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Disabling weak transients and 5ms resolution on voiced frames

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1687,7 +1687,7 @@

       /* Reduces the likelihood of energy instability on fricatives at low bitrate

          in hybrid mode. It seems like we still want to have real transients on vowels

          though (small SILK quantization offset value). */

-      int allow_weak_transients = hybrid && effectiveBytes<15 && st->silk_info.offset >= 100;

+      int allow_weak_transients = hybrid && effectiveBytes<15 && st->silk_info.signalType != 2;

       isTransient = transient_analysis(in, N+overlap, CC,

             &tf_estimate, &tf_chan, allow_weak_transients, &weak_transient);

    }

@@ -1886,7 +1886,7 @@

       for (i=0;i<end;i++)

          tf_res[i] = 1;

       tf_select=0;

-   } else if (hybrid && effectiveBytes<15)

+   } else if (hybrid && effectiveBytes<15 && st->silk_info.signalType != 2)

    {

       /* For low bitrate hybrid, we force temporal resolution to 5 ms rather than 2.5 ms. */

       for (i=0;i<end;i++)