Previewing H.264/AVC support for ORTC

[Windows]

Today we’re excited to announce preliminary support for H.264/AVC support in the real-time communications (RTC) stack in Microsoft Edge, as initially promised in our April

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. You can preview this feature in

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starting with

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by navigating to about:flags and checking “Enable experimental H.264/AVC support.” This change helps enable interoperable video communications solutions across browsers for basic 1:1 calling scenarios.

This preview release adds the following for H.264/AVC support in our RTC stack:

• Support for packetization-mode 1, per
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• Support for Constrained Baseline Profile with levels up to 4.2 (i.e. with profile-level-id=42c02a)
• Support for the
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  (abs-send-time)
• Support for Picture Loss Indication (PLI), per
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H.264/AVC support is currently available through the ORTC API in Microsoft Edge. In addition, we’re actively working with the community to enable these features via the

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as well.

These features lay the foundation for video interoperability within the Edge RTP stack, and we plan to extend this in future release by supporting additional feedback messages (e.g. Generic NACK) as well as congestion control and robustness mechanisms (e.g. RTX).

We will continue developing our RTC implementation beyond this summer’s Anniversary Update, including planned support for the WebRTC 1.0 API, and will share updates and preview builds as this work progresses.

– Shijun Sun, Principal Program Manager, Microsoft Edge
– Bernard Aboba, Principal Architect, Skype

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