Clean the audio twice for a cleaner output.

devinyl.ps1

@@ -1,5 +1,4 @@
 # Based on this guide: http://www.zoharbabin.com/how-to-do-noise-reduction-using-ffmpeg-and-sox/
-# Script converted to PowerShell
 
 # Check that FFMPEG and sox are installed
 if (-not (Get-Command ffmpeg -ErrorAction SilentlyContinue)) {
@@ -28,19 +27,33 @@ $DECOMPRESSED = $OUTPUTFILE + '.wav'
 Write-Host "Decompressing the audio file..."
 ffmpeg -i $INPUTFILE $DECOMPRESSED
 
-# Listen to first half second of video
-Write-Host "Listening to first half second of video to get noise level..."
-ffmpeg -i $DECOMPRESSED -ss 00:00:00.0 -t 00:00:00.5 noiseaud.wav
+# Listen to first half second of audio
+Write-Host "Listening to first half second of audio to get noise level..."
+ffmpeg -i $DECOMPRESSED -ss 00:00:01.0 -t 00:00:02.0 noiseaudpre.wav
 
 # Generate noise profile
 Write-Host "Making noise profile..."
-sox noiseaud.wav -n noiseprof noise.prof
+sox noiseaudpre.wav -n noiseprof noisepre.prof
 
 # Clean the audio file with the profile created
 Write-Host "Cleaning the audio with the profile..."
-sox $DECOMPRESSED $OUTPUTFILE-clean.wav noisered noise.prof 0.21
+sox $DECOMPRESSED $OUTPUTFILE-preclean.wav noisered noisepre.prof 0.21
+
+# Listen to first half second of audio
+Write-Host "Listening to first half second of audio to get noise level..."
+ffmpeg -i $OUTPUTFILE-preclean.wav -ss 00:00:01.0 -t 00:00:02.0 noiseaud.wav
+
+# Generate second noise profile
+Write-Host "Making second noise profile..."
+sox noiseaud.wav -n noiseprof noise.prof
+
+# Clean the audio file with the second profile
+Write-Host "Cleaning the audio with the second profile..."
+sox $OUTPUTFILE-preclean.wav $OUTPUTFILE-clean.wav noisered noise.prof 0.21
+
+# Convert the cleaned audio to FLAC
 ffmpeg -i $OUTPUTFILE-clean.wav $OUTPUTFILE-clean.flac
 
 Write-Host "Cleaning up..."
 # Clean up temp files
-Remove-Item noiseaud.wav, noise.prof, $OUTPUTFILE-clean.wav, $DECOMPRESSED
+Remove-Item noiseaudpre.wav, noiseaud.wav, noisepre.prof, noise.prof, $OUTPUTFILE-preclean.wav, $OUTPUTFILE-clean.wav, $DECOMPRESSED

devinyl.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 
-# Check if ffmpeg and sox are installed
+# Based on this guide: http://www.zoharbabin.com/how-to-do-noise-reduction-using-ffmpeg-and-sox/
+
+# Check that FFMPEG and sox are installed
 if ! command -v ffmpeg &> /dev/null
 then
     echo "FFMPEG is not installed."
@@ -14,34 +16,47 @@ then
 fi
 
 # Check if a file has been passed for cleaning
-if [ $# -eq 0 ]
-then
+if [ "$#" -eq 0 ]; then
     echo "No file given to clean up."
     exit
 fi
 
 # Variables
-INPUTFILE=$1
+INPUTFILE="$1"
 OUTPUTFILE="${INPUTFILE%.*}"
-DECOMPRESSED="$OUTPUTFILE.wav"
+DECOMPRESSED="${OUTPUTFILE}.wav"
 
 # Decompress the audio file
 echo "Decompressing the audio file..."
-ffmpeg -i $INPUTFILE $DECOMPRESSED
+ffmpeg -i "$INPUTFILE" "$DECOMPRESSED"
 
-# Listen to first half second of video
-echo "Listening to first half second of video to get noise level..."
-ffmpeg -i $DECOMPRESSED -ss 00:00:00.0 -t 00:00:00.5 noiseaud.wav
+# Listen to first half second of audio
+echo "Listening to first half second of audio to get noise level..."
+ffmpeg -i "$DECOMPRESSED" -ss 00:00:01.0 -t 00:00:02.0 noiseaudpre.wav
 
 # Generate noise profile
 echo "Making noise profile..."
-sox noiseaud.wav -n noiseprof noise.prof
+sox noiseaudpre.wav -n noiseprof noisepre.prof
 
 # Clean the audio file with the profile created
 echo "Cleaning the audio with the profile..."
-sox $DECOMPRESSED $OUTPUTFILE-clean.wav noisered noise.prof 0.21
-ffmpeg -i $OUTPUTFILE-clean.wav $OUTPUTFILE-clean.flac
+sox "$DECOMPRESSED" "${OUTPUTFILE}-preclean.wav" noisered noisepre.prof 0.21
+
+# Listen to first half second of audio
+echo "Listening to first half second of audio to get noise level..."
+ffmpeg -i "${OUTPUTFILE}-preclean.wav" -ss 00:00:01.0 -t 00:00:02.0 noiseaud.wav
+
+# Generate second noise profile
+echo "Making second noise profile..."
+sox noiseaud.wav -n noiseprof noise.prof
+
+# Clean the audio file with the second profile
+echo "Cleaning the audio with the second profile..."
+sox "${OUTPUTFILE}-preclean.wav" "${OUTPUTFILE}-clean.wav" noisered noise.prof 0.21
+
+# Convert the cleaned audio to FLAC
+ffmpeg -i "${OUTPUTFILE}-clean.wav" "${OUTPUTFILE}-clean.flac"
 
 echo "Cleaning up..."
 # Clean up temp files
-rm noiseaud.wav noise.prof $OUTPUTFILE-clean.wav $DECOMPRESSED
+rm noiseaudpre.wav noiseaud.wav noisepre.prof noise.prof "${OUTPUTFILE}-preclean.wav" "${OUTPUTFILE}-clean.wav" "$DECOMPRESSED"