diff --git a/src/video_codec.c b/src/video_codec.c
index 02bb7aff1..d64612776 100644
--- a/src/video_codec.c
+++ b/src/video_codec.c
@@ -612,6 +612,24 @@ static void vc_deinterlace_unaligned(unsigned char *src, long src_linesize, int
 }
 #endif
 
+/**
+ * Extended version of vc_deinterlace(). The former version was in-place only.
+ * This allows to output to different buffer.
+ */
+void vc_deinterlace_ex(unsigned char *src, size_t src_linesize, unsigned char *dst, size_t dst_pitch, size_t lines)
+{
+        for (size_t y = 0; y < lines; y += 2) {
+                for (size_t x = 0; x < src_linesize; ++x) {
+                        int val = (*src + src[src_linesize] + 1) >> 1;
+                        *dst = dst[dst_pitch] = val;
+                        src++;
+                        dst++;
+                }
+                src += src_linesize;
+                dst += dst_pitch;
+        }
+}
+
 /**
  * @brief Converts v210 to UYVY
  * @param[out] dst     4-byte aligned output buffer where UYVY will be stored
diff --git a/src/video_codec.h b/src/video_codec.h
index 4567a8f71..f2327fa9a 100644
--- a/src/video_codec.h
+++ b/src/video_codec.h
@@ -93,6 +93,7 @@ bool codec_is_in_set(codec_t codec, codec_t *set) ATTRIBUTE(pure);
 int codec_is_const_size(codec_t codec) ATTRIBUTE(pure);
 
 void vc_deinterlace(unsigned char *src, long src_linesize, int lines);
+void vc_deinterlace_ex(unsigned char *src, size_t src_linesize, unsigned char *dst, size_t dst_pitch, size_t lines);
 void vc_copylineDVS10(unsigned char *dst, const unsigned char *src, int dst_len);
 void vc_copylinev210(unsigned char *dst, const unsigned char *src, int dst_len);
 void vc_copylineYUYV(unsigned char *dst, const unsigned char *src, int dst_len);