diff --git a/ext/cog/cog.orc b/ext/cog/cog.orc
index 1b2c5820ef..dabb192b3f 100644
--- a/ext/cog/cog.orc
+++ b/ext/cog/cog.orc
@@ -386,7 +386,7 @@ convsuswb d1, t3
 .param 2 p3
 .param 2 p4
 .param 2 p5
-.param 2 p6
+#.param 2 p6
 .temp 2 t1
 .temp 2 t2
 #.temp 2 t3
@@ -402,8 +402,8 @@ mullw t2, t2, p3
 addw t1, t1, t2
 addw t1, t1, p4
 shrsw t1, t1, p5
-addw t1, t1, p6
-convsuswb d1, t1
+#addw t1, t1, p6
+convwb d1, t1
 
 
 
diff --git a/ext/cog/cogvirtframe.c b/ext/cog/cogvirtframe.c
index 21d0e4c4a3..836b1af946 100644
--- a/ext/cog/cogvirtframe.c
+++ b/ext/cog/cogvirtframe.c
@@ -1289,6 +1289,19 @@ cog_virt_frame_new_pack_RGB (CogFrame * vf)
   return virt_frame;
 }
 
+
+static const int cog_rgb_to_ycbcr_matrix_8bit_sdtv[] = {
+  66, 129, 25, 4096,
+  -38, -74, 112, 32768,
+  112, -94, -18, 32768,
+};
+
+static const int cog_rgb_to_ycbcr_matrix_8bit_hdtv[] = {
+  47, 157, 16, 4096,
+  -26, -87, 112, 32768,
+  112, -102, -10, 32768,
+};
+
 static void
 color_matrix_RGB_to_YCbCr (CogFrame * frame, void *_dest, int component, int i)
 {
@@ -1296,6 +1309,7 @@ color_matrix_RGB_to_YCbCr (CogFrame * frame, void *_dest, int component, int i)
   uint8_t *src1;
   uint8_t *src2;
   uint8_t *src3;
+  int *matrix = frame->virt_priv2;
 
   src1 = cog_virt_frame_get_line (frame->virt_frame1, 0, i);
   src2 = cog_virt_frame_get_line (frame->virt_frame1, 1, i);
@@ -1304,25 +1318,16 @@ color_matrix_RGB_to_YCbCr (CogFrame * frame, void *_dest, int component, int i)
   /* for RGB -> YUV */
   switch (component) {
     case 0:
-      /* m1 = 0.25679;
-       * m2 = 0.50413;
-       * m3 = 0.097906; */
       orc_matrix3_000_u8 (dest, src1, src2, src3,
-          66, 129, 25, 128, 8, 16, frame->width);
+          matrix[0], matrix[1], matrix[2], (16 << 8) + 128, 8, frame->width);
       break;
     case 1:
-      /* m1 = -0.14822;
-       * m2 = -0.29099;
-       * m3 = 0.43922; */
       orc_matrix3_000_u8 (dest, src1, src2, src3,
-          -37, -74, 112, 128, 8, 128, frame->width);
+          matrix[4], matrix[5], matrix[6], (128 << 8) + 128, 8, frame->width);
       break;
     case 2:
-      /* m1 = 0.43922;
-       * m2 = -0.36779;
-       * m3 = -0.071427; */
       orc_matrix3_000_u8 (dest, src1, src2, src3,
-          112, -94, 18, 128, 8, 128, frame->width);
+          matrix[8], matrix[9], matrix[10], (128 << 8) + 128, 8, frame->width);
       break;
     default:
       break;
@@ -1371,23 +1376,14 @@ color_matrix_YCbCr_to_RGB_6bit (CogFrame * frame, void *_dest, int component,
 
