Lossy or lossless: which audio format should I keep my library in?

For long-term archiving choose FLAC (lossless, ~50% the size of WAV). For everyday listening on phones and streaming use MP3 320 kbps or Opus 192 kbps (transparent quality, no audible difference at normal volumes). Avoid converting lossy → lossy → lossy: every step compounds artifacts.

Guide · dts → flac

DTS Audio Files: Digital Theater Systems Surround Sound Format Guide

✓ ISO/IEC Verified · 5 min · Updated October 19, 2026 · By Pablo Cirre

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DTS Audio Files: Digital Theater Systems Surround Sound

DTS (Digital Theater Systems) is the other major multi-channel surround sound codec alongside Dolby Digital (AC3). Founded in 1991 and first used in the theatrical release of Jurassic Park (1993), DTS has been a fixture in home theater since DVD introduced DTS support in 1997. Unlike AC3 which operates at a maximum of 640 kbps for 5.1, DTS uses higher bitrates — typically 1,509 kbps for DVD DTS — which its proponents argue produces superior audio quality, though the audible difference is debated among audiophiles. DTS files use the .dts extension for standalone files, though DTS audio is typically found embedded in DVD, Blu-ray, or MKV containers.

DTS Codec Family

The DTS brand encompasses several distinct codec variants:

DTS Digital Surround (Core DTS)

The original format. Supports 5.1 channels with bitrates from 754.5 kbps to 1,509.75 kbps on DVD. The high bitrate was DTS's primary marketing differentiator against Dolby Digital's 448 kbps DVD standard.

Key spec: 24-bit audio, 48 kHz, up to 5.1 channels, up to 1,509 kbps.

DTS-ES (Extended Surround)

Adds a discrete or matrix rear center channel to create 6.1 surround:

DTS-ES Matrix — rear center derived from matrix encoding of the two surround channels
DTS-ES Discrete — fully discrete rear center channel

Supported on compatible DVD and Blu-ray releases. Rarely used in modern content.

DTS-HD High Resolution

Blu-ray extension. Extends core DTS with additional audio data for higher quality. Losslessly transparent at sufficient bitrate. Maximum 7.1 channels, up to 24-bit/96 kHz.

DTS-HD Master Audio

Lossless codec for Blu-ray. Bit-for-bit identical to the studio master. DTS-HD MA streams are losslessly compressed at up to ~24.5 Mbps, with a "core" DTS track embedded for backward compatibility with devices lacking lossless decoding capability.

DTS:X (Object-Based Audio)

DTS's answer to Dolby Atmos. Object-based audio that places sounds in 3D space rather than fixed channels. Supported on compatible AV receivers and projectors. DTS:X content is encoded as a DTS-HD MA core with an extension layer.

DTS Express (LBR — Low Bit Rate)

Designed for secondary audio tracks (commentary, descriptive audio). Operates at 32–256 kbps, optimized for speech.

DTS Core Technical Details

DTS uses Subband Coding rather than the transform coding (MDCT) used by AC3/MP3/AAC. It divides the audio spectrum into subbands and quantizes each subband with adaptive bit allocation based on perceptual masking.

Frame structure: DTS uses 512 or 2,048 sample blocks at 48 kHz. Each frame contains a sync word (0x7FFE8001 for 16-bit little-endian, various for 14-bit and big-endian variants).

Sync words: DTS has notoriously complex sync word handling. 14-bit packed DTS (used on some CDs and LaserDiscs) uses 0xFF1F00E8F872 as its sync pattern. This complexity can cause issues with DTS detection and S/PDIF passthrough timing.

Playing DTS Files

VLC: Full DTS playback support including DTS-HD and DTS:X. Can decode to stereo on stereo systems or pass through to an AV receiver via HDMI/S/PDIF.

Kodi: Native DTS support with audio passthrough to AV receivers.

AV Receivers: Connect via HDMI (ARC/eARC) or optical S/PDIF for hardware DTS decoding. Note that optical S/PDIF is limited to 5.1 DTS Core (not lossless DTS-HD MA) due to bandwidth constraints.

macOS: QuickTime does not support DTS natively. Use VLC or IINA.

iOS/Android: VLC for iOS and Android handles DTS files.

Converting DTS Files

DTS to AAC / MP3

DTS is a lossless (DTS-HD MA) or high-bitrate lossy (Core DTS) format, so converting to AAC/MP3 loses some quality but produces a universally compatible output:

# DTS to AAC (stereo — downmixed from 5.1)
ffmpeg -i input.dts -c:a aac -b:a 256k output.m4a

# DTS to AAC (stereo, high quality)
ffmpeg -i input.dts -c:a aac -b:a 320k -ac 2 output.aac

# DTS to MP3
ffmpeg -i input.dts -c:a libmp3lame -q:a 2 output.mp3

DTS to AC3 (Dolby Digital)

Useful when you need 5.1 audio in a container that AC3 players support better:

# Preserve 5.1 channels
ffmpeg -i input.dts -c:a ac3 -b:a 448k output.ac3

# Or embed in MKV
ffmpeg -i video.mkv -i audio.dts -map 0:v -map 1:a -c:v copy -c:a ac3 -b:a 448k output.mkv

DTS to FLAC (lossless PCM)

Best for archival when source is DTS-HD MA:

ffmpeg -i input.dts -c:a flac output.flac

Extracting DTS from MKV/MP4

# List streams first
ffprobe input.mkv

# Extract DTS audio track (assuming stream 0:a:1 is DTS)
ffmpeg -i input.mkv -map 0:a:1 -c:a copy output.dts

DTS on S/PDIF vs. HDMI

Optical S/PDIF (TOSLINK): Limited to 48 kHz, 24-bit, 5.1 channels at 1.5 Mbps. Supports DTS Core (up to 1,509 kbps) but NOT DTS-HD MA or DTS:X (too high bitrate). To get DTS-HD MA, you must use HDMI.

