True Gapless Conversion of Audio Files

Tutorials

For audio conversion of some album kinds (operas, symphonies, live concerts, musicals, shows, etc.) need to provide seamless (gapless) transients between neighbour converted tracks.

True Gapless Conversion (TGC) - seamless album conversion - allow to avoid artifacts at borders of neighbor converted tracks.

General description

There are albums like operas, live concerts, etc., where no pauses between neighbor tracks. Also there may be non-zero levels at track borders of the albums.

Some ISO (1-bit audio) has level bias (DC-bias, direct current bias) thru full album: at begin and end of tracks DC-bias (non-zero level) is present. It can be listened as click.

Level bias (DC-bias) thru full album

In conversion may be applied audio processings:

1. Resampling (sample rate altering)
2. Altering 1-bit audio stuff (DSF, DFF, ISO).

In conversion without the processing, there are not artifacts at output-track borders.

But, if each album track (file) is processed separately, non-zero level at input-file border generate artifact at output-file border. Because the processing is re-initialized for each track.

For seamless audio processing of album, all its audio files may be processed as continuous audio stream without re-initializing of processing for each track (file).

Audiophile Inventory's trueG seamless conversion algorithm allow seamlessly process neighbor tracks of album.

True gapless mode switched in AuI ConverteR's main window > Parameters tab (upper left):

turn ON (checked state) / OFF (unchecked state).

Management of True Gapless Conversion mode

Here merged converted neighbor album tracks are shown

If True Gapless Conversion turn OFF, we see noise splash on border of merged resampled converted tracks.

If True Gapless Conversion turn ON, we see seamless transient between resampled converted tracks. Like input source files.

AuI ConverteR 48x44 provide True Gapless Conversion for the following conditions are complied with:

1. All input (source) tracks (files) must have same sample rate and bit depth.
2. Input tracks must be sorted in album order.

Warnings

1. True gapless mode don't use multi-CPU capability. Because, files (album tracks) should be processed sequentially. To convert next audio file need converter state at coversion end of previous one.
2. Audio player (software or hardware), that playback processed files, should support gapless (seamless, without re-initialization on each file) playback. All files should be played back as continuous stream.

What AuI ConverteR's editions support the True Gapless Conversion

AuI ConverteR FREE allow test True Gapless Conversion with 2 second silence at middle of converted files, including ISO 1-bit-audio files.

True Gapless Conversion supported in maximal PROduce-RD and configurable Modula-R editions of AuI ConverteR.

Read about sound quality

1. How to Improve Sound Quality >
2. What is optimization audio for DAC >

Read also

How Convert ISO to DSF, WAV, etc. without Clicks (Mac OS X and Windows) >