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How to Convert ISO to DSF WAV FLAC AIFF without Clicks. User Manual

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There are some tricks for achieving better convertion result of high resolution 1-bit audio disk image ISO to DSF, WAV, FLAC, AIFF, ... files. Here described instructions to convert ISO without clicks, that known to author, via AuI ConverteR 48x44. 100% ridding of pops is not guaranteed. There are many click reasons. Each case demands individual approach.

Conversion ISO to DSF FLAC WAV AIFF. User manual

 

1. Conversion ISO to FLAC, WAV, AIFF and other PCM formats is supported by AuI ConverteR Audiophil-E, PROduce-R, PROduce-RD and configurable Modula-R.

2. Conversion ISO to DSF is supported by maximal PROduce-RD and configurable Modula-R.

 

 

Read below about click reasons and how to fix it

 

 

Audio converter DFF to DSF Mac OS X, Windows

AuI ConverteR 48x44 download free



Download HD audio converter AuI ConverteR 48x44 FREE for high resolution music
WAV, FLAC, AIFF, ALAC, ISO, DFF, DSF, WMA, mp3,...

WARNING: Input DSF, DFF, ISO supported in Audiophil-E, PROduce-R and configurable Modula-R
Output DSF supported in maximal PROduce-RD and configurable Modula-R

 

Introduction

ISO audio file is file-container, that included one or several mix(mixes) of one album.

Mix is variant of album tracks (songs). As example, file-container may contains stereo and multichannel variants (mixes) of one album.

If your protable digital audio player or mobile phone playback at stereo headphones, downmix multichannel songs to stereo allow to place more music in limited hard disk space.

As example, you extract 2.0-mix from file-container (with 5.1 and 2.0) to DSF, WAV, FLAC, AIFF и пр. Stereo (2 channels) file demands lower disk space, than 5.1 (6 channels) variant.

If your system support multuchannel records, you can extract 5.1 mix to keep free space at hard disk in music server, streamer or dedicated to playback multimedia fast network attached storage (NAS).

As rule, SACD ISO images contains stereo mix only or both stero and multichannel variants. Pure multichanned file-containers are more rare.

Backup of original (non-converted) audio files is strongly recommended. Because, converted files can be lost, new playback equipment with other audio resolution can be purchased.
Backup storage may be slow and use compression to save budget USD per Gbyte.

 

 

Content

  1. Reasons of ISO conversion clicks
    1. Extracting ISO to DSF without last partitial block due some extraction software bug
      1. Why extract ISO to DSF (not DFF) is recommended?
      2. How to fix lost-audio-data-block-click issue during ISO to DSF extraction
    2. DC bias in some tracks
    3. Clicks in silence (pauses) between tracks
    4. How to eliminate clicks in album playback
    5. How to eliminate clicks in playback of separate tracks
    6. Audio player matter of playback clicks
  2. Ways of ISO conversion
    1. Bit perfect conversion
    2. Seamless resampling
    3. DC biased audio content conversion (Smooth DC mode)
  3. How extract stereo and multichannel ISO tracks
  4. How to remove pauses between tracks extracted from ISO
  5. Tutorials
    1. How to Convert ISO to FLAC under Mac and Windows
    2. How to Convert ISO to DSF under Mac and Windows
    3. How to Convert with Downmix 5.1 to stereo
    4. How to Convert ISO to FLAC (video)
    5. How to Convert ISO to DSF (video)
  6. Troubles
    1. What is mean log message "error: input file is compressed"
    2. What is mean log message "app e: libsacdread: Can't open X:/iso/Sample ?.iso for reading"
    3. What is mean log message "Error ISO conversion in log file: libsacdread: Not a ScarletBook disc! libsacdread: Can't read Master TOC"

 



Download HD audio converter AuI ConverteR 48x44 FREE for high resolution music
WAV, FLAC, AIFF, ALAC, ISO, DFF, DSF, WMA, mp3,...

WARNING: Input DSF, DFF, ISO supported in Audiophil-E, PROduce-R and configurable Modula-R
Output DSF supported in maximal PROduce-RD and configurable Modula-R


1. Reasons of ISO conversion clicks

  1. Extracting ISO to DSF without last partitial block due some extraction software bug
  2. DC bias in some album songs
  3. Playback software issues

 

1.1. Extracting ISO to DSF without last partitial block due some extraction software bug

It is well known issue of sacd_extract software for ISO to DSF conversion.

Audio data in DSF sound file divided to blocks. And last block can be partially filled. Rest its space may be filled by zeroes. If last block is lost, non-lero level may be present at the end of song. It can cause click at the song end.

