diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index 4762f584dc..b73a1f2ab3 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -705,6 +705,31 @@ static int swscale(SwsContext *c, const uint8_t *src[],
     return dstY - lastDstY;
 }
 
+av_cold void ff_sws_init_range_convert(SwsContext *c)
+{
+    c->lumConvertRange = NULL;
+    c->chrConvertRange = NULL;
+    if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {
+        if (c->dstBpc <= 14) {
+            if (c->srcRange) {
+                c->lumConvertRange = lumRangeFromJpeg_c;
+                c->chrConvertRange = chrRangeFromJpeg_c;
+            } else {
+                c->lumConvertRange = lumRangeToJpeg_c;
+                c->chrConvertRange = chrRangeToJpeg_c;
+            }
+        } else {
+            if (c->srcRange) {
+                c->lumConvertRange = lumRangeFromJpeg16_c;
+                c->chrConvertRange = chrRangeFromJpeg16_c;
+            } else {
+                c->lumConvertRange = lumRangeToJpeg16_c;
+                c->chrConvertRange = chrRangeToJpeg16_c;
+            }
+        }
+    }
+}
+
 static av_cold void sws_init_swscale(SwsContext *c)
 {
     enum AVPixelFormat srcFormat = c->srcFormat;
@@ -731,27 +756,7 @@ static av_cold void sws_init_swscale(SwsContext *c)
                                                  : hScale16To15_c;
     }
 
-    c->lumConvertRange = NULL;
-    c->chrConvertRange = NULL;
-    if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {
-        if (c->dstBpc <= 14) {
-            if (c->srcRange) {
-                c->lumConvertRange = lumRangeFromJpeg_c;
-                c->chrConvertRange = chrRangeFromJpeg_c;
-            } else {
-                c->lumConvertRange = lumRangeToJpeg_c;
-                c->chrConvertRange = chrRangeToJpeg_c;
-            }
-        } else {
-            if (c->srcRange) {
-                c->lumConvertRange = lumRangeFromJpeg16_c;
-                c->chrConvertRange = chrRangeFromJpeg16_c;
-            } else {
-                c->lumConvertRange = lumRangeToJpeg16_c;
-                c->chrConvertRange = chrRangeToJpeg16_c;
-            }
-        }
-    }
+    ff_sws_init_range_convert(c);
 
     if (!(isGray(srcFormat) || isGray(c->dstFormat) ||
           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))
diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index 0b3e687294..bb8847d0f7 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -617,6 +617,8 @@ void ff_yuv2rgb_init_tables_ppc(SwsContext *c, const int inv_table[4],
 void updateMMXDitherTables(SwsContext *c, int dstY, int lumBufIndex, int chrBufIndex,
                            int lastInLumBuf, int lastInChrBuf);
 
+av_cold void ff_sws_init_range_convert(SwsContext *c);
+
 SwsFunc ff_yuv2rgb_init_x86(SwsContext *c);
 SwsFunc ff_yuv2rgb_init_ppc(SwsContext *c);
 SwsFunc ff_yuv2rgb_init_bfin(SwsContext *c);