MyMediaTools

Convert MOV to DSS — Free Online Tool

Convert MOV files to DSS (Digital Speech Standard) format using the ADPCM IMA OKI codec — a specialized audio encoding designed for digital dictation devices from Olympus, Philips, and Grundig. This tool strips the video and multi-track audio complexity of QuickTime containers down to a single low-bitrate speech-optimized stream compatible with professional dictation hardware and transcription workflows.

FFmpeg Command

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Estimated output:

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How It Works

MOV is a feature-rich container that may carry video streams, multiple audio tracks, chapter markers, and subtitles alongside its primary audio content encoded in AAC, MP3, FLAC, or other codecs. When converting to DSS, FFmpeg discards all video streams entirely and re-encodes the first audio track using the ADPCM IMA OKI codec — a variant of Adaptive Differential Pulse-Code Modulation tuned for the narrow frequency range of human speech. The resulting DSS file is a proprietary binary format with a fixed low bitrate, designed to maximize recording time on digital dictation devices rather than preserve audio fidelity. There are no quality tuning options in DSS: the codec and bitrate are fixed by the format specification itself.

What Each Flag Does

Flag What it does
ffmpeg Invokes the FFmpeg command-line tool. In this browser-based tool, the same binary runs via WebAssembly (FFmpeg.wasm), producing identical output to a desktop FFmpeg installation.
-i input.mov Specifies the input file as a MOV (QuickTime) container. FFmpeg reads all streams — video, audio, subtitles, and metadata — from this file, though only the audio stream will be used in the DSS output.
-c:a adpcm_ima_oki Sets the audio codec to ADPCM IMA OKI, the only codec supported by the DSS format. This re-encodes the MOV's source audio (typically AAC or PCM) into the low-bitrate, speech-optimized encoding required by Digital Speech Standard dictation devices.
output.dss Defines the output file with a .dss extension, which tells FFmpeg to use the DSS muxer. The format produces a proprietary binary container compatible with Olympus, Philips, and Grundig digital dictation systems.

Common Use Cases

  • Transferring a recorded interview or meeting captured on an iPhone (which saves as MOV) into a digital dictation system that only accepts DSS files for transcription
  • Converting voice memo recordings exported from Final Cut Pro or DaVinci Resolve as MOV files into DSS format for upload to a legal or medical dictation platform
  • Preparing spoken-word audio recorded on a mirrorless or DSLR camera (saved as MOV) for playback on an Olympus DS-series or Philips SpeechMike dictation recorder
  • Archiving or migrating dictation audio that was accidentally recorded via QuickTime Player into a DSS-compatible transcription service workflow
  • Extracting and re-encoding the audio narration from a screen recording MOV file into DSS format to feed into a legacy document management system that only accepts dictation formats
  • Converting briefing or deposition audio captured on Apple devices into DSS for import into transcription software such as Olympus Transcription Module or Philips SpeechExec

Frequently Asked Questions

No — DSS is a purely audio format with no video support whatsoever. The conversion process discards all video streams from your MOV file entirely. Only the first audio track is re-encoded into the DSS container using the ADPCM IMA OKI codec. If preserving video is important, DSS is not an appropriate target format.
Significant quality reduction is expected and by design. MOV files typically carry AAC or PCM audio at 128 kbps or higher with full frequency response, while DSS uses ADPCM IMA OKI at a very low fixed bitrate optimized exclusively for speech intelligibility in the 300–3400 Hz range. Music, sound effects, or high-fidelity recordings will sound noticeably degraded. DSS is purpose-built for voice dictation only, so if your MOV contains anything other than speech, the result may be difficult to listen to.
No. DSS with the ADPCM IMA OKI codec has no configurable quality or bitrate parameters — the format specification fixes these values. Unlike converting MOV to AAC or MP3 where you can set a target bitrate, DSS output is always encoded at the same fixed rate regardless of what options you specify. This is why the FFmpeg command for this conversion has no -b:a or -q:a flag.
By default, FFmpeg selects the first (or 'best') audio stream from the MOV file, which is typically the primary audio track. DSS supports only a single audio track, so all additional audio tracks — secondary languages, commentary tracks, or ambisonic channels — are discarded during conversion. If you need a specific non-default audio track, you would add a stream selector flag like -map 0:a:1 to the FFmpeg command to target the second audio stream.
No. The DSS format does not support chapters, subtitles, or rich metadata structures. Any chapter markers, embedded subtitles, or extended metadata present in the MOV container are silently dropped during conversion. Only the core audio content is encoded into the DSS output. If you need to retain this information, you should export it separately before converting.
You can use a shell loop to process multiple files. On macOS or Linux, run: for f in *.mov; do ffmpeg -i "$f" -c:a adpcm_ima_oki "${f%.mov}.dss"; done. On Windows Command Prompt, use: for %f in (*.mov) do ffmpeg -i "%f" -c:a adpcm_ima_oki "%~nf.dss". This applies the same ADPCM IMA OKI encoding to every MOV file in the current directory and outputs a matching DSS file for each.

Technical Notes

DSS is a proprietary format jointly developed by Olympus, Philips, and Grundig specifically for digital dictation hardware, and its use of the ADPCM IMA OKI codec reflects that specialized heritage. ADPCM (Adaptive Differential Pulse-Code Modulation) in the OKI variant encodes audio by storing differences between successive samples rather than absolute sample values, achieving very compact file sizes at the cost of audio bandwidth — the codec prioritizes the speech frequency range and performs poorly on broadband audio content. FFmpeg's DSS muxer and ADPCM IMA OKI encoder provide basic compatibility with this format, but the resulting files may not be recognized by all dictation hardware or software due to the proprietary nature of the DSS container header and the specific firmware expectations of individual device manufacturers. MOV files with sample rates other than those natively supported by the DSS specification (typically 8000 Hz or 11025 Hz) may be automatically resampled by FFmpeg during encoding — this is normal behavior. Transparency, subtitle streams, and chapter data from the MOV source are all incompatible with the DSS format and will be dropped without error. Because there are no quality parameters available, the only meaningful variable in this conversion is the source audio content itself.

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