From cd540a333e48fea429c7b706ca12d7ba94994ec9 Mon Sep 17 00:00:00 2001
From: Nuo Mi <nuomi2021@gmail.com>
Date: Wed, 27 Mar 2024 21:00:57 +0800
Subject: [PATCH] avcodec/vvcdec: NoBackwardPredFlag, only check active
 pictures

see "8.3.6 Decoding process for collocated picture and no backward prediction"
---
 libavcodec/vvc/vvc_mvs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vvc/vvc_mvs.c b/libavcodec/vvc/vvc_mvs.c
index 6398fd3571..cf92202b5b 100644
--- a/libavcodec/vvc/vvc_mvs.c
+++ b/libavcodec/vvc/vvc_mvs.c
@@ -125,7 +125,7 @@ int ff_vvc_no_backward_pred_flag(const VVCLocalContext *lc)
     const RefPicList *rpl = lc->sc->rpl;
 
     for (j = 0; j < 2; j++) {
-        for (i = 0; i < rpl[j].nb_refs; i++) {
+        for (i = 0; i < lc->sc->sh.r->num_ref_idx_active[j]; i++) {
             if (rpl[j].list[i] > lc->fc->ps.ph.poc) {
                 check_diffpicount++;
                 break;