Is it possible to convert a mp4 file to mp3 or flac, clearing background noises in the process?
Or is it possible to run audacity totally trough shell, No GUI?
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3Why kind of noise are we talking of? White noise or random people chatting in the background or bangs, scratch or cough noises in a classical music concert recording... How would you identify that noise with audacity?– Stéphane ChazelasCommented Feb 22, 2018 at 9:53
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Class room noises. A bit of chit chat, a bit of paper noises. And the truth is I don't know yet. It is a bit new to me.– matisaCommented Feb 22, 2018 at 9:56
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1Is it a stereo recording? Please add the extra information to you question by clicking the edit link– Stéphane ChazelasCommented Feb 22, 2018 at 10:15
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Some of the file will be stereo others not.– matisaCommented Feb 22, 2018 at 10:17
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1 Answer
If the background noise has some repetitive structure to it, you can remove it with the noiseprof and noisered effects of sox, see e.g. this script. Relevant bits repeated for convenience:
# Create background noise profile from mp3
/usr/bin/sox noise.mp3 -n noiseprof noise.prof
# Remove noise from mp3 using profile
/usr/bin/sox input.mp3 output.mp3 noisered noise.prof 0.21
Audacity currently has experimental scripting support.