HDMI: Supports full DTS-HD MA, DTS:X, and all DTS variants. eARC (Enhanced Audio Return Channel) supports high-bandwidth lossless formats that regular ARC does not.

DTS vs. AC3 (Dolby Digital): The Debate

The DTS vs. Dolby Digital debate has occupied audiophile forums for decades:

In favor of DTS:

Higher typical bitrate on DVD (1,509 kbps vs. 448 kbps for AC3) — less compression
Subband coding is arguably better suited for transients and percussion
DTS-HD MA is true lossless; Dolby's lossless codec is Dolby TrueHD

In favor of AC3:

Mandatory on DVD (DTS is optional — many discs have only AC3)
Dolby TrueHD is equally lossless on Blu-ray
More efficient at equivalent bitrate according to many double-blind tests
EC-3 (Dolby Digital Plus) supports Atmos natively; DTS:X requires DTS-HD MA core

Practical conclusion: At Blu-ray bitrates (both lossless), there is no audible difference. On DVD, DTS's bitrate advantage is real but the audible improvement is small and depends heavily on content. Both are excellent surround codecs.

DTS in Streaming and Modern Content

Streaming services primarily use Dolby Digital (AC3), Dolby Digital Plus (EC-3), and Dolby Atmos. DTS is less common on streaming platforms:

Netflix: Primarily Dolby Atmos / EC-3
Amazon Prime: Dolby Atmos / AC3, some DTS
Apple TV+: Dolby Atmos
Disney+: Dolby Atmos

DTS remains standard on Blu-ray physical media, where DTS-HD Master Audio is found on most major studio releases alongside Dolby TrueHD.

Audio format pairs that come up most often:

Frequently Asked Questions

DTS (DTS Digital Surround) is the original lossy codec used on DVDs at up to 1,509 kbps for 5.1 channels — high bitrate but still lossy compression. DTS-HD Master Audio (DTS-HD MA) is the lossless variant used on Blu-ray discs that is bit-for-bit identical to the studio master recording. DTS-HD MA streams include a "core" DTS track for backward compatibility with devices that only support lossy DTS. When a Blu-ray player encounters DTS-HD MA, capable devices decode the full lossless stream; non-compatible devices fall back to the embedded DTS core.

For long-term archiving choose FLAC (lossless, ~50% the size of WAV). For everyday listening on phones and streaming use MP3 320 kbps or Opus 192 kbps (transparent quality, no audible difference at normal volumes). Avoid converting lossy → lossy → lossy: every step compounds artifacts.

Optical S/PDIF (TOSLINK) has a maximum bandwidth of about 1.5 Mbps, which supports DTS Core (up to 1,509 kbps) but not DTS-HD Master Audio (which can exceed 20 Mbps). If you are using an optical cable, you will receive the DTS core track, not the lossless DTS-HD MA. To receive full DTS-HD MA, you must use an HDMI connection (preferably eARC for maximum bandwidth). Additionally, optical does not support DTS:X object-based audio.

Spoken-word podcasts: 44.1 kHz mono, 64–96 kbps Opus or 96 kbps MP3. Music podcasts: 44.1 kHz stereo, 128–192 kbps. Going above wastes bandwidth — speech has limited frequency content above 7 kHz, and listeners on data plans appreciate the smaller file. Apple Podcasts and Spotify both accept up to 48 kHz / 320 kbps.

On DVDs, DTS has a bitrate advantage (1,509 kbps vs. 448 kbps for AC3) which translates to theoretically better quality, though the audible difference is small in practice and depends on content. On Blu-ray, DTS-HD Master Audio and Dolby TrueHD are both lossless, so there is no quality difference — any perceived difference is in the playback hardware or decoder. Streaming services favor Dolby (EC-3/Atmos) over DTS, making Dolby more universally accessible today.

Lossy → lossy compounds quantization noise. Each encode discards the same kind of perceptual information again, multiplying artifacts. Always re-encode from a lossless master if you have one (WAV, FLAC, or the original recording). If only an MP3 is available, keep the bitrate at or above the source — never go up to "improve quality".

Use FFmpeg with downmixing: `ffmpeg -i input.dts -c:a aac -b:a 256k -ac 2 output.m4a`. The `-ac 2` flag forces stereo downmix. FFmpeg will automatically apply the DTS channel coefficients for a proper downmix. For high quality, use 256–320 kbps AAC or Opus at 192 kbps. The downmix collapses the 5.1 spatial information to stereo — this loses surround sound but produces a file compatible with all stereo devices including phones, headphones, and computers.

Most modern tools (FFmpeg with <code>-map_metadata 0</code>, foobar2000, dBpoweramp) preserve ID3 tags and embedded cover art. Some quick-and-dirty converters strip them silently. KaijuConverter preserves tags in its <a href="/convert/flac-to-mp3">audio conversions</a>; if metadata is critical to you, verify the output with <code>ffprobe</code> before deleting the original.

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