Many multimedia conversion programs supports both the MPEG-4 (*.mp4) and the Dolby Digital (*.ac3) format and thus are quite capable of converting one to another. The output will always be only audio track, even if the original was a video (the audio track will be exported).
Convert MPEG-4 video file format to Dolby Digital sound.
We have found 14 software records in our database eligible for .mp4 to .ac3 file format conversion.
Microsoft Windows software - convert mp4 to ac3 on Windows
A timeline-based video editing software from Adobe
Convert from mp4 file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned mp4 to ac3. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A DRM remover and media converter
A multimedia converter
One of the most popular and succesfful free video conversion sofrware
A free universal media transcoder for Windows
Universal All Purpose Free Media, Audio & Video Converter Player Recorder
One of the many video conversion programs
A video converter software
Apple macOS / Mac OS X software - convert mp4 to ac3 on OS X
A multimedia converter software
Mac version of popular video conversion software