VideoMaker

Creating a video using static images, GIFs, music and a fade in effect using ffmpeg.

How to use the Bash version?

Install ffmpeg on your system.
Open the terminal.
Unzip the sample video.zip file.
Paste the make.sh file into that folder.
Make the script executable by running chmod +x make.sh
Run ./make.sh.
The output.mp4 file will be created.

How to use the JavaScript version?

Install ffmpeg on your system.
Open the terminal.
Unzip the sample video.zip file.
Paste the make.js file into that folder.
Run node make.
The output.mp4 file will be created.

How does it work?

The script will read the input_video.cfg file.
The script will read the input_audio.cfg file (optional file).
The script will read the input_gifs.cfg file (optional file).
The input_video.cfg file must contain all the slides and how many seconds that slide must be displayed. For example:

slide001.png, 5
slide002.png, 3
slide003.png, 8.5
slide004.png, 4
slide005.png, 6.2
slide006.png, 2

The input_audio.cfg file must contain all the audio files and how many seconds of delay there will be for each audio file. For example:

music.mp3,0
voice001.wav, 1.5
voice002.wav, 3
voice003.wav, 5
voice004.wav, 7.8

The input_gifs.cfg file must contain all the gif files that are going to be displayed during the video. For example:

gif001.gif, 0, 150, 150, 256, 256, 3, 5
gif002.gif, 0, 300, 300, 256, 256, 6, 8
gif003.gif, 0, 450, 450, 256, 256, 9, 10

The required values for each row are:

filename (string)
ignore_loop (0 or 1)
x (integer)
y (integer)
width (integer)
height (integer)
fade_in_after (seconds)
fade_out_after (seconds)

Things to know:

Every slide (image file) must have the exact same width and height.
The created video will have the same resolution of the slides.
To have a fade in from a black screen when the video starts, you have to create a slide001.png file that must contain a black image and then the first two lines in the input_video.cfg should be:

slide001.png, 0
slide002.png, 1

A workflow for GitHub Actions was created in this repository that shows how to create a video and attach it to the job as an artifact.

Useful ffmpeg commands

# Increasing the volume of an audio file:
ffmpeg -i voice.wav -filter:a "volume=1.5" voice_edited.wav

# Decreasing the volume of an audio file:
ffmpeg -i voice.wav -filter:a "volume=0.5" voice_edited.wav

# Changing the kbps of an audio file:
ffmpeg -i voice.wav -b:a 128k voice_edited.wav

# Converting an audio file from stereo to mono:
ffmpeg -i voice.wav -ac 1 voice_edited.wav

# Changing the sample rate of an audio file:
ffmpeg -i voice.wav -ar 22050 voice_edited.wav

# Cutting the first 20 seconds of an audio/video file:
ffmpeg -i voice.wav -ss 20 voice_edited.wav

# Cutting the first 20 seconds and getting only the next 5 seconds of an audio/video file:
ffmpeg -i voice.wav -ss 20 -t 5 voice_edited.wav

# Getting the first 5 seconds of an audio/video file:
ffmpeg -i voice.wav -t 5 voice_edited.wav

# Adding a 5 seconds fade in to an audio file:
ffmpeg -i music.mp3 -af "afade=t=in:st=0:d=5" music_edited.mp3

# Adding a 5 seconds fade out after 30 seconds to an audio file:
ffmpeg -i music.mp3 -af "afade=t=out:st=30:d=5" music_edited.mp3

# Converting a MP4 file to a GIF file without scaling:
ffmpeg -i video.mp4 -filter_complex 'fps=24,scale=-1:-1:flags=lanczos,split [o1] [o2];[o1] palettegen [p]; [o2] fifo [o3];[o3] [p] paletteuse' video.gif

# Converting a MP4 file to a scaled GIF file (320px width):
ffmpeg -i video.mp4 -filter_complex 'fps=24,scale=320:-1:flags=lanczos,split [o1] [o2];[o1] palettegen [p]; [o2] fifo [o3];[o3] [p] paletteuse' video.gif

# Cropping a MP4 file that has a 1080x2316 resolution to a 1080x2030 video file using a Y offset of 110 pixels:
ffmpeg -i video.mp4 -filter:v "crop=1080:2030:0:110" -c:a copy video_edited.mp4

lrusso/VideoMaker

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