[FFmpeg-devel] [PATCH] libavfilter/vf_scale_npp: fix yuva420p -> yuv420p conversion

[FFmpeg-devel] [PATCH] libavfilter/vf_scale_npp: fix yuva420p -> yuv420p conversion

[Jorge Estrada]

When converting from yuva420p to yuv420p the resize loop would try to access an output plane that did not exist.
Added a check for the output planes existence.

Example cmd: ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i example.mp4 -vf scale_npp=format=yuva420p,scale_npp=format=yuv420p -c:v h264_nvenc -f null -

Signed-off-by: Jorge Estrada <jestrada.list@gmail.com>
---
 libavfilter/vf_scale_npp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_scale_npp.c b/libavfilter/vf_scale_npp.c
index 1b1b7b9fc9..5387bf9c7a 100644
--- a/libavfilter/vf_scale_npp.c
+++ b/libavfilter/vf_scale_npp.c
@@ -721,7 +721,7 @@ static int nppscale_resize(AVFilterContext *ctx, NPPScaleStageContext *stage,
     NppStatus err;
     int i;
 
-    for (i = 0; i < FF_ARRAY_ELEMS(stage->planes_in) && i < FF_ARRAY_ELEMS(in->data) && in->data[i]; i++) {
+    for (i = 0; i < FF_ARRAY_ELEMS(stage->planes_in) && i < FF_ARRAY_ELEMS(in->data) && in->data[i] && out->data[i]; i++) {
         int iw = stage->planes_in[i].width;
         int ih = stage->planes_in[i].height;
         int ow = stage->planes_out[i].width;
-- 
2.34.1

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Re: [FFmpeg-devel] [PATCH] libavfilter/vf_scale_npp: fix yuva420p -> yuv420p conversion

[Jorge Estrada]

ping

On Sat, Jul 19, 2025 at 3:32 PM Jorge Estrada <jestrada.list@gmail.com>
wrote:

> When converting from yuva420p to yuv420p the resize loop would try to
> access an output plane that did not exist.
> Added a check for the output planes existence.
>
> Example cmd: ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i
> example.mp4 -vf scale_npp=format=yuva420p,scale_npp=format=yuv420p -c:v
> h264_nvenc -f null -
>
> Signed-off-by: Jorge Estrada <jestrada.list@gmail.com>
> ---
>  libavfilter/vf_scale_npp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavfilter/vf_scale_npp.c b/libavfilter/vf_scale_npp.c
> index 1b1b7b9fc9..5387bf9c7a 100644
> --- a/libavfilter/vf_scale_npp.c
> +++ b/libavfilter/vf_scale_npp.c
> @@ -721,7 +721,7 @@ static int nppscale_resize(AVFilterContext *ctx,
> NPPScaleStageContext *stage,
>      NppStatus err;
>      int i;
>
> -    for (i = 0; i < FF_ARRAY_ELEMS(stage->planes_in) && i <
> FF_ARRAY_ELEMS(in->data) && in->data[i]; i++) {
> +    for (i = 0; i < FF_ARRAY_ELEMS(stage->planes_in) && i <
> FF_ARRAY_ELEMS(in->data) && in->data[i] && out->data[i]; i++) {
>          int iw = stage->planes_in[i].width;
>          int ih = stage->planes_in[i].height;
>          int ow = stage->planes_out[i].width;
> --
> 2.34.1
>
>
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