This is the video released by Perseverance (rover):
Why did NASA release Perseverance (rover) videos with a stop motion effect?
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This animated gif is comprised of images that were acquired by the Navigation Camera (Navcam) located on the rover mast, part of the Mastcam-Z instrument. Mastcam-Z is capable of acquiring videos (generally at about 4 frames per second), but sending this data back to Earth could take a long time.
To send data to Earth, the rover transmits a signal to a Martian orbiter (usually the Mars Reconnaissance Orbiter, Mars Odyssey, Trace Gas Orbiter, or Maven), which then relays the data back to Earth via the Deep Space Network. The data rate for each transmission is on the order of 2 megabits per second - and transmission may only occur a few times a day. A video of the rover wheel motion (rather than a series of a few images) would have required more bandwidth, which may have delayed other high priority data products from making it to Earth in a timely manner.
For this particular wheel-checkout test, collecting a few images of the wheels, rather than a video, must have been sufficient to ensure that the system was working.