[FFmpeg-devel] [PATCH 2/2] avfilter/vf_scale2ref: switch to FFFrameSync

[Niklas Haas]

On Wed, 13 Mar 2024 13:24:25 +0100 Niklas Haas <ffmpeg at haasn.xyz> wrote:
> -    frame_changed = in->width  != link->w ||
> -                    in->height != link->h ||
> -                    in->format != link->format ||
> -                    in->sample_aspect_ratio.den != link->sample_aspect_ratio.den ||
> -                    in->sample_aspect_ratio.num != link->sample_aspect_ratio.num ||
> -                    in->colorspace != link->colorspace ||
> -                    in->color_range != link->color_range;
> +    ret = ff_framesync_dualinput_get(fs, &main, &ref);
> +    if (ret < 0)
> +        return ret;
>  
> -    if (frame_changed) {
> -        link->format = in->format;
> -        link->w = in->width;
> -        link->h = in->height;
> -        link->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
> -        link->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
> -        link->colorspace = in->colorspace;
> -        link->color_range = in->color_range;
> +    if (ref) {
> +        reflink->format = ref->format;
> +        reflink->w = ref->width;
> +        reflink->h = ref->height;
> +        reflink->sample_aspect_ratio.num = ref->sample_aspect_ratio.num;
> +        reflink->sample_aspect_ratio.den = ref->sample_aspect_ratio.den;
> +        reflink->colorspace = ref->colorspace;
> +        reflink->color_range = ref->color_range;
>  
> -        config_props_ref(outlink);
> -    }
> +        ret = config_props(outlink);
> +        if (ret < 0)
> +            return ret;

This change unintentionally dropped the `frame_changed` check to avoid
reconfiguring the sws context unnecessarily. Fixed locally by
reintroducing the check.