avfilter/avf_avectorscope: request new frames only when needed
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				@ -414,6 +414,11 @@ static int activate(AVFilterContext *ctx)
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    if (ret > 0)
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        return filter_frame(inlink, in);
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    if (ff_inlink_queued_samples(inlink) >= s->nb_samples) {
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        ff_filter_set_ready(ctx, 10);
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        return 0;
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    }
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    FF_FILTER_FORWARD_STATUS(inlink, outlink);
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    FF_FILTER_FORWARD_WANTED(outlink, inlink);
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