I recently bought a dji fpv. I shot some videos, those videos can be played in my mobile Samsung A50 but cannot be played in my pc. I tried to open them in adobe premiere but it shows "these files does not have audio/video streams". What am I missing here? Can anyone help me?

Are the videos 4K? 4K videos can be a problem for computers a few years old. I imagine your Windows 8.1 machine is isn't powerful enough to handle these videos so it likely doesn't have the drivers required.

Can you use other 4K video files on your computer?

Have you tried changing the resolution recorded in the drone? I have a relatively new PC but I often use 1080P for video since the 4K files are so huge.

I'd suggest trying several different resolutions and see which resolutions are acceptable to your computer.