图片模式时，封面图使用uiimageview渲染

BFRecordScreenKit/Classes/RecordScreen/View/Cell/BFImageCoverViewCell.swift

@@ -84,6 +84,7 @@ open class BFImageCoverViewCell: UICollectionViewCell {
         if(recordItem?.mediaType == .Image){
             playImageView.image = coverImg
         }else{
+            playImageView.removeFromSuperview()
             picture = GPUImagePicture(image: coverImg)
             picture.addTarget(filter)
             filter.addTarget(playView)