Paul B Mahol (2017-11-29):
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> doc/filters.texi | 4 ++++
> libavfilter/vf_tile.c | 12 +++++++++++-
> 2 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 4a4efc70c8..4eb302448b 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -14637,6 +14637,10 @@ is "black".
> @item overlap
> Set the number of frames to overlap when tiling several successive frames
> together.
> The value must be between @code{0} and @var{nb_frames - 1}.
> +
> +@item init_padding
> +Set the number of input frames to initially pad before displaying first
> output frame.
Even knowing what it is supposed to mean I cannot parse this sentence.
> +The value must be between @code{0} and @var{nb_frames - 1}.
> @end table
>
> @subsection Examples
> diff --git a/libavfilter/vf_tile.c b/libavfilter/vf_tile.c
> index 7717ce12e7..c347939cce 100644
> --- a/libavfilter/vf_tile.c
> +++ b/libavfilter/vf_tile.c
> @@ -38,6 +38,7 @@ typedef struct TileContext {
> unsigned margin;
> unsigned padding;
> unsigned overlap;
> + unsigned init_padding;
> unsigned current;
> unsigned nb_frames;
> FFDrawContext draw;
> @@ -62,6 +63,8 @@ static const AVOption tile_options[] = {
> { "color", "set the color of the unused area", OFFSET(rgba_color),
> AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
> { "overlap", "set how many frames to overlap for each render",
> OFFSET(overlap),
> AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
> + { "init_padding", " set how many frames to initially pad",
> OFFSET(init_padding),
> + AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
> { NULL }
> };
>
> @@ -99,6 +102,12 @@ static av_cold int init(AVFilterContext *ctx)
> tile->overlap = tile->nb_frames - 1;
> }
>
> + if (tile->init_padding >= tile->nb_frames) {
> + av_log(ctx, AV_LOG_WARNING, "init_padding must be less than %d\n",
> tile->nb_frames);
> + } else {
> + tile->current = tile->init_padding;
> + }
> +
> return 0;
> }
>
> @@ -201,7 +210,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame
> *picref)
> tile->out_ref->height = outlink->h;
>
> /* fill surface once for margin/padding */
> - if (tile->margin || tile->padding)
> + if (tile->margin || tile->padding ||
> + (tile->init_padding != 0 && !tile->prev_out_ref))
Incorrect, prev_out_ref is only set if overlap is non-zero.
> ff_fill_rectangle(&tile->draw, &tile->blank,
> tile->out_ref->data,
> tile->out_ref->linesize,
Regards,
--
Nicolas George
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