[FFmpeg-devel] [PATCH 2/4] avfilter/vf_zscale: fix number of threads

[Marton Balint]

Make sure it is between [1, MAX_THERADS] and also take into account the outlink
size in order not to request zero height output from zscale.

Signed-off-by: Marton Balint <cus at passwd.hu>
---
 libavfilter/vf_zscale.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_zscale.c b/libavfilter/vf_zscale.c
index bb457423b3..bab87b0c94 100644
--- a/libavfilter/vf_zscale.c
+++ b/libavfilter/vf_zscale.c
@@ -799,7 +799,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
         link->dst->inputs[0]->w      = in->width;
         link->dst->inputs[0]->h      = in->height;
 
-        s->nb_threads = FFMIN(ff_filter_get_nb_threads(ctx), link->h / 8);
+        s->nb_threads = av_clip(FFMIN(ff_filter_get_nb_threads(ctx), FFMIN(link->h, outlink->h) / 8), 1, MAX_THREADS);
         s->in_colorspace = in->colorspace;
         s->in_trc = in->color_trc;
         s->in_primaries = in->color_primaries;
-- 
2.31.1