Reduce noise in the audio signal by profiling and filtering. Regarding the actual task of cleaning recordings, take a look at the filter noisered for which equals the noise reduction filter Audacity: So, it should be a nice fit as a companion command line alternative to audaciy!
Interactive, graphical audio editor, use audacity(1). Making quick, simple edits and to batch processing. SoX is a command-line audio processing tool, particularly suited to Quoting man sox: SoX - Sound eXchange, the Swiss Army knife of audio manipulation If the noise is similar you can use the same profile for all the mp3 files ls -r -1 *.mp3 | xargs -L1 -I_noise_reduced.mp3 noisered noise_profile_file 0.31 Try and play with that and if you find other setting tricks and please comment with the findings and tuning settings.
Values goes best somewhere between 0.20 and 0.30, over 0.3 is very aggressive, under 0.20 is kind of soft and works well for very noisy audios. Where noise_profile_file is the profile and 0.30 is the value. Now make a profile out of that source: sox noisesample.wav -n noiseprof noise_profile_fileĪnd finally run the noise reduction on the file: sox source.mp3 output.mp3 noisered noise_profile_file 0.31 Then before you run your command on the file/files first you need to build a profile, make a sample of noise, this is the most important part you have to select the best time when the noise takes place, make sure you don't have voice (or the music/signal you try to keep) in this sample: ffmpeg -i source.mp3 -ss 00:00:18 -t 00:00:20 noisesample.wav On Ubuntu with apt you should install sox and audio formats support soxįirst install sox and support for formats (including mp3): sudo apt install sox libsox-fmt-* The accepted answer doesn't give a practical example(see first comment to it) so I am trying to give one here.
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