   switch (component) {
     case 0:
-      /* m1 = 1.1644;
-       * m2 = 0;
-       * m3 = 1.596; */
       orc_matrix2_u8 (dest, src1, src3, matrix[0], matrix[2], matrix[3] + 32,
           frame->width);
       break;
     case 1:
-      /* m1 = 1.1644;
-       * m2 = -0.39176;
-       * m3 = -0.81297; */
       orc_matrix3_u8 (dest, src1, src2, src3, matrix[4], matrix[5], matrix[6],
           matrix[7] + 32, frame->width);
       break;
     case 2:
-      /* m1 = 1.1644;
-       * m2 = 2.0172;
-       * m3 = 0; */
       orc_matrix2_u8 (dest, src1, src2,
           matrix[8], matrix[9], matrix[11] + 32, frame->width);
       break;
@@ -1412,24 +1408,14 @@ color_matrix_YCbCr_to_RGB_8bit (CogFrame * frame, void *_dest, int component,
 
   switch (component) {
     case 0:
-
-      /* m1 = 1.1644;
-       * m2 = 0;
-       * m3 = 1.596; */
       orc_matrix2_11_u8 (dest, src1, src3,
           matrix[0], matrix[2], 128, 8, frame->width);
       break;
     case 1:
-      /* m1 = 1.1644;
-       * m2 = -0.39176;
-       * m3 = -0.81297; */
       orc_matrix3_100_u8 (dest, src1, src2, src3,
           matrix[4], matrix[5], matrix[6], 128, 8, frame->width);
       break;
     case 2:
-      /* m1 = 1.1644;
-       * m2 = 2.0172;
-       * m3 = 0; */
       orc_matrix2_12_u8 (dest, src1, src2,
           matrix[8], matrix[9], 128, 8, frame->width);
       break;
@@ -1469,7 +1455,7 @@ cog_virt_frame_new_color_matrix_YCbCr_to_RGB (CogFrame * vf,
 
 CogFrame *
 cog_virt_frame_new_color_matrix_RGB_to_YCbCr (CogFrame * vf,
-    CogColorMatrix color_matrix)
+    CogColorMatrix color_matrix, int coefficient_bits)
 {
   CogFrame *virt_frame;
 
@@ -1477,7 +1463,11 @@ cog_virt_frame_new_color_matrix_RGB_to_YCbCr (CogFrame * vf,
       vf->width, vf->height);
   virt_frame->virt_frame1 = vf;
   virt_frame->render_line = color_matrix_RGB_to_YCbCr;
-  virt_frame->param1 = color_matrix;
+  if (color_matrix == COG_COLOR_MATRIX_HDTV) {
+    virt_frame->virt_priv2 = (void *) cog_rgb_to_ycbcr_matrix_8bit_hdtv;
+  } else {
+    virt_frame->virt_priv2 = (void *) cog_rgb_to_ycbcr_matrix_8bit_sdtv;
+  }
 
   return virt_frame;
 }
diff --git a/ext/cog/cogvirtframe.h b/ext/cog/cogvirtframe.h
index eca491446f..3895b4ea35 100644
--- a/ext/cog/cogvirtframe.h
+++ b/ext/cog/cogvirtframe.h
@@ -27,8 +27,8 @@ CogFrame *cog_virt_frame_new_pack_AYUV (CogFrame *vf);
 CogFrame *cog_virt_frame_new_pack_v216 (CogFrame *vf);
 CogFrame *cog_virt_frame_new_pack_v210 (CogFrame *vf);
 CogFrame *cog_virt_frame_new_pack_RGB (CogFrame *vf);
-CogFrame *cog_virt_frame_new_color_matrix_YCbCr_to_RGB (CogFrame *vf, CogColorMatrix color_matrix, int bits);
-CogFrame * cog_virt_frame_new_color_matrix_RGB_to_YCbCr (CogFrame * vf, CogColorMatrix color_matrix);
+CogFrame *cog_virt_frame_new_color_matrix_YCbCr_to_RGB (CogFrame *vf, CogColorMatrix color_matrix, int coefficient_bits);
+CogFrame * cog_virt_frame_new_color_matrix_RGB_to_YCbCr (CogFrame * vf, CogColorMatrix color_matrix, int coefficient_bits);
 CogFrame *cog_virt_frame_new_subsample (CogFrame *vf, CogFrameFormat format);
 
