avfilter/vf_decimate: fix typo in fraction

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/vf_decimate.c

@@ -217,7 +217,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
                 av_frame_free(&frame);
                 frame = dm->clean_src[i];
             }
-            frame->pts = av_rescale_q(outlink->frame_count, dm->ts_unit, (AVRational){1,0}) +
+            frame->pts = av_rescale_q(outlink->frame_count, dm->ts_unit, (AVRational){1,1}) +
                          (dm->start_pts == AV_NOPTS_VALUE ? 0 : dm->start_pts);
             ret = ff_filter_frame(outlink, frame);
             if (ret < 0)