On Tue, Dec 04, 2018 at 11:56:18AM +0800, 林至善 wrote: > Hi all, > > I am trying to compare the wav file with/without dithering, but it seems > that my command doesn't work. Here's my command line and console output: > > [1] *ffmpeg -i Fsweep96.wav -af > aresample=8000:dither_scale=0:dither_method=0 Fsweep8_NoDither.wav* (I > would assume this would generate a file *without *dither, > Fsweep8_NoDither.wav) > [image: 1.JPG] > > [2]* ffmpeg -i Fsweep96.wav -af > aresample=8000:dither_scale=1:dither_method=rectangular Fsweep8_Dither.wav *(I > would assume this would generate a file *with *dither, Fsweep8_Dither.wav) > [image: 2.JPG] > > But the output file Fsweep8_NoDither.wav/Fsweep8_Dither.wav are totally the > same, both the wav header and the PCM value(it should be > increased/decreased by a small value like +-1 in Fsweep8_Dither.wav). > > The question is : > *It seems that my command doesn't work. Is that correct? If I want to > enable/disable dithering, what command should I use?
try choosing a more precisse internal sample format, for example: "-internal_sample_fmt fltp" [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB it is not once nor twice but times without number that the same ideas make their appearance in the world. -- Aristotle
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