Refactor Timelapse Tuner to merge multiple videos with audio
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README.org
35
README.org
@ -2,7 +2,7 @@
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[[https://gitlab.com/uploads/-/system/project/avatar/62789004/timelapse_tuner.png]]
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Timelapse Tuner is a Bash script that automates the process of creating timelapse videos with randomly selected background music. It merges a timelapse video file with a randomly chosen audio file from the current directory, applying fade-in and fade-out effects to the audio for a polished result. It now supports both horizontal and vertical video output!
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Timelapse Tuner is a Bash script that automates the process of creating timelapse videos with randomly selected background music. It can merge multiple timelapse video files and combine them with a randomly chosen audio file from the current directory, applying fade-in and fade-out effects to the audio for a polished result. It supports both horizontal and vertical video output!
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* Video Demo
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:PROPERTIES:
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@ -18,10 +18,11 @@ Timelapse Tuner is a Bash script that automates the process of creating timelaps
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:ID: f0a43fa6-6a89-409e-a72b-83145dd70e0c
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:END:
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- Merges a specified timelapse video file with a randomly selected MP3 audio file
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- Merges multiple timelapse video files into a single video
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- Combines the merged video with a randomly selected MP3 audio file
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- Applies fade-in and fade-out effects to the audio for smooth transitions
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- Randomly selects a start point in the audio file to add variety
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- Supports custom input timelapse video and output file specification
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- Supports custom input timelapse videos and output file specification
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- Allows customization of fade duration
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- Provides option to convert horizontal videos to vertical format
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- Provides detailed logging of the merging process
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@ -66,7 +67,7 @@ You will also need to provide your own MP3 files for background music. If you ne
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Run the script with the following command:
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#+BEGIN_SRC sh
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./tt --video <input_timelapse_video> --output <output_file> [--fade <fade_duration>] [--vertical]
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./tt --video <video_file1> [<video_file2> ...] --output <output_file> [--fade <fade_duration>] [--vertical]
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#+END_SRC
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** Options:
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@ -74,7 +75,7 @@ Run the script with the following command:
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:ID: 9afd9a28-f9bf-47f0-a154-ff51f72c67e8
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:END:
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- =--video=: Specify the input timelapse video file (required)
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- =--video=: Specify one or more input video files (at least one is required)
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- =--output=: Specify the output MP4 file name (optional, default: output_video.mp4)
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- =--fade=: Specify the fade duration in seconds (optional, default: 2)
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- =--vertical=: Convert the video to vertical format (optional, default: horizontal)
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@ -84,14 +85,14 @@ Run the script with the following command:
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:ID: 0b930521-693e-49de-af95-fc7004264b30
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:END:
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For horizontal output (default):
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For merging multiple horizontal videos (default):
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#+BEGIN_SRC sh
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./tt --video my_timelapse.mp4 --output final_timelapse.mp4 --fade 3
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./tt --video timelapse1.mp4 timelapse2.mp4 timelapse3.mp4 --output merged_timelapse.mp4 --fade 3
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#+END_SRC
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For vertical output:
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For merging multiple videos and converting to vertical format:
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#+BEGIN_SRC sh
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./tt --video my_timelapse.mp4 --output vertical_timelapse.mp4 --fade 3 --vertical
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./tt --video timelapse1.mp4 timelapse2.mp4 --output vertical_timelapse.mp4 --fade 3 --vertical
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#+END_SRC
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* How It Works
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@ -100,14 +101,15 @@ For vertical output:
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:END:
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1. The script checks for the required dependencies (FFmpeg, FFprobe, bc).
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2. It verifies the input timelapse video file exists.
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2. It verifies that all input video files exist.
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3. A random MP3 file is selected from the current directory to serve as background music.
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4. The lengths of both the timelapse video and audio files are calculated.
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5. Fade-in and fade-out durations are set (default 2 seconds, customizable with --fade) for smooth audio transitions.
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6. A random start point in the audio file is selected to ensure variety in the background music.
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7. If the --vertical option is used, the video is scaled and cropped to 1080x1920 resolution.
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8. FFmpeg is used to merge the timelapse video with the selected portion of the audio, applying fade effects and any necessary format conversion.
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9. The final timelapse video with background music is saved as an MP4 file.
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4. The lengths of all video files and the audio file are calculated.
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5. If multiple video files are provided, they are concatenated in the order specified.
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6. Fade-in and fade-out durations are set (default 2 seconds, customizable with --fade) for smooth audio transitions.
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7. A random start point in the audio file is selected to ensure variety in the background music.
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8. If the --vertical option is used, the combined video is scaled and cropped to 1080x1920 resolution.
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9. FFmpeg is used to merge the concatenated video with the selected portion of the audio, applying fade effects and any necessary format conversion.
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10. The final timelapse video with background music is saved as an MP4 file.
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* Providing Background Music
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:PROPERTIES:
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@ -136,6 +138,7 @@ If you encounter any issues:
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2. Check that you have read/write permissions in the current directory.
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3. Verify that there are MP3 files in the same directory as the script for background music.
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4. If FFmpeg fails, check the error message for details on what went wrong.
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5. When using multiple input videos, ensure they have compatible formats and resolutions.
