tovrstra / gluemp4

Trim, crop and concatenate MP4 fragments with ffmpeg

GlueMP4

GlueMP4 is a simple driver script for ffmpeg to trim, crop and concatenate MP4 video fragments. It was developed to combine fragments of a lecture, recorded by screencasting on a tablet, into a single video clip.

Installation

pip install git+https://github.com/tovrstra/gluemp4.git@master

You also need to install ffmpeg separately:

• On Fedora Linux, first activate RPM Fusion. Then run the following install command:

  sudo dnf install ffmpeg --allowerasing

Usage

Make a YAML config file config.yaml describing the fragments going into the video clip:

fragments:
- ["some_file1.mp4", "width:height:xleft:ytop", start, stop or null]
- ["some_file2.mp4", "width:height:xleft:ytop", start, stop or null]
- ...
output: final_output.mp4

Then run gluemp4 config.yaml.

How to determine the cropping region?

Take a single snapshot from your video, e.g. with ffmpeg at second 3 of the video:

ffmpeg -i input.mp4 -ss 3.0 -f image2 -vframes 1 snapshot.jpeg

Then open the image snapshot.jpeg in teh Gimp and draw a rectangle with the cropping tool, e.g. one that fits neatly your slide. Do not crop yet, just read the parameters of the cropping window and copy them to the config file.