Some musical discs contains uninterrupted stuff (like opera or live concert). Lost during extraction last block give burst of the ininterrupted original stuff. It may be listened as light but unpleasant pop.

sacd_extract software extract musical content without the bursts / clicks for conversion ISO to DFF.

The software's developers inform that for v. 0.3.8 the issue is fixed: "fixed a bug where a DSF export truncated sample data".

Extracting to WAV, FLAC, AIFF, ALAC and other PCM formats provided thru DFF/DSF too.  Therefore there may be same click reasons.

 

1.1.1. Why extract ISO to DSF (not DFF) is recommended?

From end user's point of view no difference between DSF and DFF as music data storage.

DSF file can contains metadata (album and song name, performer, album arts) in standard implementation. As rule, DSF metadata must be supported by audio playback software / hardware.

DFF file can contains metadata in non standard chunk (block). Same way used in WAV and AIFF for support id3 type of metadata. These metadata are stored into universal data block (chunk). Some software is able to read the block content. Other software ignore the block.

When sacd_extract convert ISO to DSF, it place available metadata to output DSF.

But some software versions extract DSFs with pops due last audio data block issue.

 

1.1.2. How to fix lost-audio-data-block-click issue during ISO to DSF extraction

AuI ConverteR 48x44 solve the lost-audio-data-block-pop issue via next conversion workflow:

ISO -> DFF-file + CUE-file with metadata -> DSF with metadata from CUE-file

Solving of  the lost-audio-data-block-pop issue

SACD ISO to DSF workflow

All it work transparently for user. Only need push Start button and wait for ready DSF.

For extracting 1-bit audio ISO without resampling, bit perfect conversion ISO to DSF is used.

 

 




Download HD audio converter AuI ConverteR 48x44 FREE for high resolution music
WAV, FLAC, AIFF, ALAC, ISO, DFF, DSF, WMA, mp3,...

WARNING: Input DSF, DFF, ISO supported in Audiophil-E, PROduce-R and configurable Modula-R
Output DSF supported in maximal PROduce-RD and configurable Modula-R

 

 


Read articles

 

 

1.2. DC bias in some tracks as click reason

Some songs have DC bias. This bias may change into one album.

On the picture we can see bias rise gradually in right channel of first album song:

DC bias in right channel of first album song

DC bias ISO's track

In next song the bias remains constant. In the last-album-song end, bias is decreased to zero gradually.

 

Clicks during playback of separate tracks

If such album is played back as continuous stream (without re-initialization playback software and hardware in begin of the album song), track-border clicks won't be there.

Separate playback of the album song #1 can cause pop at its end. Separate playback of the last album song can cause click at its begin.

Rest of songs can cause pops at its begin and end.

In picture showed DC bias of one of the songs in the album middle. The bias can cause clicks at begin and end of the file in playback.

DC bias of one of the tracks in the album middle

DC bias in non-first track

 

1.3. Clicks in silence (pauses) between tracks

Pauses between album songs may contains pops.

To remove the pauses:

  1. In AuI ConverteR's main window push Settings button.
  2. In Settings window select CD ripper/ISO tab.
  3. Set checked Skip pause for first ISO track switch.
  4. Set checked Skip pauses for all tracks switch.
  5. In Settings window push OK button.

 

1.4. How to eliminate clicks in album playback

Сoncert may be recorded as single sound file and divided to several parts (files) to distribute on SACD, DVD, CD-audio.

Such album must played back as single stream. Such audio player functionality called as gapless playback.

To extract ISO without processing (resampling, altering volume, etc.), bit perfect conversion ISO to DSF is recommended. Extracted to DSF musical stuff is binary identical to audio data of original album file.

To extract ISO with processing or to PCM (WAV, FLAC, AIFF,...), seamless conversion is recommended. Therefore album songs (separate files) integrity, as continuous stream, is provided after processing.

 

1.5. How to eliminate clicks in playback of separate tracks

To playback separate album song without border pops, Smooth DC processing may be recommended. However, SmoothDC is not recommended for continous albums (live concerts, operas, etc.). Because SmoothDC can cause short pauses on song borders.

More details in Audio player matter of playback clicks part.

 

1.6. Audio player matter of playback clicks

Files, that extracted from ISO in bit-perfect mode, played back on player with gapless playback ability, must not cause pops.

If audio software or hardware player re-initialize DAC for each track, DC bias may be listened as click. To avoid such pops Smooth DC processing is recommended.

DAC condition changing may cause clicks.

 

 



Download HD audio converter AuI ConverteR 48x44 FREE for high resolution music
WAV, FLAC, AIFF, ALAC, ISO, DFF, DSF, WMA, mp3,...

