samyabh / IDM_projet

Generator Videos

BY : Samy Abdallah & Matthieu Colliaux

The project objective was to create a generator of video from a textual specification VideoGen.

Motivation

This project allowed us to use in concrete way the engineering models by performing a grammar, metamodels and transformations. We became aware of the possibilities offered by the engineering models especially when developing the playlist metamodel(playList.ecore), which has allowed us to create a playlist without any disctinction of variants videos (mandatory, optional, alternative).

Technologies

Xtext project : "videogen/Videogen.xtext" Definition of the grammar for generator videos DSL.

Xtend : "transformation/transformation.xtend" The xtend file contain all transformations (model-to-text, model-tomodel..)

Ecore/EMF :

• "videogen/Videogen.ecore"
• "playlistgen/PlayList.ecore"

Metamodelisation with Ecore. Metamodels will allow to properly express videogens instances or playlists instances.

FFmpeg : https://www.ffmpeg.org/ Cross-platform solution to record, convert and stream audio and video.

Flowplayer: https://flowplayer.org/ Flash video player, for reading the playlist created(.m3u8).

VLC http://vlc-media-player.org/ Media Player, for reading videos (.mp4,.ts) and the playlist created.

Content repository

• Xtext project with a grammar
• Metamodels Ecore
• Java code generate from Metamodels
• Xtend project with transformations
• A Videogen specification (videogen.mydsl)
• Videos folder with all videos present in the Videogen specification.
• A folder with the video player : Flowplayer
• A screencast of demonstration

How to use the generator ?

• Import the project in your IDE
• !Important! the folders "/videosts" and "/vignettes" have to be empty before any executions
• Run /transformation/transformation.xtend
• To create only a playlist in .m3u8 (extended format):
  • comment all main's instructions except :

var transformation = new Transformation()
var videoGen =transformation.VideoGenerator(URI.createURI("videogen.mydsl"))
var playlist = transformation.VideotoPlayList(videoGen)
transformation.PlaylistToM3Uetendue(URI.createURI("playlistflow.m3u8"),playlist)
transformation.generationHTMLFlowplayer(URI.createURI("playerHTML.html"))

• Run transformation.xtend
• What we get : - A playlist with videos randomly generated : transformation/playlistflow.m3u8 - thumbnails of videos created in videos/vignettes/ - converted videos in ".ts" in videos/videosts/ - Generate an HTML page with flowplayer
• You can read the playlist generated with VLC

Also, you can watch the screencast. Enjoy

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