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lavfi/showwaves: do not set on outlink->out_buf the sent video frame
The video frame reference is passed along the filterchain, and is not possessed anymore by the filter. If out_buf is not set to NULL, it will be freed by ff_end_frame() causing a crash.
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@ -206,7 +206,6 @@ static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
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av_rescale_q((p - (int16_t *)insamples->data[0]) / nb_channels,
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(AVRational){ 1, inlink->sample_rate },
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outlink->time_base);
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outlink->out_buf = outpicref;
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linesize = outpicref->linesize[0];
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memset(outpicref->data[0], 0, showwaves->h*linesize);
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}
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