From fec686145e71c1f110c84894a4ee1d21fbaeedf4 Mon Sep 17 00:00:00 2001
From: Seungha Yang <seungha@centricular.com>
Date: Sun, 15 Nov 2020 03:41:27 +0900
Subject: [PATCH] codecs: h264decoder: Fix MMCO type 1 for interlaced stream

If field_pic_flag of current picture is equal to zero,
both field of reference field pair should be marked as
"unused for reference"

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1810>
---
 gst-libs/gst/codecs/gsth264picture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gst-libs/gst/codecs/gsth264picture.c b/gst-libs/gst/codecs/gsth264picture.c
index 9f8bf76b7d..f215200b52 100644
--- a/gst-libs/gst/codecs/gsth264picture.c
+++ b/gst-libs/gst/codecs/gsth264picture.c
@@ -836,7 +836,7 @@ gst_h264_dpb_perform_memory_management_control_operation (GstH264Dpb * dpb,
       other = gst_h264_dpb_get_short_ref_by_pic_num (dpb, pic_num_x);
       if (other) {
         gst_h264_picture_set_reference (other,
-            GST_H264_PICTURE_REF_NONE, FALSE);
+            GST_H264_PICTURE_REF_NONE, GST_H264_PICTURE_IS_FRAME (picture));
         GST_TRACE ("MMCO-1: unmark short-term ref picture %p, (poc %d)",
             other, other->pic_order_cnt);
       } else {