1, cover blur: If the exposure is seriously underexposed or overexposed, the resolution or contrast of the picture is insufficient, and the picture has obvious jagged/smeared, mosaic and other problems, it is easy to cause cover blur.

2. Incomplete cover, splicing and incomplete content: for example, most pictures are blank, people or things are severely cut off, and the aspect ratio is seriously raised, which affects the reading of pictures.

3. The video picture is serious: especially in the case of serious black edges. For example, there are obvious black edges on three sides of the video, and one obvious black edge affects the audience's reading of the picture.