In addition to the normal gain, R128Gain may compute the "True Peak" value as defined by EBU R128, which is a somewhat more expensive process and can slow down the computations a lot.
It may also not have a optimized FFT filter for the K-Weighting, a naive C implementation would be relatively slow.
Although, without knowing the length of said MP3, its certainly super slow to take 2 minutes for something like a 5 minute audio file.
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LAV Filters - open source ffmpeg based media splitter and decoders
Last edited by nevcairiel; 3rd December 2014 at 00:12.
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