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Video will be blurred when converted into MP4 format. Is there any way to solve it? Or what format will be clearer.
There are three reasons for this. Because you talk too little, you need to know the basics first.

Factors affecting the size and definition of video files

First, the format: the largest AVI is nearly 10 times that of WMV, and the largest AVI is 15 times that of MPEG, and so on. The smallest AVI is FLV format. The larger the file, the clearer the video.

The second is video resolution: the larger the file, the clearer the video.

The third is the bit rate of video. The higher the file, the bigger the video.

Video format conversion, the video resolution can not be greater than the resolution of the material, otherwise it will be very blurred. No matter how high the resolution is, it will not be clearer than the material.

No matter how high the bit rate of video is, the converted video will not be clearer than the material.

These are the basic features of video.

By contrast, did you change from HD format to HD format? Or is the resolution of the video reduced? Or is the bit rate of the video reduced? Or all three factors?