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davinci-resolve-linux
Setup Davinci Resolve on Linux an Fix Issues with Importing and Exporting Media
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I'm a huge fan of DaVinci Resolve for video editing. It is just as powerful as Premiere, has a workflow and user interface that feels intuitive, and, importantly, it's FREE. Their audio editor has its own section called Fairlight within the app, and when you load your mkv recording into Resolve, you should see your selected audio tracks separated out and in graphical wave form. From there, you can zone in on the specific areas of the track with the offending noise pollution and selectively gate it out by adjusting your levels/ applying VST's.
OBS is free, it's hella functional right out of the box and it's open source, so there are TONS of plugins and add-ons that you can download to customize it into the perfect app for your use case.