Associated .MP4 software

Windows
MP4 file extension
MPEG 4 Video File
.MP4 (MPEG Audio Layer 4) is a multimedia container format, and is often used to store digital audio/video streams. The MP4 format can hold many different types of data such as audio, video, pictures and even text.
As the file is a container/wrapper format, it can potentially store any number of files making it ideal for holding video with subtitles or enhanced podcasts with pictures.
that means converting from one extension to other with keeping sound and movie as same when recorded.