Can somebody please explain why do phone videos still look... "off"?

[Cod3rror]

I can always tell when a video is recorded using a smartphone, I don't know what it is but there is something "off" about those videos.

Take my Pixel, still video looks amazing in it! If there are no movements, the phone is mounted and it takes a video of a scene with little to no movements, the image quality is amazing!

But, once there is some movement, there is something "off" with the image. I cannot quite pin point what it is, is it dropped frames, or ghosting or something but videos don't feel pleasant and "smooth". If you watch a video created with a camcorder, a compact camera or a DSLR, when there is camera movement, video still looks smooth somehow.

Take a look at this video as an example (preferably on YouTube itself, at 4K):

If you stop the video, the picture, colours, everything looks amazing. But when you're playing it, the whole video looks terrible and unpleasant somehow.

Can someone who knows about video please explain why do smartphone videos, despite being high quality look unpleasant when in motion?

 

[lavrishevo]

Because most people are not shooting the video with a steady cam or gimbal.

 

[LIVEFRMNYC]

I think it's artificial correction and the CPU/GPU trying to keep up. This is something I've noticed on phones mostly on 4K at 60fps and sometimes at 30fps (depending on phone). Even on a stable tripod, you'll notice it when objects move.

 

[Lava Lamp Freak]

I think this video was likely recorded at a higher framerate than it was uploaded with.

 

[Cod3rror]

I think it's artificial correction and the CPU/GPU trying to keep up. This is something I've noticed on phones mostly on 4K at 60fps and sometimes at 30fps (depending on phone). Even on a stable tripod, you'll notice it when objects move.

I think this could be it.

 

[Phazer]

Also, with phones you don’t usually have control over shutter speed when filming.
On a dedicated camera you’re able to set the shutter speed at double the frame rate to get realistic motion blur, also thanks to the use of ND filters.
Phones on the other hand are probably filming at 1/1000 of a second in broad daylight, hence the unnatural motion blur.

 

[InuNacho]

Sensor size affects depth of field.
The sensor on a phone is microscopic compared to that of piece of 35mm film or image sensor.
The image on the left was taken with my DSLR's 35mm sensor size and the one on the right was with my Note 10. Both images were taken at around the same aperture.
Sensor size makes a huge impact on the bokeh or "blurriness" we're used to seeing on movies and higher end video equipment. Also my DSLR had a polarizing filter on the front of the lens while my Note 10 didn't.