 CogFrame * cog_virt_frame_new_convert_u8 (CogFrame *vf);
diff --git a/ext/cog/generate_tables.c b/ext/cog/generate_tables.c
index a04946d9ea..224e5693ba 100644
--- a/ext/cog/generate_tables.c
+++ b/ext/cog/generate_tables.c
@@ -129,6 +129,57 @@ main (int argc, char *argv[])
     }
   }
 
+  {
+    int cm, bits;
+
+    for (cm = 0; cm < 2; cm++) {
+      for (bits = 8; bits <= 8; bits += 1) {
+
+        ColorMatrix matrix;
+
+        color_matrix_set_identity (&matrix);
+
+        color_matrix_scale_components (&matrix, (1 / 255.0), (1 / 255.0),
+            (1 / 255.0));
+
+        /* colour matrix, RGB -> YCbCr */
+        if (cm) {
+          color_matrix_RGB_to_YCbCr (&matrix, 0.2126, 0.0722);  /* HD */
+        } else {
+          color_matrix_RGB_to_YCbCr (&matrix, 0.2990, 0.1140);  /* SD */
+        }
+
+        /*
+         * We are now in YCbCr space
+         */
+
+        color_matrix_scale_components (&matrix, 219.0, 224.0, 224.0);
+
+        color_matrix_offset_components (&matrix, 16, 128, 128);
+
+        /* because we're doing 8-bit matrix coefficients */
+        color_matrix_scale_components (&matrix, 1 << bits, 1 << bits,
+            1 << bits);
+
+        g_print ("static const int cog_rgb_to_ycbcr_matrix_%dbit_%s[] = {\n",
+            bits, cm ? "hdtv" : "sdtv");
+        g_print ("  %d, %d, %d, %d,\n",
+            (int) rint (matrix.m[0][0]),
+            (int) rint (matrix.m[0][1]),
+            (int) rint (matrix.m[0][2]), (int) rint (matrix.m[0][3]));
+        g_print ("  %d, %d, %d, %d,\n",
+            (int) rint (matrix.m[1][0]),
+            (int) rint (matrix.m[1][1]),
+            (int) rint (matrix.m[1][2]), (int) rint (matrix.m[1][3]));
+        g_print ("  %d, %d, %d, %d,\n",
+            (int) rint (matrix.m[2][0]),
+            (int) rint (matrix.m[2][1]),
+            (int) rint (matrix.m[2][2]), (int) rint (matrix.m[2][3]));
+        g_print ("};\n");
+      }
+    }
+  }
+
 
   return 0;
 }
diff --git a/ext/cog/gstcogcolorspace.c b/ext/cog/gstcogcolorspace.c
index 1663a848fd..c076f5e0f2 100644
--- a/ext/cog/gstcogcolorspace.c
+++ b/ext/cog/gstcogcolorspace.c
@@ -445,7 +445,7 @@ gst_cogcolorspace_transform (GstBaseTransform * base_transform,
   if (gst_video_format_is_yuv (out_format) &&
       gst_video_format_is_rgb (in_format)) {
     frame = cog_virt_frame_new_color_matrix_RGB_to_YCbCr (frame,
-        compress->color_matrix);
+        compress->color_matrix, 8);
   }
 
   frame = cog_virt_frame_new_subsample (frame, new_subsample);
diff --git a/ext/cog/gstlogoinsert.c b/ext/cog/gstlogoinsert.c
index 9eb9141722..4aea9fa2e6 100644
--- a/ext/cog/gstlogoinsert.c
+++ b/ext/cog/gstlogoinsert.c
@@ -265,7 +265,8 @@ gst_logoinsert_transform_ip (GstBaseTransform * base_transform, GstBuffer * buf)
     li->alpha_frame = cog_frame_realize (f);
 
     f = cog_virt_frame_new_unpack (cog_frame_ref (li->ayuv_frame));
-    f = cog_virt_frame_new_color_matrix_RGB_to_YCbCr (f, COG_COLOR_MATRIX_SDTV);
+    f = cog_virt_frame_new_color_matrix_RGB_to_YCbCr (f, COG_COLOR_MATRIX_SDTV,
+        8);
     f = cog_virt_frame_new_subsample (f, frame->format);
     li->overlay_frame = cog_frame_realize (f);
   }