Understanding BWF, metadata, WAV audio masters and professional archival audio workflows.
What is BWF?
Broadcast Wave Format, commonly abbreviated BWF, is an extension of the WAV format designed for professional audio workflows and capable of carrying metadata within the file.
Why is BWF useful for archives?
IASA recommends BWF .wav files for archival purposes, while noting that embedded metadata should be used thoughtfully alongside external collection management systems.
What metadata can BWF contain?
BWF can carry technical and descriptive information in its headers. The exact metadata implementation depends on the workflow and software.
BWF versus ordinary WAV
A BWF file is still a WAV-family audio file, but adds fields intended to support professional and broadcast workflows. Not every WAV file is therefore a BWF.
How is BWF created?
An analogue recording can be captured through a suitable analogue-to-digital chain and written directly to BWF at the agreed sampling rate and bit depth. Digital originals should generally be retained at their native characteristics.
Why does the capture chain matter?
IASA states that the reproduction equipment, signal path and target format should equal or exceed the requirements of the digital audio being created. The file format cannot compensate for poor playback or conversion.
Frequently Asked Questions
What is BWF used for?
BWF is widely used for professional and archival audio because it combines PCM audio with metadata capabilities.
Is BWF the same as WAV?
BWF is based on WAV and uses the .wav extension, but includes additional fields for professional metadata.
Can BWF be used for preservation?
Yes. IASA recommends BWF WAV for archival purposes, with appropriate consideration of metadata and storage.
Further Reading
Oxford Duplication Centre — Practical Expertise
Audio preservation depends on the original carrier, compatible playback equipment, a controlled signal path and careful quality assurance. The preservation master should retain the best practical representation of the source, with access files created separately.
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