Convert BR4 to MP4

Converting BMW iDrive Multimedia Data Format directly to MPEG-4 Videos (.br4 to .mp4 conversion) might be possible, even though your options are limited. It relates to users attempting to encode BR4 audio to MP4 video.

It appears that your only option is using a special utility, such as BRx Konverter or bmwconv, which should allow users to import BR4 audio and export it in MP4 format.