[FFmpeg-devel] [PR] fftools/ffmpeg_filter: skip autoscale for hardware format (PR #22262)

[Zhao Zhili via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #22262 opened by Zhao Zhili (quink)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22262
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22262.patch

This fix failure:
ffmpeg -hwaccel cuda -hwaccel_output_format cuda \
  -i The_Beauty_of_Earth-1.mp4 \
  -vf scale_cuda=2880:1440 \
  -c:v hevc_nvenc \
  -pix_fmt cuda \
  -b:v 8M -c:a copy \
  -y test_scale.mp4

> Reconfiguring filter graph because hwaccel changed
> Impossible to convert between the formats supported by the filter
> 'Parsed_scale_cuda_0' and the filter 'auto_scale_0'.
> Error reinitializing filters!

Signed-off-by: Zhao Zhili <quinkblack@foxmail.com>


>From 74e751fa28c73abc4640599fe5eecd23bf622b42 Mon Sep 17 00:00:00 2001
From: Zhao Zhili <quinkblack@foxmail.com>
Date: Sun, 8 Feb 2026 14:28:29 +0800
Subject: [PATCH] fftools/ffmpeg_filter: skip autoscale for hardware format

This fix failure:
ffmpeg -hwaccel cuda -hwaccel_output_format cuda \
  -i The_Beauty_of_Earth-1.mp4 \
  -vf scale_cuda=2880:1440 \
  -c:v hevc_nvenc \
  -pix_fmt cuda \
  -b:v 8M -c:a copy \
  -y test_scale.mp4

> Reconfiguring filter graph because hwaccel changed
> Impossible to convert between the formats supported by the filter
> 'Parsed_scale_cuda_0' and the filter 'auto_scale_0'.
> Error reinitializing filters!

Signed-off-by: Zhao Zhili <quinkblack@foxmail.com>
---
 fftools/ffmpeg_filter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 765b65d0ec..9418a974cc 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -1681,7 +1681,10 @@ static int configure_output_video_filter(FilterGraphPriv *fgp, AVFilterGraph *gr
         av_frame_side_data_remove(&ofp->side_data, &ofp->nb_side_data, AV_FRAME_DATA_DISPLAYMATRIX);
     }
 
-    if ((ofp->width || ofp->height) && (ofp->flags & OFILTER_FLAG_AUTOSCALE)) {
+    if ((ofp->width || ofp->height) && (ofp->flags & OFILTER_FLAG_AUTOSCALE) &&
+        // skip add scale for hardware format
+        !(ofp->format != AV_PIX_FMT_NONE &&
+          av_pix_fmt_desc_get(ofp->format)->flags & AV_PIX_FMT_FLAG_HWACCEL)) {
         char args[255];
         AVFilterContext *filter;
         const AVDictionaryEntry *e = NULL;
-- 
2.52.0

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