For the reproduction of video files in MB STUDIO the correct installation and configuration of the LAV video codecs is required
Download the codecs in the standard package from this page: https://codecguide.com/download_k-lite_codec_pack_basic.htm
After installing the codecs open the "Codec Tweak Tool" 
Click on Win7DSFilterTweaker: Preferred decoders 
in the 32 bit column set all the options available on LAV Video 
click on "Direct show Filters" 
click on LAV Video decoder 
and configure everything as in this image: 
click on "LAV Audio decoder" 
and disable the option "Enable System Tray Icon" 
click on LAV Splitter 
and configure everything as in this image: 
In windows, enable the display of all notification icons:
This is necessary because you have to check that while MB STUDIO plays a video file, the red icon LAV VIDEO + the white LAV icon in the taskbar indicates that MB STUDIO is using the right LAV codecs 
If the red + white LAV icon is not present, it means that MB STUDIO is not using the provided codecs and video may be black or completely out of sync or other malfunctions.
To speed up video mixes in MB STUDIO enable video prebuffer: 
from Control Panel click on Power Options 
and set "High Performance"
MB STUDIO is a radio automation software that will allow you to create and manage your own radio station playing all your media files: jingles, commercials, news, songs, Files from internet, live streams, live inputs from your sound card, satellite feeds. Automatically download news and shows from Internet. Multiple overlapping files and/or live sources (mic, line, aux). Voice tracking. Integrated CD Ripper. Integrated jukebox to play songs requested via sms / email messages. Display current playlist on your web site.
MB RECASTER features an audio recorder with scheduler, a webcast module to send streams to any Shoutcast, Icecast or Windows Media server, AutoDJ function to play randomly your own audio files from up to 4 folders, a stream receiver allowing to record or recast to your server (transcoder), an audio converter from/to any format.
MB LIVE is a software that stream a live audio feed from any place to an MB STUDIO PRO automation in the main radio studio. MB LIVE make use of a TCPIP connection and is fully configurable with 2 different audio codecs: MP3 and OPUS. This program is free for MB STUDIO PRO users