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Prioritize AV1 over H.264 if HEVC is unavailable on Windows

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Some Windows PCs are shipping with HEVC disabled in firmware, even though they support AV1.
This commit is contained in:
Cameron Gutman
2025-11-24 00:06:40 -06:00
parent f5ef201905
commit 62816a6b2a
1 changed files with 17 additions and 2 deletions
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19
app/streaming/session.cpp
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@@ -818,10 +818,25 @@ bool Session::initialize(QQuickWindow* qtWindow)
}
}
#else
// Deprioritize AV1 unless we can't hardware decode HEVC and have HDR enabled.
// Deprioritize AV1 unless we can't hardware decode HEVC, and have HDR enabled
// or we're on Windows.
//
// Normally, we'd assume hardware that can't decode HEVC definitely can't decode
// AV1 either, and we wouldn't even bother probing for AV1 support. However, some
// Windows business systems have HEVC support disabled in firmware from the factory,
// yet they can still decode AV1 in hardware. To avoid falling back to H.264 on
// these systems, we don't deprioritize AV1. This firmware-based HEVC licensing
// behavior seems to be unique to Windows, and Linux on the same system is able
// to decode HEVC in hardware normally using VAAPI.
// https://www.reddit.com/r/GeForceNOW/comments/1omsckt/psa_be_wary_of_purchasing_dell_computers_with/
//
// We want to keep AV1 at the top of the list for HDR with software decoding
// because dav1d is higher performance than FFmpeg's HEVC software decoder.
if (hevcDA == DecoderAvailability::Hardware || !m_Preferences->enableHdr) {
if (hevcDA == DecoderAvailability::Hardware
#ifndef Q_OS_WIN32
|| !m_Preferences->enableHdr
#endif
) {
m_SupportedVideoFormats.deprioritizeByMask(VIDEO_FORMAT_MASK_AV1);
}
#endif