Add a noise reduction script (using sox and ffmpeg) (#850)

* Create noisereduce

* Update noisereduce

* Update noisereduce

.local/bin/noisereduce

@@ -0,0 +1,81 @@
+#!/usr/bin/sh
+
+usage ()
+{
+    printf "Usage : noisereduce <input video file> <output video file>\n"
+    exit
+}
+
+# Tests for requirements
+ffmpeg -version >/dev/null || { echo >&2 "We require 'ffmpeg' but it's not installed. Install it by 'sudo apt-get install ffmpeg' Aborting."; exit 1; }
+sox --version >/dev/null || { echo >&2 "We require 'sox' but it's not installed. Install it by 'sudo apt-get install sox' Aborting."; exit 1; }
+
+if [ "$#" -ne 2 ]
+then
+  usage
+fi
+
+if [ ! -e "$1" ]
+then
+    printf "File not found: %s\n" "$1"
+    exit
+fi
+
+if [ -e "$2" ]
+then
+    printf "File %s already exists, overwrite? [y/N]\n: " "$2"
+    read -r yn
+    case $yn in
+        [Yy]* ) ;;
+        * ) exit;;
+    esac
+fi
+
+inBasename=$(basename "$1")
+inExt="${inBasename##*.}"
+
+isVideoStr=$(ffprobe -v warning -show_streams "$1" | grep codec_type=video)
+if [ -n "$isVideoStr" ]
+then
+    isVideo=1
+    printf "Detected %s as a video file\n" "$inBasename"
+else
+    isVideo=0
+    printf "Detected %s as an audio file\n" "$inBasename"
+fi
+
+printf "Sample noise start time [00:00:00]: "
+read -r sampleStart
+if [ -z "$sampleStart" ] ; then sampleStart="00:00:00"; fi
+printf "Sample noise end time [00:00:00.900]: "
+read -r sampleEnd
+if [ -z "$sampleEnd" ] ; then sampleEnd="00:00:00.900"; fi
+printf "Noise reduction amount [0.21]: " 
+read -r sensitivity
+if [ -z "$sensitivity" ] ; then sensitivity="0.21"; fi
+
+
+tmpVidFile="/tmp/noiseclean_tmpvid.$inExt"
+tmpAudFile="/tmp/noiseclean_tmpaud.wav"
+noiseAudFile="/tmp/noiseclean_noiseaud.wav"
+noiseProfFile="/tmp/noiseclean_noise.prof"
+tmpAudCleanFile="/tmp/noiseclean_tmpaud-clean.wav"
+
+printf "Cleaning noise on %s...\n" "$1"
+
+if [ $isVideo -eq "1" ]; then
+    ffmpeg -v warning -y -i "$1" -qscale:v 0 -vcodec copy -an "$tmpVidFile"
+    ffmpeg -v warning -y -i "$1" -qscale:a 0 "$tmpAudFile"
+else
+    cp "$1" "$tmpAudFile"
+fi
+ffmpeg -v warning -y -i "$1" -vn -ss "$sampleStart" -t "$sampleEnd" "$noiseAudFile"
+sox "$noiseAudFile" -n noiseprof "$noiseProfFile"
+sox "$tmpAudFile" "$tmpAudCleanFile" noisered "$noiseProfFile" "$sensitivity"
+if [ $isVideo -eq "1" ]; then
+    ffmpeg -v warning -y -i "$tmpAudCleanFile" -i "$tmpVidFile" -vcodec copy -qscale:v 0 -qscale:a 0 "$2"
+else
+    cp "$tmpAudCleanFile" "$2"
+fi
+
+printf "Done"