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in repository ffmpeg.

commit e1a65fe178280b196b40688eb90b72d7eb63f2f9
Author:     Julius Bairaktaris <[email protected]>
AuthorDate: Mon Sep 28 07:29:03 2026 +0200
Commit:     michaelni <[email protected]>
CommitDate: Mon Oct 19 12:02:10 2026 +0000

    avcodec/av1dec: take the discard flag from the packet that shows a frame
    
    A frame coded with show_frame=0 takes AV_FRAME_FLAG_DISCARD from the
    packet that coded it. When show_existing_frame outputs it from a packet
    that is not discarded, the frame is still dropped. Take the flag from
    the showing packet, as is already done for pts and pkt_dts. MP4 edit
    lists and the trim bsf's preroll option produce such discarded leading
    packets.
    
    Assisted-by: Claude Opus 5.5
    Signed-off-by: Julius Bairaktaris <[email protected]>
---
 libavcodec/av1dec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index 6e15590193..5f06dd1467 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -1171,6 +1171,10 @@ static int set_output_frame(AVCodecContext *avctx, 
AVFrame *frame)
 
     frame->pts = pkt->pts;
     frame->pkt_dts = pkt->dts;
+    if (pkt->flags & AV_PKT_FLAG_DISCARD)
+        frame->flags |= AV_FRAME_FLAG_DISCARD;
+    else
+        frame->flags &= ~AV_FRAME_FLAG_DISCARD;
 
     av_packet_unref(pkt);
 

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