Audacity is the program that can remove noise. However, you need an audio file (not a video file) to work with. The Kino steps can be accomplished using ffmpeg, but they have been done using Kino here since that is how I perform basic clip editing.
Step 1: Extract audio (easy)
- This must be done on per-part to avoid extra complexities, so it should always be the first thing you do
- Open Kino project and export to a WAV using the Audio tab
Step 2: Filter noise (takes some patience)
- Open audio in Audacity
- Select a segment of white noise
- Go to Effect > Noise Removal, select "Get Noise Profile"
- Select entire track
- Go to Effect > Noise Removal, adjust the step 2 settings, and click "OK"
- Export to a new WAV file
Step 3: Add filtered audio back to video
- Open Kino project
- Select storyboard item that will get the new audio
- Go to FX tab
- Leave "Overwrite" tab active with the full time selected
- Use Audio Filter "Mix", select audio file
- Change graph in audio filter so line is at the top (maxed)
- Change "Audio Transition" to "No change"
- Click "Render"
That's it. The audio track for the video is now updated with reduced noise.