Is there any explanation for the blue sky of Mars shown in this video of photos transmitted by the Chinese rover?
Despite my comments about the sky not always being red, I think there is a simpler explanation.
This video was made by a "content" company on a monetized YouTube channel. The screenshot is simply a colorized version of a black and white image
Note that the notes below the video do not provide the source of the images. You can't check the source of their data, they offer it only in the form they want you to see.
from the "Front Obstacle Avoidance Cam B" shown later between about
00:43 in the video.
Edit: The original color analysis I had here is not conclusive as @Ruslan points out so I'll replace it. It's still viewable in the edit history. Instead, while not conclusive I'll compare a cropped bit of Ruslan's suggested PIA19070 with a cropped bit of the (likely) colorized image screenshot from the video.
Don't trust random monetized channels!
Why wouldn't the sky appear that way? The sky color has little to do with the color of the land. It is to do with scattering of light by particles in the air as we are looking away from the planet. Think about it, why isn't the Earth's sky green here in the Northwest where there is endless forest? Read the NASA article below for why the sky is "blue". When we see the planet Mars from a distance, then it is reflected light from the surface of the planet which is predominately red, and we are viewing towards the planet. Similarly, the Earth likes blue.
Reference Del Genio, Anthony D. (2003) Why is the sky blue? NASA. https://www.scientificamerican.com/article/why-is-the-sky-blue/
The sky of Mars is blue like the one of Earth. The ESA picture you can admire below the text shows unequivocally that the sky of the Red Planet is much like the one above the Sahara desert.