1，修复多个视频素材只播放了一个的问题

BFFramework/Classes/Stuckpoint/Controller/PQStuckPointEditerController.swift

@@ -1419,7 +1419,15 @@ extension PQStuckPointEditerController {
                             sticker.clipCount = LACount + LBCount
                             // LACount + LBCount = 0 ?  11s视频x6倍速
                             if sticker.clipCount == 0 { sticker.clipCount = 1 }
-                            for i in 0 ... sticker.clipCount {
+                            
+                            //每一个素材的取点的开始位置
+                            var pointStartIndex:Int = 0
+                            if(lastPointIndex == nil){
+                                pointStartIndex = 0
+                            }else{
+                                pointStartIndex = (lastPointIndex ?? 0) + 1
+                            }
+                            for i in pointStartIndex ... (sticker.clipCount + pointStartIndex){
                                 
                                 if(i < stuckPointsTemp.count){
                                     BFLog(message: "直接添加")