Fixes ORF1HD.Demo-Loop.720p.DD5.1.mkv from x264 samples.
---
libavcodec/h264.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index e0ab15d..4a9e6d7 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -4078,7 +4078,8 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
h->mb_field_decoding_flag= s->picture_structure != PICT_FRAME;
if(h0->current_slice == 0){
- if((h->prev_frame_num+1)%(1<<h->sps.log2_max_frame_num) < (h->frame_num - h->sps.ref_frame_count))
+ if(h->frame_num != h->prev_frame_num &&
+ (h->prev_frame_num+1)%(1<<h->sps.log2_max_frame_num) < (h->frame_num - h->sps.ref_frame_count))
h->prev_frame_num = h->frame_num - h->sps.ref_frame_count - 1;
while(h->frame_num != h->prev_frame_num &&
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