Extract Audio from DVR to WAV — Free Online Tool
Extract audio from DVR recordings and save it as an uncompressed WAV file using PCM 16-bit signed little-endian encoding. This is ideal for archiving surveillance or broadcast audio at full quality, stripping the H.264 or MJPEG video entirely and producing a lossless PCM audio file compatible with virtually any audio editor or analysis tool.
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 typically carry AAC-encoded audio alongside a video stream encoded in H.264 (libx264) or MJPEG. During this conversion, FFmpeg discards the video stream entirely and decodes the AAC audio, then re-encodes it into PCM 16-bit signed little-endian (pcm_s16le) — the standard uncompressed audio format used inside WAV files. Because AAC is a lossy codec, the original compression artifacts are preserved in the decoded signal; no additional quality is lost in the transcoding step to PCM, but the audio is not restored to its pre-AAC state. The resulting WAV file contains raw, uncompressed audio samples, which is why WAV files produced from DVR recordings are significantly larger than the audio portion of the source file.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary, the open-source multimedia processing engine that handles demuxing the DVR container, decoding the AAC audio stream, and re-encoding to PCM WAV format. |
-i input.dvr
|
Specifies the input DVR file. FFmpeg will probe this file to detect the container structure and identify the available streams — typically an H.264 or MJPEG video stream and an AAC audio stream. |
-vn
|
Disables video output entirely, instructing FFmpeg to skip the H.264 or MJPEG video stream from the DVR file. This is essential because WAV is a audio-only container and cannot hold video data. |
-c:a pcm_s16le
|
Decodes the AAC audio from the DVR file and re-encodes it as 16-bit signed little-endian PCM — the standard uncompressed audio codec used inside WAV files, ensuring maximum compatibility with audio editors, forensic tools, and broadcast systems. |
output.wav
|
Defines the output filename and format. The .wav extension signals FFmpeg to wrap the pcm_s16le audio stream in a RIFF WAV container, producing an uncompressed audio file ready for editing, archiving, or analysis. |
Common Use Cases
- Extract spoken announcements or intercom audio from surveillance DVR footage for use as evidence in a legal or insurance claim, where uncompressed WAV is the required format for court submission.
- Pull the audio track from a DVR broadcast capture to import into a digital audio workstation (DAW) like Adobe Audition or Pro Tools for noise reduction, transcription, or archiving.
- Convert DVR security camera audio to WAV for analysis with audio forensics software that requires uncompressed PCM input and cannot read AAC streams inside proprietary DVR containers.
- Archive the audio commentary or live event audio recorded on a DVR set-top box as a lossless WAV file before the DVR storage is overwritten or the device is decommissioned.
- Extract audio from a DVR recording of a broadcast television program to produce a clean WAV file for closed-caption alignment or accessibility review workflows.
- Prepare DVR-captured audio for ingestion into a speech-to-text or machine learning pipeline that requires standardized uncompressed WAV input at a fixed bit depth.
Frequently Asked Questions
No. DVR files store audio in AAC, which is a lossy compressed format. The compression artifacts introduced when the DVR originally encoded the audio are permanently baked into the signal. Converting to WAV uses PCM 16-bit encoding, which is lossless and uncompressed, but it preserves the decoded AAC audio exactly as-is — it does not recover detail that was discarded during the original AAC encoding. The benefit of WAV is that no further quality loss occurs in future editing or processing steps.
AAC audio inside DVR files is heavily compressed, typically at 128 kbps, which achieves a high compression ratio by discarding audio data the human ear is less sensitive to. WAV with pcm_s16le stores every audio sample as a raw 16-bit integer with no compression at all, resulting in a bitrate of approximately 1,411 kbps for stereo 44.1 kHz audio. A one-hour DVR recording's audio track might consume around 57 MB as AAC but expand to over 600 MB as an uncompressed WAV file.
WAV files have very limited metadata support compared to container formats like MKV or MP4. DVR-specific metadata such as recording timestamps, camera channel identifiers, or DVR system information are stored in proprietary structures within the DVR container and are not transferred to the WAV output. Standard audio metadata like sample rate and bit depth are written into the WAV header, but DVR operational metadata is lost. If preserving timestamps is important, consider logging them separately before conversion.
Yes. The command uses pcm_s16le for broad compatibility, but WAV supports several PCM variants. You can substitute -c:a pcm_s24le for 24-bit audio or -c:a pcm_s32le for 32-bit audio by modifying the command. However, since the source audio is AAC encoded at 128 kbps, using a higher bit depth will not recover any lost detail — the decoded signal will simply be stored in a wider container. For most DVR audio use cases, 16-bit PCM is sufficient and produces smaller files.
You can adapt the command in a shell loop. On Linux or macOS, use: for f in *.dvr; do ffmpeg -i "$f" -vn -c:a pcm_s16le "${f%.dvr}.wav"; done. On Windows Command Prompt, use: for %f in (*.dvr) do ffmpeg -i "%f" -vn -c:a pcm_s16le "%~nf.wav". Each DVR file will be processed sequentially, with the video discarded and the audio saved as a separate WAV file with the same base filename. This is especially useful for processing large archives of surveillance recordings.
Yes, the command works regardless of whether the DVR file's video stream is H.264 or MJPEG, because the -vn flag tells FFmpeg to ignore the video stream entirely. FFmpeg reads the container, identifies and decodes the AAC audio stream, and converts it to PCM WAV without touching the video codec at all. MJPEG and H.264 are both discarded identically during this extraction.
Technical Notes
DVR is a proprietary container format with varying implementations across manufacturers, which means FFmpeg's ability to demux DVR files depends on how closely the file conforms to recognized DVR container structures. The audio stream inside DVR files is most commonly AAC at 128 kbps stereo, though some DVR systems use MP3 (libmp3lame). The command targets the default AAC case. The output codec pcm_s16le produces a standard RIFF WAV file with a 44-byte header containing sample rate, bit depth, and channel count — all derived from the decoded AAC stream's properties. Because DVR files do not support subtitles or chapters, there is no risk of those elements interfering with the extraction. The -vn flag is critical here: without it, FFmpeg would attempt to include the video stream in the WAV output, which WAV cannot contain, causing the command to fail or produce an error. WAV files produced this way carry no encryption or DRM and are immediately compatible with broadcast audio tools, DAWs, and forensic analysis platforms that require uncompressed PCM input.