WARNING: Input DSF, DFF, ISO supported in Audiophil-E, PROduce-R and configurable Modula-R
Output DSF supported in maximal PROduce-RD and configurable Modula-R

 


2. Ways of ISO conversion

  • Bit perfect conversion
    binary audio content of extracted files is fully identical to ISO-container audio data
     
  • Seamless resampling
    Musical content may be accurate adjusted offline to "the best sounding" sample rate of your DAC to avoid "on fly" upsampling in audio player and/or hardware. Seamless resamplig allow to resample album with continuous musical content (opera, live concert, etc.) without artefacts at song borders.
     
  • DC biased audio content conversion
    Some albums can contains DC bias in all songs. The bias can cause pops at song borders.   

 

2.1. Bit perfect conversion

Exact ISO-binary-audio-content copying provided via bit perfect conversion. It is possible identical input and output sample rates. There are ISOs in 2.8 MHz (D64) only.

If you convert ISO to DSF in bit perfect mode, binary musical content of album in file-container will copied to DSF files without changes.

Gapless and clickless playback is provided by audio player (software or hardware) that capable to gapless playback only.

Bit-perfect conversion supported by maximal PROduce-RD and configurable Modula-R.

Bit perfect conversion "Modula-R ISO extract (core)" module provide without other ones.

 

Manage Bit Perfect Conversion mode

1. In AuI ConverteR 48x44's main window push Settings button.

Settings for bit perfect conversion

2. Into Setting window select General tab.

3. Check Don't make DSP... and uncheck Smooth DC switches.

4. Push OK button in Settings window.

 

 

 

2.2. Seamless resampling (True Gapless Conversion)

This mode allow convert album audio files without transient processes at song borders.

Seamless (gapless) processing is digital signal processing without re-initializing for each song (sound file).

The border of merged neighbor album tracks

True Gapless Conversion

At the picture border of merged neighbor album tracks is shown.

At picture's upper part, tracks, converted without True gapless mode, are shown. There is noise splash (light vertical line) by transient process at border of songs is shown.

At picture's bottom part, True Gapless Mode turned ON. There is no noise splash between neighbor songs.

Transient process at song border can be almost invisible at oscillogram, but listened as light artefact.

Gapless playback is provided by gapless capable audio player software and hardware only.

True Gapless conversion supported by maximal AuI ConverteR PROduce-RD and configurable Modula-R.

 

True Gapless Conversion mode management

1. In AuI ConverteR 48x44's main window select Parameters tab.

True Gapless Mode management

2. True Gapless Mode turned ON (checked switch) / OFF (unchecked switch).

3. In AuI ConverteR 48x44's main window push Settings button.

Don't make DSP

4. Into Setting window select General tab.

5. Uncheck Don't make DSP... and Smooth DC switches.

6. Push OK button in Settings window.

 

True Gapless conversion supported by maximal AuI ConverteR PROduce-RD and configurable Modula-R.

True Gapless conversion mode work slower than usual parallel (multi-CPU) mode. Because seamless transient between album files is provided in sequiential processing.

 

 

 

2.3. DC biased audio content conversion (SmoothDC)

SmoothDC processing reduce DC-bias clicks at begin and end of song (sound file).

If pop located out of SmoothDC's action time, the pop may be fixed via editing of converted audio file.

SmoothDC provided as additional gain control:

a) smooth and fast gain increasing in song begin,

b) smooth and fast gain  decreasing in track end.

It allow to reduce clicks, that located in time area of gain changing. However, the processing is not recommended for albums like operas, live concerts and same ones. Because it can cause short pauses between songs.

Smoth DC processing may be recommended, if album tracks will played back separatelly.

 

Smooth DC at begin of the first album track only

If remove pause before the first track, at the first song begin non-zero level may appear. It can cause pop at begin of the first track. Even in True Gapless conversion. True gapless mode need for resampling of operas, live concerts and other continuous albums. In this case SmoothDC processing is not recommended for borders between songs. But SmoothDC may be applied at begin of the first song only.

 

Smooth DC processing management

Smooth DC at begin and end every track

1. In AuI ConverteR 48x44's main window push Settings button.

Settings for Smooth DC mode

2. Into Setting window select General tab.

3. Unheck Don't make DSP... and check Smooth DC switches.

4. Push OK button in Settings window.

 

Smooth DC at the begin of first album track only

1. At AuI ConverteR 48x44's main window push Settings button.

Settings for Smooth DC mode for first track

2. At the Setting window select General tab.

3. Unheck Don't make DSP... and check Smooth DC begin first track switches.

4. At the Settings window push OK button.

 

 


3. How extract stereo and multichannel ISO tracks

AuI ConverteR 48x44 can extract from file-container ISO either stereo or multichannel mix by user choise:

 

Stereo / multichannel extraction mode management

1. At AuI ConverteR 48x44's main window push Settings button.

2. At the Setting window select CD ripper/ISO tab.

Stereo and multichannel ISO extraction

3. Select stereo or multichannel mix extraction mode from file-container:

    3.1. To extract multichannel mix uncheck Force read stereo track... switch.

    3.2. To extract stereo mix check Force read stereo track... switch.

4. At the Settings window push OK button.

 

 

Since version 6.0.3 appear ability of extracting from the file-container only selected kind of mixes: stereo or multichannel. If there are no selected kind of mixes, extracted nothing.

