zsh/png2mp4.zsh

# png2mp4_x265()
# Converts a series of PNG images to an MP4 video using x265 encoding
#
# Usage: png2mp4_x265 [--max <number>] [--step <number>] [--repeat <number>]
#
# Options:
#   --max <number>    : Maximum number of images to process
#   --step <number>   : Multiplier for step count in overlay text (default: 1)
#   --repeat <number> : Number of times to repeat each image (default: 1)
#
# This function:
# 1. Deactivates conda environment
# 2. Finds all PNG files in the current directory
# 3. Uses the current directory name as the output filename prefix
# 4. Uses ffmpeg to create an MP4 with x265 encoding, including:
#    - Frame rate of 60 fps
#    - Image scaling to 1024x1024
#    - Step count overlay text (divided by 1,000,000 and truncated to remove 6 zeros and decimal places)
#    - High-quality encoding settings
# 5. Adds padding and fade-out effect to the final video
# 6. Reactivates conda environment
#
# Requirements:
#   - ffmpeg with libx265 support
#   - Inconsolata-Light.ttf font in /usr/share/fonts/TTF/
png2mp4_x265() {
    conda deactivate
    local step_multiplier=1
    local repeat=1
    local frame_rate=60
    local resolution="1024x1024"

    while [[ "$#" -gt 0 ]]; do
        case $1 in
            --step) step_multiplier="$2"; shift ;;
            --repeat) repeat="$2"; shift ;;
            *) echo "Unknown parameter passed: $1"; return 1 ;;
        esac
        shift
    done
    output_filename="$(basename "$(pwd)")_x265.mp4"
    echo "Output filename: $output_filename"

    local nframes=$(find . -type f -name '*.png' | wc -l)
    local duration=$(($nframes * $repeat / ${frame_rate}.))
    local fade_start=$((duration + 3))
    echo "Found $nframes for a duration of $duration seconds"

    echo "Running ffmpeg with x265 encoding..."
    local font=/usr/share/fonts/TTF/Inconsolata-Light.ttf
    local drawtext="drawtext=fontfile=${font}:text='Steps\: %{eif\\:trunc(n*$step_multiplier)\\:u\\:3}':x=10:y=h-th-10:fontsize=24:fontcolor=white"
    local fadeout="tpad=stop_mode=clone:stop_duration=8,fade=t=out:st=${fade_start}:d=5"
    local encoder=(
        -pix_fmt yuv420p
        -c:v libx265
        -preset slower
        -tune animation
        -crf 22
        -x265-params "keyint=${repeat}:min-keyint=$((repeat-1)):scenecut=0:ref=5:bframes=8:b-adapt=2:rc-lookahead=$((2*repeat)):lookahead-slices=4:aq-mode=3:aq-strength=0.8:deblock=-1,-1:sao=0"
    )

    ffmpeg -framerate "$frame_rate/$repeat" -pattern_type glob -i "*.png" \
        -vf "scale=${resolution},${drawtext},fps=${frame_rate},${fadeout}" \
        "${encoder[@]}" -y sample_x265.mp4
    if [ $? -ne 0 ]; then
        echo "Error: ffmpeg command failed."
        return 1
    fi

