I do suggest at least trying out Audacity with a few files. Audacity is really great at fixing audio, where just a generic filter will not fix issues such as deafening wind noise which may or may have not completely ruined the audio. I also agree with with using Audacity for fixing the current files you currently have. I hope that this approach helps give you the DSP experience you're looking for, while also solving the noise reduction problem you have with your current video.Fix the audio in Audacity then import the “clean” audio into Shotcut. This is as simple as a one line command: ffmpeg -i your-video-file.mp4 -i your-audio-file.aac -c:v copy -c:a copy output.mp4 Patching Together Reworked Audio with Original VideoĪgain, ``ffmpeg` is your friend here. If you don't know how to compute & view the FFT of a signal in Python, consult the Examples section of the numpy documentation on the function. In the end, you're left with whatever additional energy is present in the signal, which is usually the part of the interesting part of the audio. So, there's no one, static solution for all audio files that I could show you - just analyze the magnitudes of your audio's FFT frame-by-frame and figure out what works best for your audio. Coming up with what filter, what frame size, and what energy level works best for your case is part of what makes each spectral subtraction technique different. All it takes is to compute the FFT of the audio signal in question, split the FFT into smaller "frames", identify the power level of the steady background noise within each frame, and then filter out that energy from the entire frame. Spectral subtraction is so widely used because. Removing Wind Noise By Analyzing FFT Dataīuilt-in tools for audio noise reduction / removal, like the Noise Removal Tool in Audacity, are all various implementation of the same concept: spectral subtraction. Remember to change the file extensions depending on what video file extension you're working with.Įxtract the audio from the terminal through Python: import subprocess as subprocĬommand = "ffmpeg -i C:/path/to/file/your-video-file.mp4 -vn -acodec copy C:/path/to/your-audio-file.aac" You have two choices.Įxtract the audio straight from the terminal: $ ffmpeg -i C:/path/to/file/your-video-file.mp4 -vn -acodec copy your-audio-file.aac It's more of a tutorial / user's guide and less overwhelming than the documentation I linked above. You can do this with ffmpeg and a pointed explanation of how to do exactly this, following this link. I've linked you the documentation available for the whole toolkit, just so you can glance around and get a feel for what sort of wonders can be performed with it.īut, all you need to do is extract audio from your video file. There is a simple cross-platform tool for manipulating / accessing video & audio files called ffmpeg.
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