`mNumTemporalLayers` should probably map to `ts_number_layers` under `ts-parameters` in libvpx options: https://ffmpeg.org/ffmpeg-codecs.html#Options-33
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[`ScalabilityMode`](https://searchfox.org/mozilla-central/rev/762f24e00a9548d80ebba1b985c871ba6d9b829d/dom/media/platforms/PlatformEncoderModule.h#153) in `MediaDataEncoder` should be mapped to temporal layers settings in libvpx encoder via `ts-parameters`: https://ffmpeg.org/ffmpeg-codecs.html#Options-33