1，msticker 为空判断 2， 修改 LOG

BFFramework/Classes/Stuckpoint/Controller/PQStuckPointPublicController.swift

@@ -428,13 +428,15 @@ extension PQStuckPointPublicController {
 
         var orgeBitRate = (editProjectModel?.sData?.videoMetaData?.videoWidth ?? 0) * (editProjectModel?.sData?.videoMetaData?.videoHeight ?? 0) * 3
 
-        for stick in mStickers! {
-            if stick.type == StickerType.VIDEO.rawValue {
-                let asset = AVURLAsset(url: URL(fileURLWithPath: documensDirectory + stick.locationPath), options: avAssertOptions)
-
-                let cbr = asset.tracks(withMediaType: .video).first?.estimatedDataRate
-                if Int(cbr ?? 0) > orgeBitRate {
-                    orgeBitRate = Int(cbr ?? 0)
+        if(mStickers != nil){
+            for stick in mStickers! {
+                if stick.type == StickerType.VIDEO.rawValue {
+                    let asset = AVURLAsset(url: URL(fileURLWithPath: documensDirectory + stick.locationPath), options: avAssertOptions)
+
+                    let cbr = asset.tracks(withMediaType: .video).first?.estimatedDataRate
+                    if Int(cbr ?? 0) > orgeBitRate {
+                        orgeBitRate = Int(cbr ?? 0)
+                    }
                 }
             }
         }
@@ -455,7 +457,8 @@ extension PQStuckPointPublicController {
             }
         }
         exporter.completion = { [weak self] url in
-            BFLog(message: "导了完成: \(url)")
+            BFLog(message: "MovieOutput total frames appended:导了完成: \(url) 生成视频时长为：\(CMTimeGetSeconds(AVAsset.init(url: url).duration))")
+            
             // 导出完成后取消导出
             if self?.exporter != nil {
                 self?.exporter.cancel()