diff --git a/include/libyuv/row.h b/include/libyuv/row.h
index 736d2f9bc..98e332319 100644
--- a/include/libyuv/row.h
+++ b/include/libyuv/row.h
@@ -634,7 +634,7 @@ extern "C" {
 #define HAS_COPYROW_SVE2
 #define HAS_DIVIDEROW_16_SVE2
 #define HAS_HALFFLOATROW_SVE2
-// #define HAS_HALFMERGEUVROW_SVE2  // Disabled: Bug 546962730
+#define HAS_HALFMERGEUVROW_SVE2
 // #define HAS_HALFROW_16TO8_SVE2  // Disabled: NEON version is faster for 128 bit vectors.
 // #define HAS_HALFWIDTHROW_16TO8_SVE2  // Disabled: NEON version is faster for 128 bit vectors.
 #define HAS_I210ALPHATOARGBROW_SVE2
diff --git a/source/planar_functions.cc b/source/planar_functions.cc
index b7ae2a3e4..f03c8fa84 100644
--- a/source/planar_functions.cc
+++ b/source/planar_functions.cc
@@ -5921,7 +5921,10 @@ void HalfMergeUVPlane(const uint8_t* src_u,
   }
 #endif
 #if defined(HAS_HALFMERGEUVROW_SVE2)
-  if (TestCpuFlag(kCpuHasSVE2)) {
+  // The average of two values must be retained for the final odd element if
+  // present. Existing code just handles this by falling back to the C
+  // implementation, so mirror that for SVE2 as well.
+  if (TestCpuFlag(kCpuHasSVE2) && IS_ALIGNED(width, 2)) {
     HalfMergeUVRow = HalfMergeUVRow_SVE2;
   }
 #endif
diff --git a/source/row_sve.cc b/source/row_sve.cc
index 4aa66b1b2..f8fa227a6 100644
--- a/source/row_sve.cc
+++ b/source/row_sve.cc
@@ -1151,12 +1151,17 @@ void HalfMergeUVRow_SVE2(const uint8_t* src_u,
       "incb     %[src_u1]                               \n"
       "incb     %[src_v]                                \n"
       "incb     %[src_v1]                               \n"
-      "urhadd   z1.b, p0/m, z1.b, z2.b                  \n"
-      "urhadd   z3.b, p0/m, z3.b, z4.b                  \n"
-      "mov      z2.b, p0/m, z3.b                        \n"
+      "uaddlb   z5.h, z1.b, z2.b                        \n"
+      "uaddlb   z6.h, z3.b, z4.b                        \n"
+      "uaddlt   z1.h, z1.b, z2.b                        \n"
+      "uaddlt   z3.h, z3.b, z4.b                        \n"
+      "add      z1.h, z1.h, z5.h                        \n"
+      "add      z3.h, z3.h, z6.h                        \n"
+      "rshrnb   z1.b, z1.h, #2                          \n"
+      "rshrnt   z1.b, z3.h, #2                          \n"
       "subs     %w[width], %w[width], %w[vl]            \n"
-      "st2b     {z1.b, z2.b}, p0, [%[dst_uv]]           \n"
-      "incb     %[dst_uv], all, mul #2                  \n"
+      "st1b     {z1.b}, p0, [%[dst_uv]]                 \n"
+      "incb     %[dst_uv]                               \n"
       "b.ge     1b                                      \n"
 
       "2:                                               \n"
@@ -1168,10 +1173,15 @@ void HalfMergeUVRow_SVE2(const uint8_t* src_u,
       "ld1b     {z2.b}, p0/z, [%[src_u1]]               \n"
       "ld1b     {z3.b}, p0/z, [%[src_v]]                \n"
       "ld1b     {z4.b}, p0/z, [%[src_v1]]               \n"
-      "urhadd   z1.b, p0/m, z1.b, z2.b                  \n"
-      "urhadd   z3.b, p0/m, z3.b, z4.b                  \n"
-      "mov      z2.b, p0/m, z3.b                        \n"
-      "st2b     {z1.b, z2.b}, p0, [%[dst_uv]]           \n"
+      "uaddlb   z5.h, z1.b, z2.b                        \n"
+      "uaddlb   z6.h, z3.b, z4.b                        \n"
+      "uaddlt   z1.h, z1.b, z2.b                        \n"
+      "uaddlt   z3.h, z3.b, z4.b                        \n"
+      "add      z1.h, z1.h, z5.h                        \n"
+      "add      z3.h, z3.h, z6.h                        \n"
+      "rshrnb   z1.b, z1.h, #2                          \n"
+      "rshrnt   z1.b, z3.h, #2                          \n"
+      "st1b     {z1.b}, p0, [%[dst_uv]]                 \n"
 
       "99:                                              \n"
       : [src_u] "+r"(src_u),      // %[src_u]
@@ -1182,7 +1192,7 @@ void HalfMergeUVRow_SVE2(const uint8_t* src_u,
         [width] "+r"(width),      // %[width]
         [vl] "=&r"(vl)            // %[vl]
       :
-      : "cc", "memory", "z1", "z2", "z3", "z4", "p0");
+      : "cc", "memory", "z1", "z2", "z3", "z4", "z5", "z6", "p0");
 }
 
 void CopyRow_SVE2(const uint8_t* src, uint8_t* dst, int width) {