优化视频导出的一些细节

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -587,11 +587,6 @@ static dispatch_once_t onceToken;
         NSDateFormatter *formater = [[NSDateFormatter alloc] init];
         [formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss-SSS"];
         NSString *outputPath = [NSHomeDirectory() stringByAppendingFormat:@"/tmp/video-%@.mp4", [formater stringFromDate:[NSDate date]]];
-        if (videoAsset.URL && videoAsset.URL.lastPathComponent) {
-            outputPath = [outputPath stringByReplacingOccurrencesOfString:@".mp4" withString:[NSString stringWithFormat:@"-%@", videoAsset.URL.lastPathComponent]];
-        }
-        // NSLog(@"video outputPath = %@",outputPath);
-        session.outputURL = [NSURL fileURLWithPath:outputPath];
         
         // Optimize for network use.
         session.shouldOptimizeForNetworkUse = true;
@@ -607,7 +602,12 @@ static dispatch_once_t onceToken;
             return;
         } else {
             session.outputFileType = [supportedTypeArray objectAtIndex:0];
+            if (videoAsset.URL && videoAsset.URL.lastPathComponent) {
+                outputPath = [outputPath stringByReplacingOccurrencesOfString:@".mp4" withString:[NSString stringWithFormat:@"-%@", videoAsset.URL.lastPathComponent]];
+            }
         }
+        // NSLog(@"video outputPath = %@",outputPath);
+        session.outputURL = [NSURL fileURLWithPath:outputPath];
         
         if (![[NSFileManager defaultManager] fileExistsAtPath:[NSHomeDirectory() stringByAppendingFormat:@"/tmp"]]) {
             [[NSFileManager defaultManager] createDirectoryAtPath:[NSHomeDirectory() stringByAppendingFormat:@"/tmp"] withIntermediateDirectories:YES attributes:nil error:nil];

TZImagePickerController/ViewController.m

@@ -584,7 +584,7 @@
     _selectedPhotos = [NSMutableArray arrayWithArray:@[coverImage]];
     _selectedAssets = [NSMutableArray arrayWithArray:@[asset]];
     // open this code to send video / 打开这段代码发送视频
-    [[TZImageManager manager] getVideoOutputPathWithAsset:asset presetName:AVAssetExportPreset640x480 success:^(NSString *outputPath) {
+    [[TZImageManager manager] getVideoOutputPathWithAsset:asset presetName:AVAssetExportPresetLowQuality success:^(NSString *outputPath) {
         // NSData *data = [NSData dataWithContentsOfFile:outputPath];
         NSLog(@"视频导出到本地完成,沙盒路径为:%@",outputPath);
         // Export completed, send video here, send by outputPath or NSData