VVC/H.266 Alpha Channel support in GStreamer

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Alpha Channel is an essential tool in modern video workflows, enabling transparency and visual effects as required in telepresence and Virtual Reality applications, or modern websites. The Versatile Video Coding (VVC/H.266) standard supports Alpha Channel natively by encoding transparency data as an independent auxiliary layer signaled via SDI and ACI SEI messages (ITU H.274). This presentation details the work to integrate this standard-compliant VVC/H.266 alpha channel support into VVenc and GStreamer for encoding and decoding streams with transparencies. The presentation will cover the following topics: - Introduction to Alpha Channel - Alpha Channel support in video codecs - Alpha Channel decoding support in GStreamer with `GstAlphaDecodeBin` - VVC/H.266 Alpha Channel encoding with VVenc - VVC/H.266 Alpha Channel decoding with GStreamer - Encoding and decoding demo

Creation date: Oct. 23, 2025
Speakers: Andoni Morales Alastruey
License: CC BY-SA 3.0
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