shithub: sox

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report only for 1st channel

--- a/src/spectrogram.c

+++ b/src/spectrogram.c

@@ -235,7 +235,7 @@

   p->block_steps = floor((double)p->block_steps / p->step_size +.5);

   p->block_norm = 1. / p->block_steps;

   actual = effp->in_signal.rate / p->step_size / p->block_steps;

-  if (actual != pixels_per_sec)

+  if (!effp->flow && actual != pixels_per_sec)

     lsx_report("actual pixels/s = %g", actual);

   lsx_debug("step_size=%i block_steps=%i", p->step_size, p->block_steps);

   p->max = -p->dB_range;