    conda activate
    echo "Process completed successfully."
}

# png2mp4()
# Converts a series of PNG images to an MP4 video using x264 encoding
#
# Usage: png2mp4 [--max <number>] [--step <number>] [--repeat <number>]
#
# Options:
#   --max <number>    : Maximum number of images to process
#   --step <number>   : Multiplier for step count in overlay text (default: 1)
#   --repeat <number> : Number of times to repeat each image (default: 1)
#
# This function:
# 1. Deactivates conda environment
# 2. Creates a temporary directory for processing
# 3. Finds all PNG files in the current directory
# 4. Uses the current directory name as the output filename prefix
# 5. Copies and optionally repeats images to the temp directory
# 6. Uses ffmpeg to create an MP4 with x264 encoding, including:
#    - Frame rate of 60 fps
#    - Image scaling to 1024x1024
#    - Step count overlay text (divided by 1,000,000 and truncated to remove 6 zeros and decimal places)
#    - CRF value of 28 for compression
# 7. Adds padding and fade-out effect to the final video
# 8. Cleans up temporary files
# 9. Reactivates conda environment
#
# Requirements:
#   - ffmpeg with libx264 support
#   - bc (basic calculator)
#   - Inconsolata-Light.ttf font in /usr/share/fonts/TTF/
png2mp4() {
    conda deactivate
    local max_images=""
    local step_multiplier=1
    local repeat=1
    local temp_dir="/home/kade/.local/tmp"

    while [[ "$#" -gt 0 ]]; do
        case $1 in
            --max) max_images="$2"; shift ;;
            --step) step_multiplier="$2"; shift ;;
            --repeat) repeat="$2"; shift ;;
            *) echo "Unknown parameter passed: $1"; return 1 ;;
        esac
        shift
    done

    echo "Creating temporary directory..."
    mkdir -p "$temp_dir"

    echo "Checking for PNG files..."
    png_files=($(/usr/bin/env ls *.png 2>/dev/null))
    if [ ${#png_files[@]} -eq 0 ]; then
        echo "Error: No PNG files found in the current directory."
        return 1
    fi

    echo "Setting output filename..."
    output_filename="$(basename "$(pwd)").mp4"
    echo "Output filename: $output_filename"

    echo "Creating repeated images..."
    for img in "${png_files[@]}"; do
        for i in $(seq 1 $repeat); do
            cp "$img" "$temp_dir/${img%.*}_${i}.png"
        done
    done

    echo "Running ffmpeg..."
    if [[ -n "$max_images" ]]; then
        ffmpeg -framerate 60 -pattern_type glob -i "$temp_dir/*.png" -vf "scale=1024x1024,select='not(mod(n\,$max_images))',drawtext=fontfile=/usr/share/fonts/TTF/Inconsolata-Light.ttf:text='Steps\: %{expr\:trunc(n*$step_multiplier/$repeat/1000000)}':x=10:y=h-th-10:fontsize=24:fontcolor=white" -crf 28 \
        -c:v libx264 -pix_fmt yuv420p -y "$temp_dir/temp.mp4"
    else
        ffmpeg -framerate 60 -pattern_type glob -i "$temp_dir/*.png" -vf "scale=1024x1024,drawtext=fontfile=/usr/share/fonts/TTF/Inconsolata-Light.ttf:text='Steps\: %{expr\:trunc(n*$step_multiplier/$repeat/1000000)}':x=10:y=h-th-10:fontsize=24:fontcolor=white" -crf 28 \
        -c:v libx264 -pix_fmt yuv420p -y "$temp_dir/temp.mp4"
    fi

    if [ $? -ne 0 ]; then
        echo "Error: ffmpeg command failed."
        rm -rf "$temp_dir"
        return 1
    fi

    echo "Processing final video..."
    duration=$(ffmpeg -i "$temp_dir/temp.mp4" 2>&1 | grep 'Duration' | awk '{print $2}' | tr -d , | awk -F: '{print ($1 * 3600) + ($2 * 60) + $3}')
    fade_start=$(echo "$duration + 3" | bc)
    ffmpeg -i "$temp_dir/temp.mp4" -vf "tpad=stop_mode=clone:stop_duration=8,fade=t=out:st=$fade_start:d=5" -c:v libx264 -pix_fmt yuv420p -y "$output_filename"

    if [ $? -ne 0 ]; then
        echo "Error: Final ffmpeg processing failed."
        rm -rf "$temp_dir"
        return 1
    fi

    echo "Cleaning up temporary files..."
    rm -rf "$temp_dir"

    conda activate
    echo "Process completed successfully."
}