lgtm
On Tue, Dec 8, 2020 at 2:29 PM Gyan Doshi <ffm...@gyani.pro> wrote:
> The cropdetect filter, at present, skips the first two frames. This
> behaviour is hardcoded.
>
> New option 'skip' allows users to change this. Convenient for when
> input is a single image or a trimmed video stream.
>
> Default is kept at 2 to preserve current behaviour.
> ---
> doc/filters.texi | 4 ++++
> libavfilter/vf_cropdetect.c | 10 ++++++----
> 2 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 62d6e26a02..d9f606604e 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -8899,6 +8899,10 @@ The value which the width/height should be
> divisible by. It defaults to
> get only even dimensions (needed for 4:2:2 video). 16 is best when
> encoding to most video codecs.
>
> +@item skip
> +Set the number of initial frames for which evaluation is skipped.
> +Default is 2. Range is 0 to INT_MAX.
> +
> @item reset_count, reset
> Set the counter that determines after how many frames cropdetect will
> reset the previously detected largest video area and start over to
> diff --git a/libavfilter/vf_cropdetect.c b/libavfilter/vf_cropdetect.c
> index 7c7d0b953a..5ae87cad2d 100644
> --- a/libavfilter/vf_cropdetect.c
> +++ b/libavfilter/vf_cropdetect.c
> @@ -37,6 +37,7 @@ typedef struct CropDetectContext {
> int x1, y1, x2, y2;
> float limit;
> int round;
> + int skip;
> int reset_count;
> int frame_nb;
> int max_pixsteps[4];
> @@ -127,10 +128,10 @@ static av_cold int init(AVFilterContext *ctx)
> {
> CropDetectContext *s = ctx->priv;
>
> - s->frame_nb = -2;
> + s->frame_nb = -1 * s->skip;
>
> - av_log(ctx, AV_LOG_VERBOSE, "limit:%f round:%d reset_count:%d\n",
> - s->limit, s->round, s->reset_count);
> + av_log(ctx, AV_LOG_VERBOSE, "limit:%f round:%d skip:%d
> reset_count:%d\n",
> + s->limit, s->round, s->skip, s->reset_count);
>
> return 0;
> }
> @@ -167,7 +168,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame
> *frame)
> int outliers, last_y;
> int limit = lrint(s->limit);
>
> - // ignore first 2 frames - they may be empty
> + // ignore first s->skip frames
> if (++s->frame_nb > 0) {
> metadata = &frame->metadata;
>
> @@ -247,6 +248,7 @@ static const AVOption cropdetect_options[] = {
> { "limit", "Threshold below which the pixel is considered black",
> OFFSET(limit), AV_OPT_TYPE_FLOAT, { .dbl = 24.0/255 }, 0, 65535,
> FLAGS },
> { "round", "Value by which the width/height should be divisible",
> OFFSET(round), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, FLAGS },
> { "reset", "Recalculate the crop area after this many frames",
> OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
> + { "skip", "Number of initial frames to skip",
> OFFSET(skip), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, FLAGS },
> { "reset_count", "Recalculate the crop area after this many
> frames",OFFSET(reset_count),AV_OPT_TYPE_INT,{ .i64 = 0 }, 0, INT_MAX,
> FLAGS },
> { "max_outliers", "Threshold count of outliers",
> OFFSET(max_outliers),AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
> { NULL }
> --
> 2.27.0
>
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