How to Convert DSD to FLAC Using FFmpeg

This article provides a straightforward, step-by-step guide on how to convert high-resolution DSD (Direct Stream Digital) audio files, such as .dsf and .dff, into the widely compatible FLAC format using the command-line tool FFmpeg. You will learn the exact commands needed to perform the conversion, optimize the output sample rate and bit depth, and batch-process entire folders of music while preserving maximum audio quality.

The Basic Conversion Command

If you have FFmpeg installed on your system, you can perform a basic conversion from DSD (DSF or DFF) to FLAC using a simple command. Open your terminal or command prompt and run:

ffmpeg -i input.dsf output.flac

While this command works, FFmpeg’s default settings may not yield the best audio quality for DSD files. DSD is a 1-bit high-frequency format, whereas FLAC is a PCM (Pulse Code Modulation) format. To get the best sound, you should specify the sample rate and bit depth during the conversion.

Recommended Command for High-Quality Audio

DSD64 is sampled at 2.8224 MHz (which is 64 times the CD rate of 44.1 kHz). When converting DSD to PCM-based FLAC, it is best to use a sample rate that is an exact multiple of 44.1 kHz, such as 88.2 kHz or 176.4 kHz, and a bit depth of 24-bit.

Use the following command to convert your DSD file to a 24-bit / 88.2 kHz FLAC file:

ffmpeg -i input.dsf -c:a flac -sample_fmt s32 -ar 88200 output.flac

Command Breakdown:

• -i input.dsf: Specifies the input DSD file (works for .dsf and .dff files).
• -c:a flac: Selects the FLAC audio encoder.
• -sample_fmt s32: Tells FFmpeg to export the audio using a 32-bit sample format, which the FLAC encoder automatically compresses down to high-quality 24-bit PCM.
• -ar 88200: Sets the audio sample rate to 88,200 Hz (88.2 kHz), preserving the high-frequency detail of the original DSD file.

If you are converting higher-resolution DSD files, such as DSD128 or DSD256, you can increase the sample rate to 176400 (176.4 kHz):

ffmpeg -i input.dsf -c:a flac -sample_fmt s32 -ar 176400 output.flac

Batch Converting Multiple DSD Files

If you have an entire album or folder of DSD files, you can convert all of them at once using a simple command-line loop.

On Windows (Command Prompt):

Navigate to your folder containing the .dsf files and run:

for %i in (*.dsf) do ffmpeg -i "%i" -c:a flac -sample_fmt s32 -ar 88200 "%~ni.flac"

On macOS and Linux (Terminal):

Navigate to your directory and run:

for f in *.dsf; do ffmpeg -i "$f" -c:a flac -sample_fmt s32 -ar 88200 "${f%.*}.flac"; done

(Note: If your files end in .dff instead of .dsf, simply replace *.dsf and .dsf with *.dff and .dff in the scripts above).