lavfi/avf_avectorscope: set frame durations
The filter is supposed to produce CFR output.
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				@ -275,6 +275,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
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            memset(s->outpicref->data[0] + i * s->outpicref->linesize[0], 0, outlink->w * 4);
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					            memset(s->outpicref->data[0] + i * s->outpicref->linesize[0], 0, outlink->w * 4);
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    }
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					    }
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    s->outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);
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					    s->outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);
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					    s->outpicref->duration = 1;
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    av_frame_make_writable(s->outpicref);
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					    av_frame_make_writable(s->outpicref);
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    ff_filter_execute(ctx, fade, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
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					    ff_filter_execute(ctx, fade, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
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