Conversion of mp4 files to docx file format

In order to convert the audio (voice) from MP4 and save it as document or text file, you need to use a dedicated transcription service which does offer video/audio to text conversion options. You can find some software solution for this (including mp4 to docx conversion), but it usually requires human post-processing because it's not perfect, especially in case of complex speech.

Open MP4 file    Open DOCX file