Re: [FFmpeg-devel] [PATCH] avcodec/nvenc: Fix segfault with intra-only

[Josh Allmann <joshua.allmann@gmail.com>]

On Thu, 20 Jun 2024 at 17:39, Josh Allmann <joshua.allmann@gmail.com> wrote:
>
> In intra-only mode, frameIntervalP is 0, which means the frame
> data array is smaller than the number of surfaces. This causes a
> crash when closing the encoder.
>
> Fix this by making sure the frame data array is at least as big as
> the number of surfaces.
> ---
>  libavcodec/nvenc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
> index a9945355ba..93e87b21db 100644
> --- a/libavcodec/nvenc.c
> +++ b/libavcodec/nvenc.c
> @@ -1021,7 +1021,7 @@ static av_cold int nvenc_recalc_surfaces(AVCodecContext *avctx)
>
>      // Output in the worst case will only start when the surface buffer is completely full.
>      // Hence we need to keep at least the max amount of surfaces plus the max reorder delay around.
> -    ctx->frame_data_array_nb = ctx->nb_surfaces + ctx->encode_config.frameIntervalP - 1;
> +    ctx->frame_data_array_nb = FFMAX(ctx->nb_surfaces, ctx->nb_surfaces + ctx->encode_config.frameIntervalP - 1);
>
>      return 0;
>  }
> --
> 2.39.2
>

Hello,

Ping for review. This patch fixes an easily triggered crash with nvenc
in intra-only mode, eg

ffmpeg -i <in> -c:v h264_nvenc -g 0 <out>

Josh
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