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Firefox will support HEVC decoding on Microsoft Windows

bugzilla.mozilla.org 1853448 - Support HEVC via Windows MFT

NEW (alwu) in Core - Audio/Video: Playback. Last updated 2023-09-25.

We will support HEVC playback via Media Foundation transform (MFT).

HEVC playback will be supported via the Media Foundation Transform (MFT) and WMF decoder module will check if there is any avaliable MFT which can be used for HEVC then reports the support information.

HEVC playback can only be support on (1) users have purchased paid HEVC extension on their computer (SW decoding) (2) HEVC hardware decoding is available on users' computer

For now, I'd like to only enable HEVC for the media engine playback, but keep the HEVC default off on the MFT. Because the media engine is an experimental feature, which is off by default, it's fine to enable HEVC for that.

HEVC playback needs hardware decoding, and it currently only support on Windows. HEVC playback check would be run when the task is in the mda-gpu, which has the ability for hardware decoding. On other platforms, HEVC should not be supported.

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  • This is not a good announcement. Why would they do this?

    • Windows users have been asking for HEVC support for years: https://bugzilla.mozilla.org/show_bug.cgi?id=1332136

      7 years ago, this was the answer:

      Mozilla currently has no plans to support H.265. Our focus will be on AV1.

      The reason we won't support H265 has nothing to do with the difficulty in finding a decoder, or that a decoder source code is released under GPL. Those are trivial matters.

      We will not support h265 video while its patent encumbered.

      BTW, even today vp9 provides better results than H265.

      The conversation changed to, "Firefox could at least do hardware decode support without worrying about patents, right?"

      My guess is they're doing this because Chrome added HEVC hardware decoding support last year.

    • What is the problem with it? It's a video encoding format right?

      • In about 5 years, the last patents for the baseline H.264 (AVC) video codec will expire. This means Firefox will finally be able to support decoding for H.264 (the codec most commonly used with the MP4 container) without Cisco needing to cover the licensing fees for them. DaVinci Resolve will also be able to support decoding/encoding on GNU/Linux. Basically, anyone will be able to implement a H.264 decoder/encoder without needing to pay royalties, which means free software programs like Firefox which don't charge their users will be able to implement it. The codec will no longer be patent-encumbered. See Wikipedia's debate on whether to support H.264 in 2014 for lots of opinions on this: https://commons.wikimedia.org/wiki/Commons:Requests_for_comment/MP4_Video

        However, H.265 (also called HEVC) is the "next-generation" video codec after H.264. The patent pool situation is so confusing and expensive compared to H.264 that Mozilla, Google, Apple, Microsoft, Netflix, and dozens of other companies using video compression technology formed the Alliance for Open Media to develop a royalty-free codec they could use instead of HEVC. As a result, HEVC has seen very little adoption, particularly on the web. Most companies continue to use H.264. Windows 10 asks you to pay $0.99 for HEVC decoding support in the default video player. In fact, Google even announced they were dropping support for H.264 in 2011 because of their "focus on open web principles": https://blog.chromium.org/2011/01/html-video-codec-support-in-chrome.html

        They never went through with it, of course.

        AV1 is finally at a point where there are production-ready encoders and decoders. The iPhone 15 Pro is shipping with AV1 hardware decoding support, so even Apple is on board (though only for the most expensive phone so far). So, we'll see hardware decoding support in more phones in a few years, and hopefully AV1 will see a lot of adoption.

        Adding support for HEVC in browsers feels like a step back because it legitimizes the codec and works against AV1 adoption. Many of these companies have resisted implementing HEVC support (aside from Apple) because it positions AV1 as the only realistic option to shift to from H.264. With HEVC in the picture now, it might be a realistic option in the future. Well, there's VP9 too, but there are some patent disputes over that codec that might make companies sheepish about adopting it. Not that AV1 is free from those disputes either, but they are far more confident about it and Unified Patents is doing great work invalidating Sisvel's AV1 patent claims (and even some HEVC patents here and there).

        My opinion is that the ship has already sailed. Chrome caving in and adding HEVC support last year, albeit only with hardware decoders, was all it took with their 90%+ market share. Firefox's 3% market share isn't going to make a dent, and not doing it risks keeping users who need HEVC support on Chrome. I also don't think hardware decoding support is a big deal right now due to all the older devices without HEVC hardware decoders, but it opens the door to ask for more support down the line. I very much doubt Google is going to do that, though.

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