Video recordings (*.dav) made using the Mac DVR-1600HP cameras and perhaps other devices can be exported to MP3 format with programs like Bigasoft Total Video Converter. Just keep in mind that the resulting file will only have the audio track, not the video. If you want both, you need to convert it formats like MP4.
Convert DVR365 encrypted video recording to Compressed audio and music file, mp3 songs or ringtones.
We found one software available in the database for this conversion.
Microsoft Windows software - convert dav to mp3 on Windows
A video conversion utility
Convert from dav file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.