vf_interlace: implement frame rate

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from ffmpeg commit 227b4458fb434875b127a0c2306fa3b899a770bf)
Signed-off-by: Anton Khirnov <anton@khirnov.net>

diff --git a/libavfilter/vf_interlace.c b/libavfilter/vf_interlace.c
index 8ef58e4e89d45d905606480f322c8c2a3e97a497..939fabc8435cd96420dedfa8af3dbabcafddd0b1 100644 (file)
--- a/libavfilter/vf_interlace.c
+++ b/libavfilter/vf_interlace.c
@@ -109,8 +109,10 @@ static int config_out_props(AVFilterLink *outlink)
     outlink->w = inlink->w;
     outlink->h = inlink->h;
     outlink->time_base = inlink->time_base;
+    outlink->frame_rate = inlink->frame_rate;
     // half framerate
     outlink->time_base.num *= 2;
+    outlink->frame_rate.den *= 2;
 
 
     if (s->lowpass) {