Libriheavy: a 50,000 hours ASR corpus with punctuation casing and context. Libriheavy is a labeled version of Librilight.
This uploaded version replaces the default Libri-Light audio files with the highest quality available versions
from librivox. In most cases, this consists an upgrade of the source audio from a 64kbps mp3 to a 128kbps mp3.
Audio files are then re-encoded using the Opus 68kbps codec to retain quality and reduce size.
