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avfilter/avf_showspectrum: avoid overwritting text
Signed-off-by: Paul B Mahol <onemda@gmail.com>
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@ -1190,7 +1190,7 @@ static int showspectrumpic_request_frame(AVFilterLink *outlink)
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for (x = 0; x < w; x+=80) {
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dst[x] = 200;
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}
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for (x = 0; x < w; x += 80) {
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for (x = 0; x < w - 79; x += 80) {
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float hertz = x * (inlink->sample_rate / 2) / (float)(1 << (int)ceil(log2(w)));
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char *units;
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