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How to convert 64-bit WAV (RF64) and BWF [Mac Windows]


WAV 64-bit (or RF64) is special WAV compatible format for supporting big (more 4 GBytes) audio files.  It's actual for super high resolutions 352, 384 and higher kHz. The RF64-audio file have either *.wav or *.rf64 extension.
RF64 do not meant 64-bit bit depth. RF64 define file size. Big WAV file with 64-bit bit depth may be stored in RF64 format.


How to convert to WAV RF64 (64 bit)

  1. Launch AuI ConverteR 48x44. See the converter configurations
  2. Open input file.
  3. Select target format WAV, sample rate and bit depth.
  4. Push Start button.
  5. This format is supported automatically and transparently for user. Read details below >


Audiophile music file converter with WAV RF64 supportWAV RF64 64 bit audio file converter

    for playback music on:
        digital audio player (DAP),
        media server/streamer,
        car stereo.

    Resolution up to 64 bit /768 kHz, D1024
    Multichannel and stereo

    Clickless technologies
    Auto and manual artwork assigning to target files
    Easy-to-use software


How RF64 works

Audio converter AuI ConverteR 48x44 support WAV 64-bit according RF64 specification.

  1. Output (converted) WAV file is created
    In its header, dummy block ("JUNK" chunk by WAV specification) is added. It's fully compatible with usual WAV. Most players must ignore the block.
  2. After conversion start, audio data are written to the WAV file.
  3. After end of conversion and writing, the converter check real size of output file.
    • If its size is more 4 GBytes, "JUNK" block is replaced to "ds64" block with RF64 parameters (64-bit file length, etc.).
      Also name of first WAV block is replaced from "RIFF" to "RF64" and its size is set to maximal value (0xFFFFFFFF in hex format).
      Size of block "data" (audio data) is replaced to 0xFFFFFFFF.
      Now it is real WAV RF64 file.
    • If size of the file less 4 GB, audio file stay ordinary WAV.

How ordinary WAV converted to WAV 64-bit (RF64)

How ordinary WAV converted to RF64 (WAV 64-bit)


RF64 settings

  1. If in AuI converteR's Settings > Metadata  > "Force 32-bit wav" switch is checked, block JUNK is not created and next steps don't work.
    It's need for compability with some players and software.
  2. For some pro audio applications, it is need to reserve place for RF64 markers (time points of audio data). AuI reserve place in begin of file for the markers.
    Audio players usually don't use the markers. To avoid the marker place reserving, in Settings > Metadata > uncheck "No markers RF64" switch.

RF64 settings

RF64 or wav 64-bit settings


To assign BWF field, go to Settings > BWF:

BWF settings

Broadcast Wave Format settings


RF64 and BWF capable minimal configurations

  1. Maximal configuration PROduce-RD include RF64 and BWF functionality.
  2. Configurable AuI ConverteR Modula-R can support RF64 and BWF:

Check minimal configuration price, that allow to
WAV(RF64, BWF)/FLAC/AIFF/mp3/... (
up to 192 kHz/24 bit*) to WAV(RF64, BWF)/FLAC/AIFF/mp3/... (up to 192 kHz/24 bit*):

[ Mac OS X ]      [ Windows ]


Check minimal configuration price, that allow to
WAV(RF64, BWF)/FLAC/AIFF/mp3/... (
up to 192 kHz/64 bit*) to WAV(RF64, BWF)/FLAC/AIFF/mp3/... (up to 192 kHz/64 bit*):

[ Mac OS X ]      [ Windows ]


Check minimal configuration price, that allow to
WAV(RF64, BWF)/FLAC/AIFF/mp3/... (
up to 384 kHz/24 bit*) to WAV(RF64, BWF)/FLAC/AIFF/mp3/... (up to 384 kHz/24 bit*):

[ Mac OS X ]      [ Windows ]


See more configurations >

Configure AuI ConverteR Modula-R >


* - depend on format. As example, mp3 support 16 bit and 44.1/48 kHz only.
WAV can support up to 64 bit / 768 kHz, when AuI ConverteR configuration support it.


How work 64-bit WAV (RF64) support


Read more about WAV




1. EBU Tech 3306 - MBWF / RF64: An Extended File Format for Audio


Read other articles about audio issues
What is Hi-Res Audio? | Where are Free Downloads?
Audio Converter List [2018] | Read Comparison
Free Audio Player Software Pieces for Audiophiles
R2R Ladder DAC vs Sigma-Delta DAC vs DSD DAC [Infographic Inside]
DSD High-Resolution Music Downloads [Check Free Files]
PCM Audio [Quick Explanation. Myth Reasons]

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