Workaround: set `media.webrtc.platformencoder` or `media.webrtc.platformencoder.sw_only` to `false` (the latter depends on the former).
Bug 1838491 Comment 3 Edit History
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Workaround: set `media.webrtc.platformencoder` or `media.webrtc.platformencoder.sw_only` to `false` (the latter depends on the former). The [first pref](https://searchfox.org/mozilla-central/rev/9ac4c7d32fa21ddef5cdf281939228ecfedabf64/modules/libpref/init/StaticPrefList.yaml#10910,10915,10919,10924) (which controls the second) is `@IS_EARLY_BETA_OR_EARLIER@`, making this only affect beta and nightly.