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burakaksoy/speedup_all_videos.sh

Last active September 23, 2024 14:36
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Revisions

  1. burakaksoy revised this gist Sep 23, 2024. 1 changed file with 70 additions and 18 deletions.
    88 changes: 70 additions & 18 deletions speedup_all_videos.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -1,35 +1,65 @@
    #!/bin/bash

    # Speed Up Video Script for All .mp4 Files in Directory
    # This script speeds up all video files in the current directory using mencoder.
    # Speed Up All Videos Script using ffmpeg
    # This script speeds up all .mp4 video files in the current directory using ffmpeg.
    # By default, the output videos will have no sound.
    #
    # Install:
    # sudo apt install mencoder
    # sudo apt install ffmpeg
    #
    # Save this script as: speedup_all_videos.sh
    #
    # Make it executable with:
    # chmod +x speedup_all_videos.sh
    #
    # Usage example:
    # ./speedup_all_videos.sh 6
    # Usage examples:
    # ./speedup_all_videos.sh 6 # Speeds up all videos by 6x, no sound
    # ./speedup_all_videos.sh 6 --audio # Speeds up all videos and audio by 6x, pitch changes
    # ./speedup_all_videos.sh 6 --audio --keep-pitch # Speeds up all videos and audio by 6x, keeps original pitch
    #
    # Idea Based on: https://superuser.com/a/160448/1461742
    # Pure command:
    # mencoder input.mp4 -speed 6 -o input-6x.mp4 -ovc copy -nosound
    # mencoder input.mp4 -speed 6 -o input-6x.mp4 -ovc copy -oac copy

    # Check if the correct number of arguments was provided
    if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <speed_scale>"
    # Idea is based on: https://superuser.com/q/160432/1461742

    # Check if at least 1 argument was provided
    if [ "$#" -lt 1 ]; then
    echo "Usage: $0 <speed_scale> [--audio] [--keep-pitch]"
    exit 1
    fi

    # The speed scale
    # Parse arguments
    speed_scale="$1"
    audio=false
    keep_pitch=false

    shift 1

    while (( "$#" )); do
    case "$1" in
    --audio)
    audio=true
    shift
    ;;
    --keep-pitch)
    keep_pitch=true
    shift
    ;;
    *)
    echo "Unknown option: $1"
    echo "Usage: $0 <speed_scale> [--audio] [--keep-pitch]"
    exit 1
    ;;
    esac
    done

    # Check if there are any .mp4 files in the current directory
    shopt -s nullglob
    mp4_files=(*.mp4 *.avi *.mkv)
    if [ ${#mp4_files[@]} -eq 0 ]; then
    echo "No .mp4 or .avi or .mkv files found in the current directory."
    exit 1
    fi

    # Loop through all .mp4 files in the current directory
    for input_file in *.mp4; do
    for input_file in "${mp4_files[@]}"; do
    # Extract filename without extension
    filename=$(basename -- "$input_file")
    extension="${filename##*.}"
    @@ -38,8 +68,30 @@ for input_file in *.mp4; do
    # Construct output filename
    output_file="${filename}-${speed_scale}x.${extension}"

    # Execute mencoder to speed up the video
    mencoder "$input_file" -speed "$speed_scale" -o "$output_file" -ovc copy -nosound
    if [ "$audio" = false ]; then
    # No audio
    ffmpeg -i "$input_file" -filter:v "setpts=PTS/$speed_scale" -an "$output_file"
    else
    if [ "$keep_pitch" = true ]; then
    # Speed up audio but keep pitch
    # Calculate inverse of speed_scale
    inv_speed=$(echo "1/$speed_scale" | bc -l)
    ffmpeg -i "$input_file" -filter_complex \
    "[0:v]setpts=PTS/$speed_scale[v]; \
    [0:a]asetrate=44100*$speed_scale,aresample=44100,atempo=$inv_speed[a]" \
    -map "[v]" -map "[a]" "$output_file"
    else
    # Speed up audio with pitch change
    if (( $(echo "$speed_scale < 0.5" | bc -l) )); then
    echo "Error: atempo filter supports values between 0.5 and 100"
    exit 1
    fi
    ffmpeg -i "$input_file" -filter_complex \
    "[0:v]setpts=PTS/$speed_scale[v]; \
    [0:a]atempo=$speed_scale[a]" \
    -map "[v]" -map "[a]" "$output_file"
    fi
    fi

    echo "Output file created: $output_file"
    done
    done
  2. burakaksoy created this gist Jun 9, 2024.
    45 changes: 45 additions & 0 deletions speedup_all_videos.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,45 @@
    #!/bin/bash

    # Speed Up Video Script for All .mp4 Files in Directory
    # This script speeds up all video files in the current directory using mencoder.
    #
    # Install:
    # sudo apt install mencoder
    #
    # Save this script as: speedup_all_videos.sh
    #
    # Make it executable with:
    # chmod +x speedup_all_videos.sh
    #
    # Usage example:
    # ./speedup_all_videos.sh 6
    #
    # Idea Based on: https://superuser.com/a/160448/1461742
    # Pure command:
    # mencoder input.mp4 -speed 6 -o input-6x.mp4 -ovc copy -nosound
    # mencoder input.mp4 -speed 6 -o input-6x.mp4 -ovc copy -oac copy

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

    # The speed scale
    speed_scale="$1"

    # Loop through all .mp4 files in the current directory
    for input_file in *.mp4; do
    # Extract filename without extension
    filename=$(basename -- "$input_file")
    extension="${filename##*.}"
    filename="${filename%.*}"

    # Construct output filename
    output_file="${filename}-${speed_scale}x.${extension}"

    # Execute mencoder to speed up the video
    mencoder "$input_file" -speed "$speed_scale" -o "$output_file" -ovc copy -nosound

    echo "Output file created: $output_file"
    done