[FFmpeg-devel] [PATCH] dynaudnorm: Increment input outside of the FFMIN macro so it doesn't get double incremented.

andyndeanna andyndeanna at gmail.com
Wed Aug 9 04:36:50 EEST 2017


Please find attached a patch for the dynaudnorm filter.  Under certain
conditions, the output to the filter will clip at the beginning.  This can
be demonstrated with the following:

ffmpeg -filter_complex "aevalsrc=0:s=48000:d=0.6
[a_in1];[a_in0] [a_in1] concat=n=2:v=0:a=1 [a_in];[a_in]
dynaudnorm=b=1:m=100.0 [a_out]" -map "[a_out]" test.wav

The root cause is that the FFMIN macro evaluates the minimum argument
twice, resulting in the variable "input" getting incremented twice.

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