Skip to main content

FFmpeg tools in Rails Application

FFmpeg is an extremely powerful and versatile command line tool for converting any multimedia files. It is free and available for Windows, Mac and Linux machines. Whether you want to join two video files, extract the audio component from a video file, convert your video into an animated GIF, FFmpeg can do it all and even more.
FFmpeg commad synopsis
ffmpeg [global_options] {[input_file_options] -i input_url} ... {[output_file_options] output_url} ...
Some Basic and Useful Commands
  • Cut video file into a smaller clip
ffmpeg -i videoplayback.mp4 -ss 00:00:50 -codec copy -t 20 output.mp4
  • Convert video from one format to another
ffmpeg -i videoplayback.mp4 -c:v libx264 filename.wav
  • Mute a video (Remove the audio component)
ffmpeg -i videoplayback.mp4 -an mute-video.mp4
  • Convert Video into Images
ffmpeg -i videoplayback.mp4 -r 0.25 frames_%1d.png
  • Convert a video into animated GIF
ffmpeg -i videoplayback.mp4 -vf scale=500:400 -r 5 -t 00:00:30 image.gif
  • Add subtitles to a movie
ffmpeg -i videoplayback.mp4 -i subtitles.srt -c copy -c:v libx264 -crf 23 output.mkv
Steps to use FFmpeg commands in Ruby on Rails application:
  • FFmpeg must be installed in the system
  • Create .yml file in application to specify ffmpeg path as environment variable, you will get to know the ffmpeg path using command which ffmpeg in your system
  • You will have to specify ffmpeg command in rails application as system command Example is given below:
Syntax:- system("#{ENV['FFMPEG']} -i input.mp4 output.avi”)

Labels:
Location: 8, Gopal Nagar Main Rd, Gopal Nagar, Gayatri Nagar, Pratap Nagar, Nagpur, Maharashtra 440022, India

Comments

Post a Comment

Popular posts from this blog

GraphQL With Ruby

Now a day’s most of the web or mobile applications fetch data from server which is stored in a database. REST API provides an interface to stored data that require by the applications. GraphQL is a query language for REST API's not for server databases. It is database agnostic and effectively can be used in any context where an API is used. GraphQL provide platform for declarative data fetching where client need to specify what data needs from API in response. Instead of multiple endpoints that return fixed data structures, a GraphQL server only exposes a single endpoint and responds with precisely the data a client asked for. GraphQL minimizes the amount of data that needs to be transferred over the network and improves applications operating under these conditions. Introduction to GraphQL API on Ruby on Rails Start with adding gem in Gemfile gem ‘graphql’ Run command bundle install Run command rails generate graphql:install Above command will add gr...
3 comments
Read more

Best In Place Gem In Ruby On Rails Tutorial

The best_in_place gem is the easiest solution for in place editing in Ruby on Rails. This gem provides functionality of “in place editing” in ruby on rails without writing any extra ajax code. It supports text inputs, textarea, select dropdown, checkboxes, jQuery UI Datepickers, etc. Also Displays server-side validation Installation Steps of “best_in_place” Gem : Installing best_in_place is very easy and straight-forward. Just begin including the gem in your Gemfile: gem ‘best_in_place’ After that, specify the use of the jquery and best in place javascripts in your application.js, and optionally specify jquery-ui if you want to use jQuery UI datepickers: //= require jquery //= require best_in_place //= require jquery-ui //= require best_in_place.jquery-ui Then, just add a binding to prepare all best in place fields when the document is ready: $(document).ready(function() { /* Activating Best In Place */ jQuery(".best_in_place").best_in_place(); });...
1 comment
Read more

Data scraping in Ruby on Rails using Nokogiri and Mechanize Gem

What is Data scraping? Website/Data  Scraping  is a technique to operating large amounts of  data  from websites whereby the  data  is extracted and displayed in own sites or it can be stored to a File/Database. Data scraping is basically used where the websites does not provides API. Some Applications do not provide API to collect records. For the same , Data Scraping technique is used. The data can be scraped using Nokogiri Gem. The steps are required: Add the gem “gem ‘nokogiri’, ‘~> 1.8’, ‘>= 1.8.1'” . Then run the bundle install Add the “require ‘nokogiri'” , “require ‘open-uri'” line where you will write the code for the scraping. The controller of the page will look like below: The view of the code of view page will look like : The result in our application will look like: Mechanize Gem in rails The Mechanize library is used for automating interaction with websites. Mechanize automatically stor...
1 comment
Read more