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* Contributing
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:PROPERTIES:
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69
tt
69
tt
@ -24,9 +24,9 @@ command_exists() {
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# Function to print usage information
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print_usage() {
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echo "Usage: $0 --video <video_file> --output <output_file> [--fade <fade_duration>] [--vertical]"
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echo "Usage: $0 --video <video_file1> [<video_file2> ...] --output <output_file> [--fade <fade_duration>] [--vertical]"
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echo "Options:"
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echo " --video Specify the input video file"
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echo " --video Specify one or more input video files"
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echo " --output Specify the output MP4 file name (default: output_video.mp4)"
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echo " --fade Specify the fade duration in seconds (default: 2)"
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echo " --vertical Convert the video to vertical format (default: horizontal)"
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@ -38,7 +38,7 @@ log_message() {
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}
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# Initialize variables
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video_file=""
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video_files=()
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output_file="output_video.mp4"
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fade_duration=2
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vertical=false
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@ -47,8 +47,11 @@ vertical=false
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while [[ $# -gt 0 ]]; do
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case $1 in
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--video)
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video_file="$2"
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shift 2
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shift
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while [[ $# -gt 0 && ! $1 == --* ]]; do
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video_files+=("$1")
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shift
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done
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;;
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--output)
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output_file="$2"
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@ -80,19 +83,21 @@ for cmd in ffmpeg ffprobe bc; do
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done
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log_message "All required programs found"
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# Check if a video file is provided
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if [ -z "$video_file" ]; then
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log_message "Error: No video file specified"
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# Check if video files are provided
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if [ ${#video_files[@]} -eq 0 ]; then
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log_message "Error: No video files specified"
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print_usage
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exit 1
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fi
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# Check if the video file exists
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if [ ! -f "$video_file" ]; then
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log_message "Error: Video file '$video_file' not found"
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exit 1
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fi
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log_message "Input video file: $video_file"
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# Check if all video files exist
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for video_file in "${video_files[@]}"; do
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if [ ! -f "$video_file" ]; then
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log_message "Error: Video file '$video_file' not found"
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exit 1
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fi
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done
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log_message "Input video files: ${video_files[*]}"
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# Pick a random .mp3 file from the current directory
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log_message "Selecting a random MP3 file..."
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@ -112,14 +117,24 @@ log_message "Audio length: $audio_length seconds"
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log_message "Fade duration set to $fade_duration seconds"
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# Get the length of the video file in seconds
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log_message "Calculating video file length..."
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video_length=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$video_file")
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log_message "Video length: $video_length seconds"
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# Prepare FFmpeg command for video concatenation
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concat_filter="concat=n=${#video_files[@]}:v=1:a=0"
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video_inputs=""
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for i in "${!video_files[@]}"; do
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video_inputs+="-i \"${video_files[$i]}\" "
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done
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# Calculate total video length
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total_video_length=0
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for video_file in "${video_files[@]}"; do
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video_length=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$video_file")
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total_video_length=$(echo "$total_video_length + $video_length" | bc)
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done
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log_message "Total video length: $total_video_length seconds"
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# Use the shorter of the two lengths for fade-out calculation
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log_message "Calculating minimum length for fade-out..."
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min_length=$(echo "if ($video_length < $audio_length) $video_length else $audio_length" | bc)
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min_length=$(echo "if ($total_video_length < $audio_length) $total_video_length else $audio_length" | bc)
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log_message "Minimum length: $min_length seconds"
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# Ensure fade-out starts at a valid time
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@ -130,9 +145,9 @@ if (( $(echo "$fade_out_start < 0" | bc -l) )); then
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fi
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log_message "Fade-out starts at: $fade_out_start seconds"
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# Calculate a random start time within the audio length minus the video length
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# Calculate a random start time within the audio length minus the total video length
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log_message "Calculating random start time for audio..."
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max_start=$(echo "$audio_length - $video_length" | bc | cut -d'.' -f1)
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max_start=$(echo "$audio_length - $total_video_length" | bc | cut -d'.' -f1)
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if [ "$max_start" -lt 0 ]; then
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random_start=0
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else
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@ -141,15 +156,17 @@ fi
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log_message "Random start time: $random_start seconds"
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# Prepare FFmpeg command
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ffmpeg_command="ffmpeg -loglevel error -stats -i \"$video_file\" -ss $random_start -i \"$audio_file\""
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ffmpeg_command="ffmpeg -loglevel error -stats $video_inputs -ss $random_start -i \"$audio_file\" -filter_complex \""
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if $vertical; then
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log_message "Converting to vertical format..."
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ffmpeg_command+=" -filter_complex \"[0:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1[v];[1:a]afade=t=in:st=0:d=$fade_duration,afade=t=out:st=$fade_out_start:d=$fade_duration[a]\""
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ffmpeg_command+="$concat_filter [v_concat]; [v_concat]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,setsar=1[v];"
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ffmpeg_command+="[${#video_files[@]}:a]afade=t=in:st=0:d=$fade_duration,afade=t=out:st=$fade_out_start:d=$fade_duration[a]\""
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ffmpeg_command+=" -map \"[v]\" -map \"[a]\""
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else
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ffmpeg_command+=" -filter_complex \"[1:a]afade=t=in:st=0:d=$fade_duration,afade=t=out:st=$fade_out_start:d=$fade_duration[a]\""
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ffmpeg_command+=" -map 0:v -map \"[a]\""
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ffmpeg_command+="$concat_filter [v_concat];"
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ffmpeg_command+="[${#video_files[@]}:a]afade=t=in:st=0:d=$fade_duration,afade=t=out:st=$fade_out_start:d=$fade_duration[a]\""
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ffmpeg_command+=" -map \"[v_concat]\" -map \"[a]\""
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fi
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ffmpeg_command+=" -c:v libx264 -c:a aac -shortest \"$output_file\""
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@ -161,7 +178,7 @@ eval $ffmpeg_command
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# Check if ffmpeg was successful
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if [ $? -eq 0 ]; then
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log_message "ffmpeg process completed successfully"
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log_message "Merged $video_file with random audio: $audio_file"
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log_message "Merged ${#video_files[@]} video files with random audio: $audio_file"
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log_message "Audio starts at $random_start seconds, with fade-in/out effects"
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if $vertical; then
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log_message "Video converted to vertical format"
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