diff --git a/modules/cudacodec/src/ffmpeg_video_source.cpp b/modules/cudacodec/src/ffmpeg_video_source.cpp
index 20a02f84b..867910fee 100644
--- a/modules/cudacodec/src/ffmpeg_video_source.cpp
+++ b/modules/cudacodec/src/ffmpeg_video_source.cpp
@@ -54,16 +54,12 @@ using namespace cv::cudacodec::detail;
 
 static std::string fourccToString(int fourcc)
 {
-    union {
-        int u32;
-        unsigned char c[4];
-    } i32_c;
-    i32_c.u32 = fourcc;
-    return cv::format("%c%c%c%c",
-        (i32_c.c[0] >= ' ' && i32_c.c[0] < 128) ? i32_c.c[0] : '?',
-        (i32_c.c[1] >= ' ' && i32_c.c[1] < 128) ? i32_c.c[1] : '?',
-        (i32_c.c[2] >= ' ' && i32_c.c[2] < 128) ? i32_c.c[2] : '?',
-        (i32_c.c[3] >= ' ' && i32_c.c[3] < 128) ? i32_c.c[3] : '?');
+    char str[5] = {'\0', '\0', '\0', '\0'};
+    for (int i = 0; i < 4; i++) {
+        char c = (char)(fourcc >> i*8);
+        str[i] = ' ' <= c && c < 128 ? c : '?';
+    }
+    return std::string(str);
 }
 
 // handle old FFmpeg backend - remove when windows shared library is updated
diff --git a/modules/cudev/include/opencv2/cudev/util/vec_traits.hpp b/modules/cudev/include/opencv2/cudev/util/vec_traits.hpp
index bff3744ef..92f360c88 100644
--- a/modules/cudev/include/opencv2/cudev/util/vec_traits.hpp
+++ b/modules/cudev/include/opencv2/cudev/util/vec_traits.hpp
@@ -188,6 +188,7 @@ template<> struct VecTraits<char4>
 
 namespace cv {
 
+#ifndef CV_32U
 template <> class DataType<uint>
 {
 public:
@@ -202,6 +203,7 @@ public:
            type         = CV_MAKE_TYPE(depth, channels)
          };
 };
+#endif
 
 #define CV_CUDEV_DATA_TYPE_INST(_depth_type, _channel_num) \
     template <> class DataType< _depth_type ## _channel_num > \
diff --git a/modules/cudev/test/test_integral.cu b/modules/cudev/test/test_integral.cu
index 3c34ffcc0..6bdb98bd9 100644
--- a/modules/cudev/test/test_integral.cu
+++ b/modules/cudev/test/test_integral.cu
@@ -48,7 +48,7 @@ using namespace cv::cuda;
 using namespace cv::cudev;
 using namespace cvtest;
 
-TEST(Integral, _8u)
+TEST(DISABLED_Integral, _8u)
 {
     const Size size = randomSize(100, 400);
 
@@ -84,7 +84,7 @@ TEST(Integral, _32f)
     ASSERT_PRED_FORMAT2(cvtest::MatComparator(1e-5, 0), dst_gold, Mat(dst));
 }
 
-TEST(Integral, _8u_opt)
+TEST(DISABLED_Integral, _8u_opt)
 {
     const Size size(640, 480);