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avfilter/avf_avectorscope: make frame writable before writing to it
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@ -275,6 +275,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
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}
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s->outpicref->pts = insamples->pts;
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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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if (zoom < 1) {
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