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GES.html
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<!DOCTYPE html>
<html lang="en">
<head>
<base href=".">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<title>GES</title>
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<p><b>The Pitivi Developer Documentation</b></p>
</div>
</div>
</div>
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<main>
<div data-extension="core" data-hotdoc-in-toplevel="True" data-hotdoc-project="Pitivi" data-hotdoc-ref="GES.html" class="page_container" id="page-wrapper">
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<h1 id="ges">GES</h1>
<p>GES (GStreamer Editing Services) is a cross-platform library that sits
on top of <a href="http://en.wikipedia.org/wiki/GStreamer">GStreamer</a> and
Non-Linear Engine. GES simplifies the
creation of multimedia editing applications. Basically, GES is a
complete <a href="http://en.wikipedia.org/wiki/Sdk">SDK</a> for making a video
editor (but not only that).</p>
<p>Traditionally, Pitivi was a user interface and a homemade video editing
“core” (or “backend”) that interacted directly with
<a href="attic/GNonLin.html">GNonLin</a>. Starting in version
<a href="releases/0-91.html">0.91</a>, Pitivi's core has been replaced by GES. This
means that Pitivi is mostly only a user interface on top of GES.
Starting in version <a href="releases/0-95.html">0.95</a>, GNonLin has been replaced
by Non-Linear Engine to improve stability.</p>
<p>GES does not aim at serving the needs of Pitivi only: we are building
the platform of the future and breaking the cycle of failed projects.
Indeed, other applications are already using GES or migrating to it.</p>
<blockquote>
<p><em>“Pitivi is one of the 'generous' projects that develops not just an
editor, but a set of libraries to implement editors. [Applications
built on top of those libraries] are not really re-inventing the
wheel, they can piggyback on top of the work that these folks are
doing, and then implement UI features that they care about the
most.”</em><br>
— Bassam Kurdali, director of <a href="https://en.wikipedia.org/wiki/Elephants_Dream">Elephants
Dream</a> and
<a href="http://urchn.org">Tube</a>.</p>
</blockquote>
<p>In addition to the fact that GES encourages code reuse among audio/video
editing software, here are some concrete advantages that we've noticed
while porting Pitivi to GES:</p>
<ul>
<li>It solves many architectural issues of the past.</li>
<li>It vastly simplifies Pitivi development:
<ul>
<li>More than 20 000 lines of code have been removed from Pitivi as
a result</li>
<li>
<a href="http://jeff.ecchi.ca/blog/2012/01/12/spring-clean-up-in-january/">A big
cleanup</a>
of the Pitivi codebase was done in early 2011, significantly
reducing the amount of modules/files to deal with.</li>
<li>No more confusion between the UI and backend parts</li>
<li>Much less GStreamer knowledge is required to contribute to
Pitivi itself.</li>
</ul>
</li>
<li>It has much better performance.</li>
</ul>
<p>Further reading for contributors:</p>
<ul>
<li>See the <a href="Architecture.html">Architecture</a> page for a visual
overview of the relationship between Pitivi, GES, Non-Linear Engine
and other components.</li>
<li>Read the <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/">GES API reference
documentation</a>
if you need to interact with GES. This documentation can also be
found locally in the “docs/libs/html/” subdirectory of your GES git
checkout.</li>
<li>
<a href="http://blogs.gnome.org/edwardrv/2009/11/30/the-result-of-the-past-few-months-of-hacking/">The initial GES
announcement</a>,
which explains why GES was created, what its various components are
and how it fits with GStreamer.</li>
</ul>
</div>
</div>
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<p>The results of the search are</p>
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<div class="edit-button">
<a href="https://gitlab.gnome.org/GNOME/pitivi/edit/master/docs/GES.md" data-hotdoc-role="edit-button">Edit on GitLab</a>
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