diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 86e77567d393cdc732558ca5f19a6efb5a08adfa..750229f1c5a964da2824904d598267ad735055db 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -971,7 +971,8 @@ fail:
     return -1; // free_tables will clean up for us
 }
 
-static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size);
+static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
+                            int parse_extradata);
 
 static av_cold void common_init(H264Context *h)
 {
@@ -1027,7 +1028,7 @@ static int ff_h264_decode_extradata_internal(H264Context *h, const uint8_t *buf,
             nalsize = AV_RB16(p) + 2;
             if(nalsize > size - (p-buf))
                 return -1;
-            if (decode_nal_units(h, p, nalsize) < 0) {
+            if (decode_nal_units(h, p, nalsize, 1) < 0) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Decoding sps %d from avcC failed\n", i);
                 return -1;
@@ -1040,7 +1041,7 @@ static int ff_h264_decode_extradata_internal(H264Context *h, const uint8_t *buf,
             nalsize = AV_RB16(p) + 2;
             if(nalsize > size - (p-buf))
                 return -1;
-            if (decode_nal_units(h, p, nalsize) < 0) {
+            if (decode_nal_units(h, p, nalsize, 1) < 0) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Decoding pps %d from avcC failed\n", i);
                 return -1;
@@ -1051,7 +1052,7 @@ static int ff_h264_decode_extradata_internal(H264Context *h, const uint8_t *buf,
         h->nal_length_size = (buf[4] & 0x03) + 1;
     } else {
         h->is_avc = 0;
-        if (decode_nal_units(h, buf, size) < 0)
+        if (decode_nal_units(h, buf, size, 1) < 0)
             return -1;
     }
     return size;
@@ -3778,7 +3779,8 @@ static int execute_decode_slices(H264Context *h, int context_count)
     return 0;
 }
 
-static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
+static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
+                            int parse_extradata)
 {
     MpegEncContext *const s     = &h->s;
     AVCodecContext *const avctx = s->avctx;
@@ -3922,6 +3924,17 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
                 continue;
 
 again:
+            /* Ignore every NAL unit type except PPS and SPS during extradata
+             * parsing. Decoding slices is not possible in codec init
+             * with frame-mt */
+            if (parse_extradata && HAVE_THREADS &&
+                (s->avctx->active_thread_type & FF_THREAD_FRAME) &&
+                (hx->nal_unit_type != NAL_PPS &&
+                 hx->nal_unit_type != NAL_SPS)) {
+                av_log(avctx, AV_LOG_INFO, "Ignoring NAL unit %d during "
+                       "extradata parsing\n", hx->nal_unit_type);
+                hx->nal_unit_type = NAL_FF_IGNORE;
+            }
             err = 0;
 
             if (h->decoding_extradata) {
@@ -4083,6 +4096,8 @@ again:
             case NAL_SPS_EXT:
             case NAL_AUXILIARY_SLICE:
                 break;
+            case NAL_FF_IGNORE:
+                break;
             default:
                 av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
                        hx->nal_unit_type, bit_length);
@@ -4201,7 +4216,7 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     }
 not_extra:
 
-    buf_index = decode_nal_units(h, buf, buf_size);
+    buf_index = decode_nal_units(h, buf, buf_size, 0);
     if (buf_index < 0)
         return -1;
 
diff --git a/libavcodec/h264.h b/libavcodec/h264.h
index bea6e22ecac675aa9cb1b37fba986aac026a1ac7..2be4809a16e853f4b582e74c7b672af572b8aa9c 100644
--- a/libavcodec/h264.h
+++ b/libavcodec/h264.h
@@ -115,7 +115,8 @@ enum {
     NAL_END_STREAM,
     NAL_FILLER_DATA,
     NAL_SPS_EXT,
-    NAL_AUXILIARY_SLICE = 19
+    NAL_AUXILIARY_SLICE = 19,
+    NAL_FF_IGNORE       = 0xff0f001,
 };
 
 /**