Free online DAV to M4V converter

Security cameras and DVR systems often save recordings as DAV, while phones, editors, media players, and Apple software commonly expect M4V or an MPEG-4-compatible file. Converting the footage makes it easier to review, edit, share, and archive outside the original surveillance software.

What the DAV format is

DAV is a proprietary surveillance-video format used by many DVR, NVR, and IP-camera systems, especially devices from Dahua and compatible brands. Recordings exported from the recorder or downloaded from its desktop client may use the .dav extension and can contain proprietary encoding, timestamps, audio, watermarking, or encryption.

Standard media players and general-purpose converters may not recognize DAV correctly. The recorder’s vendor software, such as Dahua Smart Player or a model-specific playback utility, is usually the most reliable way to open the original file and export it to a conventional video format.

What the M4V format is

M4V is an MPEG-4 video container commonly associated with Apple devices and software. It generally contains H.264 video with AAC audio, although an M4V file can also contain MPEG-4 Part 2 video or other supported streams.

M4V is suitable for playback in QuickTime, Apple TV, iPhone and iPad workflows, media libraries, and many video editors. It offers broad compatibility and efficient compression, but changing the filename from .dav to .m4v does not convert the video; the DAV stream must be decoded and re-encoded or remuxed.

How to convert DAV to M4V

Using the surveillance player, then FFmpeg

1. Open the DAV file in the camera manufacturer’s player. In Dahua Smart Player, add the recording through Open File or the equivalent import command.
2. Export or convert the recording to AVI, MP4, or another standard format. Choose the original resolution and frame rate when the software provides those options. If the player offers a codec choice, select H.264 video and AAC audio.
3. If the exported file is already an H.264/AAC MP4, rename its extension to .m4v only when the destination program specifically requires M4V. A container remux avoids another quality loss:

ffmpeg -i input.mp4 -c copy output.m4v

If the exported file uses an incompatible codec, re-encode it with FFmpeg:

ffmpeg -i input.avi -c:v libx264 -crf 20 -preset medium -c:a aac -b:a 128k output.m4v

The -crf 20 setting provides high visual quality for typical surveillance footage; use a higher value such as 23 for a smaller file or a lower value for less compression. Preserve the source frame rate unless the target device requires a different one.

Using the online converter

You can convert the file for free on 101convert.com without installing software. Upload the DAV file, select M4V as the output format, start the conversion, and download the result when processing finishes. Avoid uploading recordings containing sensitive security, personal, or legally protected footage.

Quality and compatibility limitations

Most DAV-to-M4V conversions involve at least one decode and re-encode step, so some detail may be lost. Surveillance footage can show additional artifacts after compression, especially around faces, license plates, foliage, and nighttime motion.

If the exported intermediate file already contains H.264 video and AAC audio, use stream copying with -c copy to avoid generation loss. If the source has proprietary encryption, damaged indexes, or an unusual DAV variant, only the original recorder software may be able to decode it.

Keep the original DAV file and any player-generated export when the recording may be evidence. Conversion can remove proprietary timestamps, authentication data, watermarks, metadata, or the recorder’s chain-of-custody information.