Improved logging

Some information are now logged under INFO and DEBUG levels. The logging level can be configured like this:

import logging

logging.basicConfig()
logging.getLogger("faster_whisper").setLevel(logging.DEBUG)

More control over model downloads

New arguments were added to the WhisperModel constructor to better control how the models are downloaded:

• download_root to specify where the model should be downloaded.
• local_files_only to avoid downloading the model and directly return the path to the cached model, it it exists.

Other changes

• Improve the default VAD behavior to prevent some words from being assigned to the incorrect speech chunk in the original audio
• Fix incorrect application of option condition_on_previous_text=False (note that the bug still exists in openai/whisper v20230314)
• Fix segment timestamps that are sometimes inconsistent with the words timestamps after VAD
• Extend the Segment structure with additional properties to match openai/whisper
• Rename AudioInfo to TranscriptionInfo and add a new property options to summarize the transcription options that were used