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x264 opponents are earlier versions of AV1, namely VP8 and VP9.

x265 should be what is compared against AV1 when discussing quality and encode speeds.

We use x264 for compatibility purposes, if your device is intended to play video, it will decode x264. x265 decoders are in a lot of devices at this point, and AV1 is just now starting to see representation.

x264 is like .jpeg and will probably never die.

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Yeah y'all are preaching to the choir, but AVC is still the default for... Well, everything, including OP.

It will probably eventually be like mp3, where users are still reflexively encoding to it without a good reason.

Unlike mp3s compared to other audio codecs, h264 has the luxury of pretty much ubiquitous support for hardware decoders and encoders against other video codecs, so I believe it will have an even longer life than mp3.

A nitpick: x264 is an encoder implementation, the format itself is called H.264 (and H.265).

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