginning in leveraging the revenue potential of its streaming portfolio."