FFMPEG change Tone Frequency (Pitch Audio)

audio ffmpeg pitch
dazzafact picture dazzafact · Nov 19, 2018 · Viewed 8k times · Source

How can I change the Tone frequency. This Example only pitches it by keeping the old tone frequency and only decrease the length of File.

For Example, I have a constant 100 Herz tone (as mp3) and I want it to change 90 Herz

 ffmpeg -i 100h.mp3 -af atempo=100/90 90h.mp3

This Example doesn't work for me, it sounds the same

inputfile Mp3
outputfile Mp3

Answer

dazzafact picture dazzafact · Nov 19, 2018

finally this works by keeping also the audio length

 ffmpeg -i test.mp3 -af asetrate=44100*0.9, aresample=44100, atempo=1/0.9 output.mp3

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