Convert DVR to WAV — Free Online Tool
Convert DVR recordings to WAV audio by extracting the AAC audio track and decoding it to uncompressed PCM (16-bit signed little-endian) — ideal for archiving surveillance or broadcast footage audio with no further quality loss. The resulting WAV file is universally compatible with audio editors, transcription tools, and broadcast workflows.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your DVR file here
or click to browse
Free — no uploads, no signups. Your files never leave your browser.
Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
DVR files store video (typically H.264/libx264) and audio (typically AAC) in a proprietary container used by digital video recorders. During this conversion, FFmpeg discards the video stream entirely and decodes the AAC audio track, which is a lossy compressed format, into raw uncompressed PCM audio encoded as 16-bit signed little-endian samples — the standard PCM_S16LE codec used in WAV files. Because AAC is lossy, the original audio data cannot be perfectly reconstructed, but the resulting WAV captures the full fidelity of what was stored in the DVR file without any additional compression step. The output WAV file will be significantly larger than the audio portion of the DVR source because uncompressed PCM carries every sample explicitly rather than using codec compression.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary, the open-source multimedia processing engine that this tool runs in your browser via WebAssembly (FFmpeg.wasm). All subsequent arguments are parsed by FFmpeg to define the conversion. |
-i input.dvr
|
Specifies the input file in DVR format — a proprietary container typically produced by surveillance or broadcast digital video recorders, containing an H.264 video stream and an AAC audio stream. |
-c:a pcm_s16le
|
Sets the audio codec for the output to PCM signed 16-bit little-endian, which is the standard uncompressed audio encoding used in WAV files. This decodes the lossy AAC audio from the DVR container into raw PCM samples, producing a WAV file with no further compression or quality degradation beyond what the original AAC encoding already applied. |
output.wav
|
Defines the output filename and tells FFmpeg to write a WAV container. FFmpeg infers the WAV format from the .wav extension and, combined with the pcm_s16le codec, produces a standard uncompressed WAV file compatible with virtually all audio software, forensic tools, and broadcast ingest systems. |
Common Use Cases
- Extracting audio from surveillance DVR footage to submit as evidence in legal proceedings, where WAV is required as a lossless-delivery container by the receiving institution
- Pulling audio from recorded broadcast captures stored in DVR format for ingestion into a professional DAW or non-linear editor that requires uncompressed WAV input
- Archiving the audio track of DVR security recordings in a non-proprietary format so the content remains accessible after the DVR hardware or software is retired
- Preparing DVR-recorded audio for automatic speech recognition or transcription services that only accept WAV files with PCM encoding
- Converting DVR camera audio to WAV for waveform analysis tools used in forensic audio examination, where uncompressed PCM is mandatory
- Extracting interview or meeting audio captured by a DVR system for podcast post-production, where WAV serves as the lossless editing master before final export
Frequently Asked Questions
No — the audio stored in a DVR file is encoded as AAC, which is a lossy format. Any quality loss introduced during the original DVR recording is permanent and cannot be recovered by converting to WAV. The conversion decodes the AAC stream to uncompressed PCM, so the WAV file is a lossless representation of what the AAC codec preserved, but it is not higher quality than the AAC source. WAV is the right choice when you need a container that introduces no further quality degradation for downstream processing.
WAV with PCM_S16LE encoding stores every audio sample as a raw 16-bit integer with no compression, typically producing files at roughly 10 MB per minute for stereo 44.1 kHz audio. The AAC audio inside the DVR file is heavily compressed, often at 128 kbps, which is around 1 MB per minute. The size difference is expected and normal — you are trading storage space for a universally readable, uncompressed format. The video stream from the DVR is also dropped entirely, so the WAV will only contain the audio duration, not the full original file size.
DVR files use proprietary container formats that often store metadata in non-standard fields that FFmpeg cannot reliably read or map. WAV files also have very limited metadata support compared to modern containers. In practice, most recording timestamps, channel labels, and camera identifiers embedded in the DVR container will not carry over to the WAV output. If metadata preservation is critical — for example, in a legal or forensic context — you should document the source metadata separately before conversion.
Yes. Replace '-c:a pcm_s16le' with '-c:a pcm_s24le' in the command to produce 24-bit signed little-endian PCM, which is a common requirement for professional audio workflows and broadcast delivery. Other valid options for WAV include 'pcm_s32le' (32-bit integer), 'pcm_f32le' (32-bit float), and 'pcm_u8' (8-bit unsigned). Since the source AAC audio in the DVR is typically 16-bit quality or lower, going beyond pcm_s24le is unlikely to yield audible benefit but may be required to meet a specific technical specification.
Yes. On Linux or macOS you can use a shell loop: 'for f in *.dvr; do ffmpeg -i "$f" -c:a pcm_s16le "${f%.dvr}.wav"; done'. On Windows Command Prompt use: 'for %f in (*.dvr) do ffmpeg -i "%f" -c:a pcm_s16le "%~nf.wav"'. This applies the same command to every DVR file in the current directory and outputs a matching WAV file for each. Batch processing is particularly useful when archiving large collections of surveillance recordings from a retired DVR system.
WAV is a pure audio container — it cannot store video data at all. FFmpeg automatically omits the video stream when the output format has no video codec, so no explicit '-vn' flag is needed in this command. If you need to retain the video while also getting the audio, you would convert to a video container like MP4 or MKV instead, or run a separate FFmpeg command using '-vn' alongside the DVR-to-WAV command to produce both outputs.
Technical Notes
DVR is a catch-all term for proprietary container formats produced by digital video recorder hardware from manufacturers such as Hikvision, Dahua, and others. FFmpeg's ability to demux a given DVR file depends on which proprietary variant it is — some are based on standard MPEG-PS or MP4 structuring and open cleanly, while others use fully proprietary byte structures that FFmpeg may only partially support or misidentify. The audio codec inside is most commonly AAC at 128 kbps, though some systems use MP3 (libmp3lame) at lower bitrates for storage efficiency. The output WAV uses PCM_S16LE, which is the most universally compatible WAV subformat — supported natively by Windows, macOS, virtually all DAWs, and broadcast ingest systems. WAV files do not support chapters, subtitle tracks, or multiple audio tracks, and since DVR files similarly lack these features, no data is lost in that regard. One known limitation is that if the DVR file has a variable-frame-rate audio stream or uses non-standard sample rates (some DVR systems record at 8 kHz for telephony-grade audio), FFmpeg will resample or pass through accordingly — you can add '-ar 44100' to the command to force a standard sample rate in the output if your downstream application requires it.