[FFmpeg-devel] [PATCH] lavfi/minterpolate: fix blending calc issue.

[mypopy at gmail.com]

On Wed, Jun 27, 2018 at 5:52 PM Jun Zhao <mypopydev at gmail.com> wrote:
>
> the right blending calc is:
> (alpha * Frame_2 + (MAX - alpha) * Frame_1 + 512) >> 10
>
> Signed-off-by: Jun Zhao <mypopydev at gmail.com>
> ---
>  libavfilter/vf_minterpolate.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c
> index d534315..c6a5e63 100644
> --- a/libavfilter/vf_minterpolate.c
> +++ b/libavfilter/vf_minterpolate.c
> @@ -1122,8 +1122,8 @@ static void interpolate(AVFilterLink *inlink,
AVFrame *avf_out)
>                  for (y = 0; y < height; y++) {
>                      for (x = 0; x < width; x++) {
>                          avf_out->data[plane][x + y * avf_out->linesize[plane]]
=
> -                                          alpha  * mi_ctx->frames[2].avf->data[plane][x
+ y * mi_ctx->frames[2].avf->linesize[plane]] +
> -                            ((ALPHA_MAX - alpha) * mi_ctx->frames[1].avf->data[plane][x
+ y * mi_ctx->frames[1].avf->linesize[plane]] + 512) >> 10;
> +                            (alpha  * mi_ctx->frames[2].avf->data[plane][x
+ y * mi_ctx->frames[2].avf->linesize[plane]] +
> +                             (ALPHA_MAX - alpha) * mi_ctx->frames[1].avf->data[plane][x
+ y * mi_ctx->frames[1].avf->linesize[plane]] + 512) >> 10;
>                      }
>                  }
>              }
> --
> 2.7.4
>
ping, any comments for this fix?