The best adjective describing the AV1 encoder speed I found so far is "glacial".

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I tried to replicate my "480p video at 128kbit/s" experiment [1] with AV1.

The speed was 0.068x realtime (with libaom and default --cpu-used). This means a 15 min video ended up encoding more than 3.5 hours.

While the quality was "watchable" and slightly better than x265 at the same low bitrate, it's yet, maybe unless you are a viral video hosting company.

[1] toot.kottman.xyz/@michal/10273

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