1、修正验证视频时长判断参数错误的问题；2、视频关键帧图片每次创建临时文件夹存储，生成特征文件后，临时文件夹与文件删除。

Signed-off-by: zhangwei <zhangwei2@iie.ac.cn>

src/main/java/com/nis/web/controller/configuration/ntc/AvController.java

@@ -168,6 +168,7 @@ public class AvController extends BaseController  {
 							file.delete();
 						}
 					}
+					FileUtils.deleteDirectory(picPath);
 					if(zouts!=null){
 						zouts.close();
 					}
@@ -526,7 +527,7 @@ public class AvController extends BaseController  {
 		int second = (int) (ls-hour*3600-minute*60);
 		length = hour+"'"+minute+"''"+second+"'''";
 		logger.info(file.getName()+"时长："+length);
-		if(ls>0 && second>Constants.AV_DURATION_LIMIT){
+		if(ls>0 && ls>Constants.AV_DURATION_LIMIT){
 			return false;
 		}else{
 			return true;
@@ -546,7 +547,7 @@ public class AvController extends BaseController  {
 		String sep = System.getProperty("file.separator");
 		String random = UUID.randomUUID()+"";
 		String srcFilePath = Constants.AV_FILE_PATH+"video"+sep+"srcFile";//视频源文件保存路径
-		String picFilePath = StringUtils.getUserfilesBaseDir()+"video"+sep+"picFile";//视频生成的关键帧图片文件保存路径 
+		String picFilePath = StringUtils.getUserfilesBaseDir()+"video"+sep+"picFile"+sep+random+sep;//视频生成的关键帧图片文件保存路径 
 		
 		FileUtils.createDirectory(srcFilePath);
 		FileUtils.createDirectory(picFilePath);