What is the DVR file format?
The .dvr file format is used by CCTV and security Digital Video Recorder systems to store recorded surveillance footage. A .dvr file holds the video stream from one or more cameras, often multiplexed together in a proprietary wrapper specific to the recording device.
Unlike consumer PC recordings, which Windows Media Center saves as .dvr-ms, plain .dvr files are produced by many different surveillance DVR and NVR brands - TVT, Grain Media, 247Security, WAPA, and others. Because there is no single .dvr standard, each manufacturer uses its own container or dumps a raw stream directly to disk with no common header.
Video data inside a .dvr file is typically encoded in H.264/MPEG-4, though older systems may use MPEG-2 or a vendor-specific codec. Some manufacturers apply light encryption or scrambling, which prevents generic players from opening the file.
.dvr files are generated by video recording devices - standalone recorders, NVR appliances, and network cameras with onboard storage. To play them on a PC, you usually need the bundled manufacturer software. Tools such as Amped DVRConv can convert many variants to standard .avi containers, and VLC media player handles many lightly wrapped H.264 streams.
Security & safety
RISK: MEDIUMA .dvr surveillance file is video data, not an executable - but the small "player.exe" that CCTV systems bundle with exported footage IS an executable, so run a bundled player only from a DVR you control, and scan it first. Avoid sketchy "DVR player/converter" downloads from ad portals (common adware/PUP vector around CCTV searches). For evidential footage, prefer offline conversion (vendor player, Amped DVRConv, FFmpeg) over public online converters to keep sensitive video private and preserve chain of custody.
Format details
in a nutshell- Microsoft Windows Media Center Recorded TV - WMC actually saved recorded TV as .dvr-ms (Win XP MCE/Vista) and later .wtv (Win 7); the plain .dvr label for MCE is largely a misnomer - the real files carry those extensions.
- ATI / Cyberlink TV tuner recordings - Some legacy PC TV-tuner software (e.g. ATI All-in-Wonder, CyberLink) wrote recordings with a .dvr extension.
Programs that open DVR files
Windows3 apps
VLC media player
Open-source Try opening the .dvr in VLC - works only if the stream is plain H.264/MPEG-4; many proprietary .dvr files won't play. 
Bundled DVR player / manufacturer software
Free Use the small player the DVR exported with the footage, or download your DVR brand's desktop player. This is the most reliable opener since the format is vendor-specific.
Amped DVRConv
Paid Drag CCTV/DVR files in to batch-convert proprietary surveillance formats to MP4/AVI; used in forensics/law-enforcement. 
macOS1 app
VLC media player
Open-source Try VLC on Mac - only succeeds for plain H.264 streams; proprietary brands need the vendor player (often Windows-only). Technical details
deep spec| Format type | Proprietary surveillance video recording - vendor-specific container or raw stream, with no published specification |
| Container structure | Varies by manufacturer: some use a lightweight binary envelope with a short header; others write a raw H.264 or MPEG stream with no container at all |
| Primary video codec | H.264 on most modern DVR units; older systems may use MPEG-4 Part 2 or MPEG-2 |
| Audio codec | G.711 μ-law or A-law PCM (mono, 8 kHz) in most security DVR systems; some units record no audio track |
| MIME type | application/octet-stream (no officially registered MIME type for this format) |
| File signature (magic bytes) | No universal signature - varies by DVR brand; many files begin with vendor-specific bytes or have no identifiable header at all |
| Encryption / scrambling | Light XOR or proprietary scrambling applied by some manufacturers to deter unauthorized export from the device |
| Multi-channel recording | A single .dvr file may carry interleaved streams from multiple camera channels, typically 4, 8, or 16 channels |
| Frame rate | Typically 25 fps (PAL regions) or 30 fps (NTSC regions); many DVRs record at reduced rates of 6-15 fps per channel to save storage |
| Common resolutions | D1 (720×576 PAL / 720×480 NTSC), CIF (352×288), and 720p or 1080p on newer HD systems |
| Timestamp and metadata | Recording timestamp, camera ID, and device info embedded in the proprietary header where one exists; field layout is vendor-defined |
| File size | Highly variable - multi-channel, multi-hour recordings can reach several gigabytes; channel count, frame rate, and compression level are the main factors |
| Related formats | .dav (Dahua DVR), .264 / .h264 (raw H.264 stream), .mp4, .avi - common conversion targets when exporting from a DVR |
| Disambiguation | Windows Media Center recordings use the distinct .dvr-ms extension, not plain .dvr; the two are unrelated formats |
| Released | 2000s (digital surveillance DVR/NVR systems) |
DVR conversions
Community Q&A
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