diff --git a/src/QZXingFilter.cpp b/src/QZXingFilter.cpp
index 8ec2998..f32aa77 100644
--- a/src/QZXingFilter.cpp
+++ b/src/QZXingFilter.cpp
@@ -24,10 +24,24 @@ namespace {
             qBound<uchar>(0, uchar((298 * C + 516 * D + 128) >> 8), 255)
         );
     }
+
+    uchar yuvToGray2(uchar y, uchar u, uchar v)
+    {
+        double rD = y + 1.4075 * (v - 128);
+        double gD = y - 0.3455 * (u - 128) - (0.7169 * (v - 128));
+        double bD = y + 1.7790 * (u - 128);
+
+        return gray(
+            qBound<uchar>(0, (uchar)::floor(rD), 255),
+            qBound<uchar>(0, (uchar)::floor(gD), 255),
+            qBound<uchar>(0, (uchar)::floor(bD), 255)
+        );
+    }
 }
 
 QZXingFilter::QZXingFilter(QObject *parent)
     : QAbstractVideoFilter(parent)
+    , decoder(QZXing::DecoderFormat_QR_CODE)
     , decoding(false)
 {
     /// Connecting signals to handlers that will send signals to QML
@@ -246,28 +260,6 @@ void QZXingFilterRunnable::processVideoFrameProbed(SimpleVideoFrame & videoFrame
         image_ptr = new QImage(data, width, height, QImage::Format_RGB16);
         break;
     case QVideoFrame::Format_YUV420P:
-        //fix for issues #4 and #9
-        image_ptr = new QImage(captureRect.targetWidth, captureRect.targetHeight, QImage::Format_Grayscale8);
-        pixel = image_ptr->bits();
-        wh = width * height;
-        w_2 = width / 2;
-        wh_54 = wh * 5 / 4;
-
-        for (int y = captureRect.startY; y < captureRect.endY; y++) {
-            const int Y_offset = y * width;
-            const int y_2 = y / 2;
-            const int U_offset = y_2 * w_2 + wh;
-            const int V_offset = y_2 * w_2 + wh_54;
-            for (int x = captureRect.startX; x < captureRect.endX; x++) {
-                const int x_2 = x / 2;
-                const uchar Y = data[Y_offset + x];
-                const uchar U = data[U_offset + x_2];
-                const uchar V = data[V_offset + x_2];
-                *pixel = yuvToGray(Y, U, V);
-                ++pixel;
-            }
-        }
-        break;
     case QVideoFrame::Format_NV12:
         /// nv12 format, encountered on macOS
         image_ptr = new QImage(captureRect.targetWidth, captureRect.targetHeight, QImage::Format_Grayscale8);
@@ -290,22 +282,29 @@ void QZXingFilterRunnable::processVideoFrameProbed(SimpleVideoFrame & videoFrame
                 ++pixel;
             }
         }
+
         break;
     case QVideoFrame::Format_YUYV:
         image_ptr = new QImage(captureRect.targetWidth, captureRect.targetHeight, QImage::Format_Grayscale8);
         pixel = image_ptr->bits();
 
         for (int y = captureRect.startY; y < captureRect.endY; y++){
-            const uint32_t *row = &yuvPtr[y*(width/2)-(width/4)];
-            for (int x = captureRect.startX; x < captureRect.endX; x++){
+            const uint32_t *row = &yuvPtr[y*(width/2)];
+            int end = captureRect.startX/2 + (captureRect.endX - captureRect.startX)/2;
+            for (int x = captureRect.startX/2; x < end; x++){
                 const uint8_t *pxl = reinterpret_cast<const uint8_t *>(&row[x]);
                 const uint8_t y0 = pxl[0];
                 const uint8_t u  = pxl[1];
                 const uint8_t v  = pxl[3];
-                *pixel = yuvToGray(y0, u, v);
+                const uint8_t y1 = pxl[2];
+
+                *pixel = yuvToGray2(y0, u, v);
+                ++pixel;
+                *pixel = yuvToGray2(y1, u, v);
                 ++pixel;
             }
         }
+
         break;
         /// TODO: Handle (create QImages from) YUV formats.
     default:
diff --git a/src/zxing/zxing/common/ByteArray.h b/src/zxing/zxing/common/ByteArray.h
index 7a2afb9..acd4f59 100644
--- a/src/zxing/zxing/common/ByteArray.h
+++ b/src/zxing/zxing/common/ByteArray.h
@@ -20,6 +20,7 @@
 
 #include <vector>
 #include <cstdint>
+#include "Types.h"
 
 namespace zxing {
 
@@ -33,8 +34,8 @@ public:
     ByteArray(std::initializer_list<uint8_t> list) : std::vector<uint8_t>(list) {}
     explicit ByteArray(int len) : std::vector<uint8_t>(len, 0) {}
     int length() const { return static_cast<int>(size()); }
-    const char* charPtr() const { return reinterpret_cast<const char*>(data()); }
-    char* charPtr() { return reinterpret_cast<char*>(data()); }
+    const zxing::byte* bytePtr() const { return reinterpret_cast<const zxing::byte*>(data()); }
+    zxing::byte* bytePtr() { return reinterpret_cast<zxing::byte*>(data()); }
 };
 
 }
diff --git a/src/zxing/zxing/oned/MultiFormatUPCEANReader.cpp b/src/zxing/zxing/oned/MultiFormatUPCEANReader.cpp
index fbff86b..330c218 100644
--- a/src/zxing/zxing/oned/MultiFormatUPCEANReader.cpp
+++ b/src/zxing/zxing/oned/MultiFormatUPCEANReader.cpp
@@ -92,7 +92,8 @@ Ref<Result> MultiFormatUPCEANReader::decodeRow(int rowNumber, Ref<BitArray> row,
     // here, and convert an EAN-13 result to a UPC-A result if
     // appropriate.
     bool ean13MayBeUPCA =
-      result->getBarcodeFormat() == BarcodeFormat::EAN_13 &&
+      (result->getBarcodeFormat() == BarcodeFormat::UPC_A ||
+       result->getBarcodeFormat() == BarcodeFormat::EAN_13) &&
       result->getText()->charAt(0) == '0';
 
     // Note: doesn't match Java which uses hints