AV1 playback on Windows, explained

AV1 is the newest codec in wide use, and the one most likely to leave you with a black screen on an older machine. Here is what it is and how to play it today.

Why AV1 exists

AV1 squeezes the same picture into a noticeably smaller file than HEVC, and it is royalty-free by design. That combination is why streaming services and video sites adopted it quickly, and why more of the files you download now arrive in it.

Why it will not play

Hardware support for AV1 only arrived in recent graphics chips. On anything older there is no decoder in the machine at all, so a player that relies on the system has nothing to fall back on.

Playing it regardless

AIX Player brings its own AV1 decoder, so the file opens whatever your hardware is. On newer Intel, NVIDIA and AMD chips the graphics hardware takes over, which keeps playback light and the fans quiet; on older machines it decodes in software instead.

How to tell whether a file is AV1

You usually cannot tell from the file name, because AV1 lives inside an MKV, MP4 or WebM container like any other video. The details page in AIX Player shows what a file actually contains — the video type, resolution, bitrate and length — which is the quickest way to know what you are dealing with. If a file plays here but failed elsewhere, AV1 is a very likely reason.

Why AV1 files are so much smaller

AV1 spends far more effort analysing each frame than older formats do, which lets it describe the same picture with less data. In practice a film encoded in AV1 can be a third smaller than the H.264 version at the same visible quality. The trade is that all that analysis has to be undone during playback, which is why AV1 is demanding to play on a machine with no hardware support for it — and why the graphics card matters more here than with older files.

Casting an AV1 file to your television

Televisions have been slower to adopt AV1 than PCs, so many sets cannot display it directly even when they handle 4K perfectly well. AIX Player checks what your television accepts before sending anything and converts the picture as it streams where it has to, using your graphics card. The film starts within seconds rather than after a long conversion, and your original file is left exactly as it was.