Is it possible to directly convert .dv4 videos to .mp3 format?
It appears that converting Bosch Security Systems CCTV Video Files directly to MP3 Audio Files (.dv4 to .mp3 conversion) is, per se, not possible; at least not without a workaround.
You might first convert DV4 to MP4, which is only possible using the original software bundled with the Bosch Security Systems package. Then you can easily convert MP4 to MP3.
The database currently does not contain any dv4 software converter.