Add scripts for audio transcription using whisper.cpp

bin/extract-16bit-wav-from-video

@@ -0,0 +1,50 @@
+#!/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
+
+input="$1"
+output_name="$2"
+
+if [[ $input == "" || $output_name == "" ]]; then
+    printf "${BOLD}${RED}Usage: $0 <input video> <wav output name>${NORMAL}\n"
+    exit 1
+fi
+
+if [[ ! -f "$input" ]]; then
+    printf "${RED}${BOLD}Error: failed to extract audio. Video file \"$input\" doesn't exist.\n${NORMAL}"
+    exit 1
+fi
+
+# Add extension if not provided.
+output_basename=$(basename -- "$output_name")
+output_extension="${output_basename##*.}"
+if [[ $output_extension != "wav" ]]; then
+    output_name="${output_name}.wav"
+fi
+
+printf "\n${YELLOW}${BOLD}Extracting 16-bit WAV from $input | output: $output_name${NORMAL}\n"
+
+ffmpeg -i "$input" -ar 16000 -ac 1 -c:a pcm_s16le "$output_name"
+
+printf "${GREEN}${BOLD}Done extracting 16-bit WAV from $input | output: $output_name${NORMAL}\n"