Audio to Video Conversion for YouTube

convert-all-music-to-video.sh

#!/bin/bash

# Define the folder containing the tracks
# Defaults to the "Tracks" folder
TRACKS_FOLDER="${1:-Tracks}"

# Iterate through each file in the folder
for file in "$TRACKS_FOLDER"/*
do
  # Check if it's a file (not a directory) and (hopefully) a media file
  if [ -f "$file" ] &&
     [[ "${file##*.}" != "mp4" ]] &&
     [[ "${file##*.}" != "ini" ]] &&
     [[ "${file##*.}" != "DS_Store" ]]; then
    # Call the script with the current file
    bash music-to-video.sh "$file"
  fi
done

music-to-video.sh

#!/bin/bash

# Extract title and subtitle from filename
extract_title_subtitle() {
    local filename="$1"
    
    # Extract title (text before the first dash)
    local title=$(echo "$filename" | awk -F ' - ' '{print $1}')
    
    # Extract subtitle (text between the first and second dash, if they exist)
    local subtitle=$(echo "$filename" | awk -F ' - ' '{if (NF >= 3) print $2}')
    
    # Trim whitespace
    title=$(echo "$title" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')
    subtitle=$(echo "$subtitle" | sed 's/^[[:space:]]*//;s/[[:space:]]*$//')

    echo -n "$title" > title.txt
    echo -n "$subtitle" > subtitle.txt
}

# Check if the correct number of arguments is provided
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <music_file_path>"
    exit 1
fi

# Assign command line arguments to variables
MUSIC_FILE="$1"
COVER_IMAGE="cover.png"
OUTPUT_FILE="${MUSIC_FILE%.*}.mp4"

# Target image width and height, in pixels
ART_RES=2160

# Get title and subtitle information
$(extract_title_subtitle "$(basename "$MUSIC_FILE" .flac)")

# Get the duration of the audio file using ffprobe
DURATION=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$MUSIC_FILE")

# Check if the duration was successfully retrieved
if [ -z "$DURATION" ]; then
    echo "Error: Unable to retrieve audio duration from $MUSIC_FILE"
    exit 1
fi

# Calculate the fade-out start time (3 seconds before the end)
FADE_OUT_START=$(echo "$DURATION - 3" | bc)

# Create a temporary image file with the desired text overlay
# Assumes the desired font, Comic Sans, is in the current directory as COMIC.TTF
# Font size and poisition will depend on the cover size; here it is 4096x4096
TEMP_IMAGE="temp_image.png"
echo \"$TITLE\"
echo \"$SUBTITLE\"
ffmpeg -i "$COVER_IMAGE" \
-vf "drawtext=textfile=title.txt:fontfile=COMIC.TTF:fontsize=240:fontcolor=white:x=320:y=150:box=1:boxcolor=black@0.5:boxborderw=20:line_spacing=-20,
drawtext=textfile=subtitle.txt:fontfile=COMIC.TTF:fontsize=120:fontcolor=white:x=320:y=500:box=1:boxcolor=black@0.5:boxborderw=10:line_spacing=-10" \
"$TEMP_IMAGE"

# Run the ffmpeg command to generate the video
# Apply a 3-second fade on either side
# Preserve the original FLAC audio; nonstandard but preserves quality
ffmpeg -loop 1 -i "$TEMP_IMAGE" -i "$MUSIC_FILE" \
    -vf "fade=t=in:st=0:d=3,fade=t=out:st=$FADE_OUT_START:d=3,scale=$ART_RES:$ART_RES" \
    -c:v libx264 -tune stillimage -pix_fmt yuv420p -r 60 \
    -c:a flac -strict -2 \
    -shortest "$OUTPUT_FILE"

# Remove temporary data
rm "$TEMP_IMAGE" title.txt subtitle.txt

# Check if the command succeeded
if [ $? -eq 0 ]; then
    echo "Video created successfully: $OUTPUT_FILE"
else
    echo "Error creating video."
    exit 1
fi