At Setting window select CD ripper/ISO tab look to Selected channel number only switch.

1. Stereo only: Selected channel number only switch checked (selected only), Force read stereo track... checked (stereo extraction):

1.1. If ISO file-container contains 2.0 mix only or 2.0 and 5.1, then stereo (2.0) mix is extracted.

1.2. If the file-container contains 5.1 mix only, extracted nothing.

 

2. Multichannel only: Selected channel number only switch checked (selected only), Force read stereo track... unchecked (multichannel extraction):

2.1. If the file-container contains 5.1 mix only or 2.0 and 5.1, then multichannel (5.1) mix is extracted.

2.2. If the file-container contains 2.0 mix only, extracted nothing.

 

3. Stereo or any available: Selected channel number only switch unchecked (any available), Force read stereo track... checked (stereo extraction):

3.1. If the file-container contains 2.0 only or 2.0 and 5.1, then stereo mix (2.0) is extracted.

3.2. If the file-container contains 5.1 only, then multichannel mix (5.1) is extracted.

 

4. Multichannel or any available: Selected channel number only switch unchecked (any available), Force read stereo track... unchecked (multichannel extraction):

4.1. If the file-container contains 5.1 only or 2.0 and 5.1, then multichannel (5.1) mix is extracted.

4.2. If the file-container contains 2.0 only,  stereo (2.0) mix is extracted.

 

 


4. How to remove pauses between tracks extracted from ISO

AuI ConverteR 48x44 can skip pause before first song and pauses between songs when extract audio files from file-container ISO [1 bit audio] (supported by maximal PROduce-RD and configurable Modula-R)

 

Manage skipping pause before 1-st album song

1. At AuI ConverteR 48x44's main window push Settings button.

2. Into Setting window select CD ripper/ISO tab.

How remove 2 second pause begin first ISO track

3. To skip pause before first song check Skip pause for first ISO track switch.

4. To skip pauses between all tracks check Skip pause for all track switch.

5. Skipped pause length assigned at Pause, ms input field in milliseconds.

6. At Settings window push OK button.

 


6. Troubleshooting

6.1. What is mean log message "error: input file is compressed"

It is issue of AuI ConverteR 48x44's obsolete versions.

1. Download and re-install last version.

2. Reset input decoders.

3. Restart AuI ConverteR.

 


6.2. What is mean log message "app e: libsacdread: Can't open X:/iso/Sample ?.iso for reading"

It is issue of AuI ConverteR 48x44's obsolete versions. If in *.iso file path and/or name present non English symbols, rename this ISO file and/or its path so, that it contain English symbols only.

 


6.3. What is mean log message "Error ISO conversion in log file: libsacdread: Not a ScarletBook disc! libsacdread: Can't read Master TOC"

The message displayed when DVD ISO file-image is converted on AuI ConverteR. Mount the file-image in virtual DVD drive. At DVD image AUDIO_TS and/or VIDEO_TS folders are placed.


If the file-image is SACD ISO, its structure may be damaged. In this case:

1. Install virtual DVD-RW drive software TotalMounter.
2. Install image burnig software ImgBurn.
3. In TotalMounter mount new DVD-RW drive.
4. In ImgBurn write the ISO file-image (that have the displayed error) to the new virtual drive (keep verify on).
5. Open new created ISO image in AuI ConverteR and convert it.

 

 


Read more

Extract ISO to DSF PCM. Clicks Issues >

Comparison DSD encoders and decoders >

Comparison DSD converters >

SACD ISO ripping issues >



Download HD audio converter AuI ConverteR 48x44 FREE for high resolution music
WAV, FLAC, AIFF, ALAC, ISO, DFF, DSF, WMA, mp3,...

WARNING: Input DSF, DFF, ISO supported in Audiophil-E, PROduce-R and configurable Modula-R
Output DSF supported in maximal PROduce-RD and configurable Modula-R


 

 

Read more

What is DSF >

How to work DSD converter >

DSF specification

ID3 metadata standard

 

 


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