DAV file not playing points to a player that lacks the right decoder. Recorders save footage in DAV and common players cannot open it. Install the player your recorder maker supplies. Lorex tells owners to use its free Lorex Player. Open the file with the Add Files icon. Repeat the export when the copy looks damaged.
You copy a clip from your recorder and double click it. Nothing plays or the picture stays black.
You get the causes, 6 fix steps and the limits I check first. Steps follow Lorex manuals and recorder forum reports.
What is the DAV Format on a Recorder?
Lorex manuals say recorders save backups as .dav files when you select DAV as the file format. An IPVM forum post calls DAV a proprietary Dahua movie format.
The format wraps video frames in its own header. The guide on WFS and DHFS file systems shows the DHAV marker that Dahua frames carry.
What Causes DAV Playback Errors?
Three causes cover most reports. The table pairs every one with the first fix.
| Cause | Sign | First fix |
|---|---|---|
| Wrong player | Black screen or an error | Install the maker player |
| Damaged copy | Plays then stops | Export the clip again |
| Wrong system | No player for your OS | Check Windows and Mac options |
How do You Fix DAV Files Not Playing?
Who it suits. Owners with a clip on a USB disk and a Windows PC. Extra application. The player from your recorder maker.
Steps below follow the Lorex manual for backup playback. Other makers use their own player names.
- Check the extension. The file name must end in .dav.
- Download the maker player. Lorex says to get Lorex Player from the product page of your recorder.
- Install the player. Complete the setup on your PC.
- Open the file. Double click a file in the Group File List or use the Add Files icon.
- Try a fresh copy. Back up the clip once more from the recorder.
- Check the USB disk. Lorex recommends FAT32 for the best compatibility.
Heads Up. FAT32 cannot hold a file above 4GB. Lorex says NTFS suits larger drives where files exceed 4GB.
Why does VLC Fail to Play a DAV File?
An IPVM post says VLC detects a DAV clip as H.264 video but cannot play it. That post is old. Test your own file before you rely on it.
An EduGeek thread points to Dahua Smart Player and SmartPSS as the tools that open DAV for police and owners.
Can You Play DAV Files on a Mac?
Lorex says you can download Lorex Player for PC or Mac from the product page of your recorder.
The IPVM post mentions a free Mac player but its author could not trace the source of the app. Use the maker download instead.
Why does a DAV Clip Stop Halfway?
A DAV file not playing to the end points to an incomplete or damaged copy. Back it up again and wait for the recorder to confirm the copy before you unplug the USB disk.
Compare the new file size with the old one. A second copy that plays fully tells you the first export failed.
What Limits Apply to These Fixes?
- Maker players. Player names differ by brand and Lorex Player is the Lorex example.
- Forum reports. The VLC note comes from an older post.
- Damaged files. A player cannot repair missing frames.
- Format choice. Recorder menus differ on which file formats they offer.
Which Habits Prevent DAV Playback Problems?
- Save the player. Keep the maker installer next to your backups.
- Format the USB disk in the recorder. Lorex recommends formatting before use.
- Test one clip. Play a short file before you copy a long one.
- Learn the route. The guide on how to play CCTV footage on a PC lists more options.
Which Mistakes Waste the Most Time?
- Renaming the file. A new extension does not change what is inside.
- Trusting any free player. Download from the recorder maker.
- Unplugging the USB disk early. The copy can stop short.
- Deleting the clip from the recorder. Confirm a good copy first.
My Verdict on Recorder DAV Files
Use the player from your recorder maker and skip general players at first. Export the clip again before you assume the footage is lost.
Keep one tested copy of every important clip.
Key Takeaways
- DAV is a recorder format that common players cannot open.
- Lorex tells owners to use Lorex Player for DAV files.
- FAT32 suits files under 4GB and NTFS suits larger ones.
- A fresh backup fixes many damaged copies.
Next Read
Frequently Asked Questions
Is DAV a Normal Video Format Like MP4?
No. An IPVM post calls DAV a proprietary Dahua movie format. Common players do not open it by default.
Does Lorex Save Backups as DAV?
Yes. Lorex manuals say backups save as .dav files when you select DAV as the file format.
Does Lorex Player Open Lorex DAV Files?
Yes, the manuals say so. Download it from the product page of your recorder at lorex.com.
Can VLC Play My DAV File?
No in the old IPVM report. VLC detected H.264 but could not play the clip. Test your own file.
Should I Rename .Dav to .Mp4?
No, because renaming does not change the data inside. The player still cannot decode it.
Does the USB Disk Format Matter?
Yes. Lorex recommends FAT32 for compatibility and NTFS for drives over 32GB with files above 4GB.
Can I Back up the Clip Again if It Fails?
Yes while the footage is still on the recorder. Repeat the backup and test the new file.
Jamie blends strategic marketing insight with technical writing, turning migration and recovery topics into guidance that works for technical and general readers alike.
Published 3 November 2026. Player and backup facts come from the Lorex D841 and N881 series manuals. The VLC note comes from an older IPVM forum post and the Smart Player note from an EduGeek thread. Player names differ by recorder maker. Check the manual of your own model.