rendering - .mp4 can be accessed normally outside blender but I can't make the sound work on blender vse preview or even render a video with audio - Blender Stack Exchange
audio - How to export a .blend file to .MP4? - Blender Stack Exchange
Blender-40 Export/Render/Convert Video in MP4 Format in Blender - YouTube
Problem with mp4, and transparency - Materials and Textures - Blender Artists Community
Blender convert a sequence of images into mp4 video