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Release notes for GStreamer 0.9.6 "Always On Time"

The GStreamer team is petrified to announce a new release in the 0.9.x development series of the core of the GStreamer streaming media framework.

The 0.9.x series is a development series and not recommended for end users. It is not API or ABI compatible with the stable 0.8.x series. It is, however, parallel installable with the 0.8.x series.

The main focus of the 0.9 series is to make GStreamer threadsafe.

This module, gstreamer, only contains core functionality. For actual media playback, you will need other modules.

contains a basic set of well-supported plug-ins
contains a set of well-supported plug-ins under our preferred license
contains a set of well-supported plug-ins, but might pose problems for distributors
contains a set of less supported plug-ins that haven't passed the rigorous quality testing we expect

Features of this release

  • Parallel installability with 0.8.x series
  • Threadsafe design and API
  • API changes and clean-up
  • Extensive documentation updates
  • remove GLib 2.4 compatibility
  • added clock selection
  • added network clocking
  • added fd:// URI handler
  • added more fraction functionality

Bugs fixed in this release

  • 143472 : [api] gst_tag_list_foreach() takes a non-const GstTagList*
  • 156633 : [API] don't use same API for arrays as for normal lists
  • 164168 : circular pipeline fails to negotiate
  • 165650 : [API] gst_value_deserialize doesn't work correctly for NU...
  • 168438 : [API] GstIndexFilter doesn't receive user_data
  • 168494 : [API] gst_index_add_object() does nothing
  • 305291 : Obnoxious bug-filing request
  • 311489 : Possible gstghostpad locking problems
  • 319178 : [API] finish filler events and support them in GstCollect...
  • 319388 : 0.9 API changes tracker
  • 319389 : state change updates obsolete some functions
  • 319392 : GstEventType is not bindings-friendly
  • 319395 : Macro name/visibility API bugs
  • 319940 : Use GLIB macros for GCC extensions
  • 320060 : add a CORE error category for missing ELEMENTS/PLUGINS
  • 320097 : GST_BUFFER_FLAG_ORIGINAL should die
  • 320113 : [API] duration message changes
  • 320299 : gst_pad_send_event should take stream lock for serialized...
  • 320324 : [API] GST_FOURCC_FORMAT should drop leading '%'
  • 320423 : [API] padding for GstCollectData
  • 320766 : [API] collect pads API changes
  • 321061 : GstURI not used
  • 321235 : [API] GST_PAD_IS_USABLE should be removed
  • 321386 : [SEGFAULT] basetransform when doing reverse caps negotiation
  • 321452 : GstPad's " template " property is b0rked
  • 321528 : capsfilter: assertion `caps != NULL' failed
  • 321595 : GstBin doesn't clean the message queue when changing stat...
  • 321638 : Don't use // style comments in headers
  • 321648 : Wrong type check in gst_message_parse_clock_lost
  • 321710 : GstClock resolution functions should take a GstClockTime
  • 321712 : GstClock adjust function changes
  • 321875 : gst_plugin_check_file disappeared
  • 321950 : gst_registry_scan_paths lacks implementation
  • 321962 : [easyfix] gst_value_is_fixed uses gst_value_list_* on GST...
  • 322027 : [API] Rename gst_caps_structure_fixate_* to gst_structure...
  • 322034 : Elements should be updated not to take the stream lock in...
  • 322069 : Names of GstTagSetter methods should be more descriptive
  • 322134 : API master/slave clocks
  • 322139 : our elements are confused about GEnumValue and which is t...


You can find source releases of gstreamer in the gstreamer download directory.

The git repository and details how to clone it can be found at .


The project's website is

Support and Bugs

We use GNOME's bugzilla for bug reports and feature requests.

Please submit patches via bugzilla as well.

For help and support, please subscribe to and send questions to the gstreamer-devel mailing list (see below for details).

Find us on IRC at #gstreamer.


Git is hosted on You can browse the gstreamer repository.

All code is in Git and can be checked out from there.

Interested developers of the core library, plugins, and applications should subscribe to the gstreamer-devel list.


At this point, ports of existing applications to 0.9 are still experimental. A patch for Totem is maintained at A patch for Rhythmbox is maintained at Jamboree has a branch with the tag "jamboree-gst-0.9" that works against GStreamer 0.9. Flumotion has been mostly ported to 0.9 as well.

Contributors to this release

  • Alessandro Dessina
  • Andy Wingo
  • Daniel Fischer
  • Edward Hervey
  • Jan Schmidt
  • Johan Dahlin
  • Julien MOUTTE
  • Michael Smith
  • Stefan Kost
  • Thomas Vander Stichele
  • Tim-Philipp Müller
  • Torsten Schoenfeld
  • Wim Taymans

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