diff --git a/libavcodec/mpeg_er.c b/libavcodec/mpeg_er.c
index 3d90582db3..dd87ae9cc9 100644
--- a/libavcodec/mpeg_er.c
+++ b/libavcodec/mpeg_er.c
@@ -58,3 +58,74 @@ void ff_mpeg_er_frame_start(MpegEncContext *s)
 
     ff_er_frame_start(er);
 }
+
+static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
+                              int (*mv)[2][4][2], int mb_x, int mb_y,
+                              int mb_intra, int mb_skipped)
+{
+    MpegEncContext *s = opaque;
+
+    s->mv_dir     = mv_dir;
+    s->mv_type    = mv_type;
+    s->mb_intra   = mb_intra;
+    s->mb_skipped = mb_skipped;
+    s->mb_x       = mb_x;
+    s->mb_y       = mb_y;
+    memcpy(s->mv, mv, sizeof(*mv));
+
+    ff_init_block_index(s);
+    ff_update_block_index(s);
+
+    s->bdsp.clear_blocks(s->block[0]);
+
+    s->dest[0] = s->current_picture.f->data[0] +
+                 s->mb_y * 16 * s->linesize +
+                 s->mb_x * 16;
+    s->dest[1] = s->current_picture.f->data[1] +
+                 s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
+                 s->mb_x * (16 >> s->chroma_x_shift);
+    s->dest[2] = s->current_picture.f->data[2] +
+                 s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
+                 s->mb_x * (16 >> s->chroma_x_shift);
+
+    if (ref)
+        av_log(s->avctx, AV_LOG_DEBUG,
+               "Interlaced error concealment is not fully implemented\n");
+    ff_mpv_decode_mb(s, s->block);
+}
+
+int ff_mpeg_er_init(MpegEncContext *s)
+{
+    ERContext *er = &s->er;
+    int mb_array_size = s->mb_height * s->mb_stride;
+    int i;
+
+    er->avctx       = s->avctx;
+
+    er->mb_index2xy = s->mb_index2xy;
+    er->mb_num      = s->mb_num;
+    er->mb_width    = s->mb_width;
+    er->mb_height   = s->mb_height;
+    er->mb_stride   = s->mb_stride;
+    er->b8_stride   = s->b8_stride;
+
+    er->er_temp_buffer     = av_malloc(s->mb_height * s->mb_stride);
+    er->error_status_table = av_mallocz(mb_array_size);
+    if (!er->er_temp_buffer || !er->error_status_table)
+        goto fail;
+
+    er->mbskip_table  = s->mbskip_table;
+    er->mbintra_table = s->mbintra_table;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
+        er->dc_val[i] = s->dc_val[i];
+
+    er->decode_mb = mpeg_er_decode_mb;
+    er->opaque    = s;
+
+    return 0;
+fail:
+    av_freep(&er->er_temp_buffer);
+    av_freep(&er->error_status_table);
+    return AVERROR(ENOMEM);
+}
diff --git a/libavcodec/mpeg_er.h b/libavcodec/mpeg_er.h
index bd74fbb0c8..bb627a4d06 100644
--- a/libavcodec/mpeg_er.h
+++ b/libavcodec/mpeg_er.h
@@ -21,6 +21,7 @@
 
 #include "mpegvideo.h"
 
+int ff_mpeg_er_init(MpegEncContext *s);
 void ff_mpeg_er_frame_start(MpegEncContext *s);
 
 #endif /* AVCODEC_MPEG_ER_H */
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 2b01d7bb72..a3ff7460e9 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -39,6 +39,7 @@
 #include "idctdsp.h"
 #include "internal.h"
 #include "mathops.h"
+#include "mpeg_er.h"
 #include "mpegutils.h"
 #include "mpegvideo.h"
 #include "mpegvideodata.h"
@@ -256,34 +257,6 @@ static void dct_unquantize_h263_inter_c(MpegEncContext *s,
     }
 }
 
-static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
-                              int (*mv)[2][4][2],
-                              int mb_x, int mb_y, int mb_intra, int mb_skipped)
-{
-    MpegEncContext *s = opaque;
-
-    s->mv_dir     = mv_dir;
-    s->mv_type    = mv_type;
-    s->mb_intra   = mb_intra;
-    s->mb_skipped = mb_skipped;
-    s->mb_x       = mb_x;
-    s->mb_y       = mb_y;
-    memcpy(s->mv, mv, sizeof(*mv));
-
-    ff_init_block_index(s);
-    ff_update_block_index(s);
-
-    s->bdsp.clear_blocks(s->block[0]);
-
-    s->dest[0] = s->current_picture.f->data[0] + (s->mb_y *  16                       * s->linesize)   + s->mb_x *  16;
-    s->dest[1] = s->current_picture.f->data[1] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
-    s->dest[2] = s->current_picture.f->data[2] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
-
-    if (ref)
-        av_log(s->avctx, AV_LOG_DEBUG,
-               "Interlaced error concealment is not fully implemented\n");
-    ff_mpv_decode_mb(s, s->block);
-}
 
 static void gray16(uint8_t *dst, const uint8_t *src, ptrdiff_t linesize, int h)
 {
@@ -687,42 +660,6 @@ void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
     s->codec_tag          = avpriv_toupper4(avctx->codec_tag);
 }
 
-static int init_er(MpegEncContext *s)
-{
-    ERContext *er = &s->er;
-    int mb_array_size = s->mb_height * s->mb_stride;
-    int i;
-
-    er->avctx       = s->avctx;
-
-    er->mb_index2xy = s->mb_index2xy;
-    er->mb_num      = s->mb_num;
-    er->mb_width    = s->mb_width;
-    er->mb_height   = s->mb_height;
-    er->mb_stride   = s->mb_stride;
-    er->b8_stride   = s->b8_stride;
-
-    er->er_temp_buffer     = av_malloc(s->mb_height * s->mb_stride);
-    er->error_status_table = av_mallocz(mb_array_size);
-    if (!er->er_temp_buffer || !er->error_status_table)
-        goto fail;
-
-    er->mbskip_table  = s->mbskip_table;
-    er->mbintra_table = s->mbintra_table;
-
-    for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
-        er->dc_val[i] = s->dc_val[i];
-
-    er->decode_mb = mpeg_er_decode_mb;
-    er->opaque    = s;
-
-    return 0;
-fail:
-    av_freep(&er->er_temp_buffer);
-    av_freep(&er->error_status_table);
-    return AVERROR(ENOMEM);
-}
-
 /**
  * Initialize and allocates MpegEncContext fields dependent on the resolution.
  */
@@ -841,7 +778,7 @@ static int init_context_frame(MpegEncContext *s)
     FF_ALLOCZ_OR_GOTO(s->avctx, s->mbskip_table, mb_array_size + 2, fail);
     // Note the + 1 is for  a quicker mpeg4 slice_end detection
 
-    return init_er(s);
+    return ff_mpeg_er_init(s);
 fail:
     return AVERROR(ENOMEM);
 }