GStreamer 1.26.3 stable bug fix release

[Tim-Philipp Müller]

The GStreamer team is pleased to announce another bug fix release in
the stable 1.26 release series.


This release only contains bug fixes as well as a security fix and some
important playback fixes.

It should be safe to upgrade from 1.26.x and we would recommend you
update at your earliest convenience.

Release notes with details about changes and fixed bugs can be found
at:

   https://gstreamer.freedesktop.org/releases/1.26/#1.26.3


Highlights:

* Security fix [1] for the H.266 video parser
* Fix regression for WAV files with acid chunks
* Fix high memory consumption caused by a text handling regression in
uridecodebin3 and playbin3
* Fix panic on late GOP in fragmented MP4 muxer
* Closed caption conversion, rendering and muxing improvements
* Decklink video sink preroll frame rendering and clock drift handling
fixes
* MPEG-TS demuxing and muxing fixes
* MP4 muxer fixes for creating very large files with faststart support
* New thread-sharing 1:N inter source and sink elements, and a ts-
rtpdtmfsrc
* New speech synthesis element around ElevenLabs API
* RTP H.265 depayloader fixes and improvements, as well as TWCC and
GCC congestion control fixes
* Seeking improvements in DASH client for streams with gaps
* WebRTC sink and source fixes and enhancements, including to LiveKit
and WHIP signallers
* The macOS osxvideosink now posts navigation messages
* QtQML6GL video sink input event handling improvements
* Overhaul detection of hardware-accelerated video codecs on Android
* Video4Linux capture source fixes and support for BT.2100 PQ and
1:4:5:3 colorimetry
* Vulkan buffer upload and memory handling regression fixes
* gst-python: fix various regressions introduced in 1.26.2
* cerbero: fix text relocation issues on 32-bit Android and fix broken
VisualStudio VC templates
* packages: ship pbtypes plugin and update openssl to 3.5.0 LTS
* Various bug fixes, build fixes, memory leak fixes, and other
stability and reliability improvements

Our latest security advisories can be found at:

https://gstreamer.freedesktop.org/security/


Binaries for Android, iOS, Mac OS X and Windows should be available
soon.

As always, please let us know of any issues you run into by filing an
issue or Merge Request in GitLab [2]:

Thanks!


[1] Security fix
    https://gstreamer.freedesktop.org/security/sa-2025-0007.html
[2] GitLab https://gitlab.freedesktop.org/gstreamer/gstreamer/
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