diff --git a/gst-libs/gst/codecparsers/gsth264parser.c b/gst-libs/gst/codecparsers/gsth264parser.c
index 2f18ffd383..572a28dedf 100644
--- a/gst-libs/gst/codecparsers/gsth264parser.c
+++ b/gst-libs/gst/codecparsers/gsth264parser.c
@@ -1938,13 +1938,11 @@ gst_h264_parser_parse_sei (GstH264NalParser * nalparser, GstH264NalUnit * nalu,
       sei->payloadType, payload_size);
 
   if (sei->payloadType == GST_H264_SEI_BUF_PERIOD) {
-    /* Set the nal reader size properly */
-    nr.size = payload_size;
+    /* size not set; might depend on emulation_prevention_three_byte */
     res = gst_h264_parser_parse_buffering_period (nalparser,
         &sei->buffering_period, &nr);
   } else if (sei->payloadType == GST_H264_SEI_PIC_TIMING) {
-    /* Set the nal reader size properly */
-    nr.size = payload_size;
+    /* size not set; might depend on emulation_prevention_three_byte */
     res = gst_h264_parser_parse_pic_timing (nalparser, &sei->pic_timing, &nr);
   } else
     res = GST_H264_PARSER_OK;
diff --git a/gst/videoparsers/gsth264parse.c b/gst/videoparsers/gsth264parse.c
index 1723826f68..4ba67e133b 100644
--- a/gst/videoparsers/gsth264parse.c
+++ b/gst/videoparsers/gsth264parse.c
@@ -520,7 +520,7 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
         if (h264parse->format == GST_H264_PARSE_FORMAT_AVC)
           h264parse->sei_pos = gst_adapter_available (h264parse->frame_out);
         else
-          h264parse->sei_pos = nalu->offset - 4;
+          h264parse->sei_pos = nalu->sc_offset;
         GST_DEBUG_OBJECT (h264parse, "marking SEI in frame at offset %d",
             h264parse->sei_pos);
       }
@@ -563,7 +563,7 @@ gst_h264_parse_process_nal (GstH264Parse * h264parse, GstH264NalUnit * nalu)
         if (h264parse->format == GST_H264_PARSE_FORMAT_AVC)
           h264parse->idr_pos = gst_adapter_available (h264parse->frame_out);
         else
-          h264parse->idr_pos = nalu->offset - 4;
+          h264parse->idr_pos = nalu->sc_offset;
         GST_DEBUG_OBJECT (h264parse, "marking IDR in frame at offset %d",
             h264parse->idr_pos);
       }