Native resolution is "the only [visual] difference" between the PlayStation 4 and Xbox One versions of Call of Duty: Ghosts, Infinity Ward has claimed.

"Yep, it's the only difference," executive producer Mark Rubin told Metro when quizzed over whether resolution was the only thing separating the two versions. "The TVs are different on some of them, but... they both have their different rendering engines but they're as close as possible.

"It really comes down to resolution. Xbox is upscaled 720, it's outputting at 1080p but it's upscaled from 720. Whereas PlayStation 4 is native 1080p. So that's really the only graphical difference. But it is enough. Some people here are saying they don't really notice a difference..."

It was revealed last week that the Xbox One version of Call of Duty: Ghosts would render natively at 720p with the PS4 version rendering at 1080p.

However, Joystiq reported yesterday that the PS4 version "has noticeable technical issues", claiming that the frame rate "sometimes slowing to a crawl, particularly during set-piece moments with multiple effects.

"One specific moment I was able to replicate multiple times on PS4 was a campaign scene featuring explosions and smoke that ran smoothly on Xbox 360 and PS3 but chugged on Sony's next-gen platform," the site said. "These frame rate hitches happen throughout the campaign on PlayStation 4 and, in a series known for its Hollywood-inspired bombast, it detracted from the experience."

Footage of the Xbox One version also appeared to highlight frame drops, although it isn't clear whether the drops are due to a processing error of the footage itself or indicative of the final product.

Call of Duty: Ghosts launched yesterday on Xbox 360, PlayStation 3, PlayStation 4, PC and Wii U, and launches on Xbox One on November 15.