  Self-supervision has recently shown great promise for learning visual and
auditory speech representations from unlabelled data. In this work, we propose
BRAVEn, an extension to the recent RAVEn method, which learns speech
representations entirely from raw audio-visual data. Our modifications to RAVEn
enable BRAVEn to achieve state-of-the-art results among self-supervised methods
in various settings. Moreover, we observe favourable scaling behaviour by
increasing the amount of unlabelled data well beyond other self-supervised
works. In particular, we achieve 20.0% / 1.7% word error rate for VSR / ASR on
the LRS3 test set, with only 30 hours of labelled data and no external ASR
models. Our results suggest that readily available unlabelled audio-visual data
can largely replace costly transcribed data.
