To check if you’re having such an issue, run ffmpeg with frei0r effects:įfmpeg -v debug -i 1.mp4 -vf frei0r=glow:0.5 output.mpg The first time I installed ffmpeg with Frei0r, its effects didn’t work well. If you’re running macOS, you can use homebrew for installation.īrew install ffmpeg -with-fdk-aac -with-frei0r -with-libvo-aacenc -with-libvorbis -with-libvpx -with-opencore-amr -with-openjpeg -with-opus -with-schroedinger -with-theora -with-toolsĮven though you might not need all of these options for the current project, I’ve tried to include as many options as possible to avoid any issues. Install FFmpeg and all necessary software: the Frei0r plugin, mongoDB and redis, ruby, rails, and rvm. You can find the full Video Manipulator project in this GitHub repository. I’ll put the results of my latest experiments in my third article. All these features are going to be added to the application I developed in my first article. Here I'm going to describe more advanced things like video and audio filters, reading metadata, taking screenshots for each second of video, and monitoring processing progress in real time with Action Cable. There are many blurring algorithms available, but for this task, we will be using boxblur.This is the second article in my series on video processing with Rails.

The next component is to generate a blurred video. Keep in mind, all outputs created in the filtergraph must be connected to an output. The result will be 2 files with different resolutions.

-map '' 360p.mp4 and -map '' 720p.mp4 take each respective output and encodes it to a file.

The -2 is to tell the scaler to scale to a even number as some formats do not support a odd number of pixels

scale=-2:360 and scale=-2:720 scales the input to 360px and 720pxheight respectively while preserving aspect ratio and sends the output back to the same input name.split=2: Split the stream into 2 and store them as 360pand 720p.0:v: Select the first input source’s videostream only.

Ffmpeg map filter