motion smoothing

the-new-dolby-vision-2-hdr-standard-is-probably-going-to-be-controversial

The new Dolby Vision 2 HDR standard is probably going to be controversial

Dolby has announced the features of Dolby Vision 2, its successor to the popular Dolby Vision HDR format.

Whereas the original Dolby Vision was meant to give creators the ability to finely tune exactly how TVs present content in HDR, Dolby Vision 2 appears to significantly broaden that feature to include motion handling as well—and it also tries to bridge the gap between filmmaker intent and the on-the-ground reality of the individual viewing environments.

What does that mean, exactly? Well, Dolby says one of the pillars of Dolby Vision 2 will be “Content Intelligence,” which introduces new “AI capabilities” to the Dolby Vision spec. Among other things, that means using sensors in the TV to try to fix the oft-complained-about issue of shows being too dark.

Many editors and filmmakers tweak their video content to be best viewed in a dark room on a high-end TV with strong peak brightness, contrast, color accuracy, and so on. Unfortunately, that sometimes means that some shows are laughably dark on anything but the most optimal target setup—think Apple TV+’s Silo, or the infamous Battle of Winterfell in the final season of Game of Thrones, both of which many people complained were too dark for clear viewing.

With Content Intelligence, Dolby Vision 2 will allegedly make the image “crystal clear” by “improving clarity in any viewing environment without compromising intent.” Further, it will use ambient light detection sensors in supporting TVs to adjust the content’s presentation based on how bright the viewer’s room is.

Fixing motion smoothing—or making it worse?

There’s plenty that’s going to be controversial in Content Intelligence with some purists, but it’s another feature called Authentic Motion that’s probably going to cause the biggest stir for Dolby Vision 2.

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Roku owners face the grimmest indignity yet: Stuck-on motion smoothing

Buttery and weird —

Software updates strike again, leaving interpolated frames in unwanted places.

Couple yelling at each other, as if in a soap opera, on a Roku TV, with a grotesque smoothing effect applied to both people.

Enlarge / Motion smoothing was making images uncanny and weird long before AI got here.

Aurich Lawson | Getty Images | Roku

Roku TV owners have been introduced to a number of annoyances recently through the software update pipeline. There was an arbitration-demanding terms of service that locked your TV until you agreed (or mailed a letter). There is the upcoming introduction of ads to the home screen. But the latest irritation hits some Roku owners right in the eyes.

Reports on Roku’s community forums and on Reddit find owners of TCL HDTVs, on which Roku is a built-in OS, experiencing “motion smoothing” without having turned it on after updating to Roku OS 13. Some people are reporting that their TV never offered “Action Smoothing” before, but it is now displaying the results with no way to turn it off. Neither the TV’s general settings, nor the specific settings available while content is playing, offer a way to turn it off, according to some users.

“Action smoothing” is Roku’s name for video interpolation, or motion smoothing. The heart of motion smoothing is Motion Estimation Motion Compensation (MEMC). Fast-moving video, such as live sports or intense action scenes, can have a “juddery” feeling when shown on TVs at a lower frame rate. Motion smoothing uses MEMC hardware and algorithms to artificially boost the frame rate of a video signal by creating its best guess of what a frame between two existing frames would look like and then inserting it to boost the frame rate.

When it works, a signal looks more fluid and, as the name implies, smooth. When it is left on and a more traditional signal at 24 or 30 frames per second is processed, it works somewhat too well. Shows and films look awkwardly realistic, essentially lacking the motion blur and softer movement to which we’re accustomed. Everything looks like a soap opera or like you’re watching a behind-the-scenes smartphone video of your show. It’s so persistent an issue, and often buried in a TV’s settings, that Tom Cruise did a whole PSA about it back in 2018.

Ars has contacted Roku for comment and will update this post with a response. When affected Roku TVs regain their ability to keep motion smoothing at bay, the setting is typically located in the “Expert Settings” area of the TV or by enabling “Movie” mode from the quick settings.

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