This information is applicable to all the realme devices.
The clarity of the video is related to the quality of the video itself and the network environment. It is recommended that you perform the following troubleshooting:
1. Check if the original video itself is clear enough.
If the resolution of the original video itself is not high, then playing on the device will not be clear enough. You can try to change the device to play the same video to check if it is clear.
2. Check if the network environment is normal.
For some online videos, if the network conditions are not good, it is possible to automatically jump to low resolution video. You can change the network and manually select higher definition for playback.
If this does not solve your problem, please go to the nearby realme service center for testing.