[FFmpeg-devel] [PATCH] avcodec/h264: ignore POC when flag is set (PR #20262)

[Kevin Wang]

PR #20262 opened by Kevin Wang (kevmo314)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20262
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20262.patch

When the flag AV_CODEC_FLAG_OUTPUT_CORRUPT or AV_CODEC_FLAG2_SHOW_ALL
is set, ignore any out of order POC's as they may still be valid
frames.

Signed-off-by: Kevin Wang <kevmo314 at gmail.com>


From 2e24af0e19fd29fe16d544bfe65f21a278787a27 Mon Sep 17 00:00:00 2001
From: kevmo314 <kevmo314 at gmail.com>
Date: Sun, 17 Aug 2025 02:49:55 +0000
Subject: [PATCH] avcodec/h264: ignore POC when flag is set

When the flag AV_CODEC_FLAG_OUTPUT_CORRUPT or AV_CODEC_FLAG2_SHOW_ALL
is set, ignore any out of order POC's as they may still be valid
frames.

Signed-off-by: kevmo314 <kevmo314 at gmail.com>
---
 libavcodec/h264_slice.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 7e53e38cca..14650aca91 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1352,7 +1352,8 @@ static int h264_select_output_frame(H264Context *h)
             out_idx = i;
         }
     if (h->avctx->has_b_frames == 0 &&
-        ((h->delayed_pic[0]->f->flags & AV_FRAME_FLAG_KEY) || h->delayed_pic[0]->mmco_reset))
+        // Check if we should ignore the output order and output the frame
+        ((h->delayed_pic[0]->f->flags & AV_FRAME_FLAG_KEY) || h->delayed_pic[0]->mmco_reset || h->avctx->flags & (AV_CODEC_FLAG_OUTPUT_CORRUPT | AV_CODEC_FLAG2_SHOW_ALL)))
         h->next_outputed_poc = INT_MIN;
     out_of_order = out->poc < h->next_outputed_poc;
 
-- 
2.49.1