Add a script to extract audio from a video

bin/extract-audio-from-video

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+if which tput >/dev/null 2>&1; then
+    ncolors=$(tput colors)
+fi
+if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
+    RED="$(tput setaf 1)"
+    GREEN="$(tput setaf 2)"
+    YELLOW="$(tput setaf 3)"
+    BLUE="$(tput setaf 4)"
+    MAGENTA="$(tput setaf 5)"
+    CYAN="$(tput setaf 6)"
+    BOLD="$(tput bold)"
+    NORMAL="$(tput sgr0)"
+else
+    RED=""
+    GREEN=""
+    YELLOW=""
+    BLUE=""
+    MAGENTA=""
+    CYAN=""
+    BOLD=""
+    NORMAL=""
+fi
+
+transcode="$1"
+filename=$(basename -- "$2")
+format="$3"
+bitrate="$4"
+
+if [[ $1 == "" || $2 == "" || $3 == "" ]]; then
+    printf "${BOLD}${RED}Usage: $0 <transcode? 0|1 (needed when container doesn't contain format)> <filename> <format (mp3, m4a, aac, etc)> <optional: bitrate. Uses 64k when not specified, 0 = variable (e.g. 0, 64, 128, etc)>${NORMAL}\n"
+    exit 1
+fi
+
+extension="${filename##*.}"
+filename="${filename%.*}"
+output_name="$filename.$format"
+
+if [[ $bitrate == "" ]]; then
+    bitrate="64"
+fi
+
+printf "\n${YELLOW}${BOLD}Extracting audio from '$filename.$extension' | bitrate: ${bitrate}k | output: $output_name${NORMAL}\n"
+
+if [[ $transcode == "1" ]]; then
+    # Transcode audio
+    ffmpeg -i "$filename.$extension" -b:a ${bitrate}k -ac 2 -ar 44100 -map a "$output_name"
+else
+    # Grab the audio stream from the video.
+    ffmpeg -i "$filename.$extension" -vn -acodec copy "$output_name"
+fi
+
+printf "\n${GREEN}${BOLD}Done extracting audio from '$filename.$extension' | output name '$output_name'${NORMAL}\n\n"
+