GStreamer Editing Services
The "GStreamer Editing Services" is a library to simplify the creation of multimedia editing applications. Based on the GStreamer multimedia framework and the GNonLin set of plugins, its goals are to suit all types of editing-related applications.
The GStreamer Editing Services are cross-platform and work on most UNIX-like platform as well as Windows. It is released under the GNU Library General Public License (GNU LGPL).
Goals of GStreamer Editing Services
The GStreamer multimedia framework and the accompanying GNonLin set of plugins for non-linear editing offer all the building blocks for:
Decoding and encoding to a wide variety of formats, through all the available GStreamer plugins.
Easily choosing segments of streams and arranging them through time through the GNonLin set of plugins.
But all those building blocks only offer stream-level access, which results in developers who want to write non-linear editors to write a consequent amount of code to get to the level of non-linear editing notions which are closer and more meaningful for the end-user (and therefore the application).
The GStreamer Editing Services (hereafter GES) aims to fill the gap between GStreamer/GNonLin and the application developer by offering a series of classes to simplify the creation of many kind of editing-related applications.
Timeline and TimelinePipeline
The most top-level object encapsulating every other object is the GESTimeline. It is the central object for any editing project.
GESTimeline is a
GstElement. It can therefore be used in any
GStreamer pipeline like any other object.
Tracks and Layers
The GESTimeline can contain two types of objects (seen in "Layers and Tracks"):
Layers - Corresponds to the user-visible arrangement of clips, and what you primarily interact with as an application developer. A minimalistic timeline would only have one layer, but a more complex editing application could use as many as needed.
Tracks - Corresponds to the output streams in GStreamer. A typical GESTimeline, aimed at a video editing application, would have an audio track and a video track. A GESTimeline for an audio editing application would only require an audio track. Multiple layers can be related to each track.
In order to reduce even more the amount of GStreamer interaction the application developer has to deal with, a convenience GstPipeline has been made available specifically for Timelines : GESPipeline.
Initialization – GStreamer editing services initialization functions
GESTimeline – Multimedia timeline
GESLayer – Non-overlapping sequence of #GESClip
GESClip – Base class for elements that occupy a single #GESLayer and maintain equal timings of their children
GESPipeline – Convenience GstPipeline for editing.
GESProject – A GESAsset that is used to manage projects
GESEffect – adds an effect build from a parse-launch style bin description to a stream in a GESSourceClip or a GESLayer
GESTrack – The output source of a #GESTimeline
GESAsset – Represents usable resources inside the GStreamer Editing Services
GESExtractable Interface – An interface for objects which can be extracted from a #GESAsset
GESErrors – GError — Categorized error messages
GESGroup – Class for a collection of #GESContainer-s within a single timeline.
GESMetaContainer Interface – An interface for storing metadata
GESTextOverlay – render text onto another video stream in a GESLayer
GESFormatter – Timeline saving and loading.
GESTrackElement – Base Class for the elements of a #GESTrack
GES Enumerations – Various enums for the Gstreamer Editing Services
GES utilities – Convenience methods
GESMarkerList – implements a list of markers with metadata asociated to time positions
GESPitiviFormatter – A formatter for the obsolete Pitivi xptv project file format
GESUriClipAsset – A GESAsset subclass specialized in GESUriSource extraction
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