[FFmpeg-devel] [PR] avfilter/framepool: add a few padding lines by aligning height (PR #21740)

[James Almer via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21740 opened by James Almer (jamrial)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21740
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21740.patch

Fixes segfaults when handling files with odd chroma subsampled dimensions in some scenarios like using the hstack filter.

./ffmpeg -lavfi testsrc=s=255x31,format=yuv420p -vframes 1 -y in.jpg && \
./ffmpeg -i in.jpg -i in.jpg -i in.jpg -i in.jpg -filter_complex "xstack=inputs=4:grid=2x2" -y out.png

Fixes issue #21739.


>From 2befc9f9d8678e6c8e037eb83ea11b55fd1f2025 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Thu, 12 Feb 2026 12:20:04 -0300
Subject: [PATCH] avfilter/framepool: add a few padding lines by aligning
 height

Fixes segfaults when handling files with odd chroma subsampled dimensions in
some scenarios like using the hstack filter.

./ffmpeg -lavfi testsrc=s=255x31,format=yuv420p -vframes 1 -y in.jpg && \
./ffmpeg -i in.jpg -i in.jpg -i in.jpg -i in.jpg -filter_complex "xstack=inputs=4:grid=2x2" -y out.png

Fixes issue #21739.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavfilter/framepool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/framepool.c b/libavfilter/framepool.c
index 1a1fc0de1e..10a9b6cf27 100644
--- a/libavfilter/framepool.c
+++ b/libavfilter/framepool.c
@@ -92,7 +92,7 @@ FFFramePool *ff_frame_pool_video_init(AVBufferRef* (*alloc)(size_t size),
         linesizes[i] = pool->linesize[i];
 
     if (av_image_fill_plane_sizes(sizes, pool->format,
-                                  pool->height,
+                                  FFALIGN(pool->height, align),
                                   linesizes) < 0) {
         goto fail;
     }
-- 
2.52.0

_______________________________________________
ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org
To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org