Definitely don't try to do rendering and gaming at the same time. Depending on how powerful your computer is, it may or may not be a good idea to try to do other tasks while rendering is in progress. If you have a really large file (or a really slow computer) you may even want to start exporting after you're done for the night so that it can render while you sleep. This is called 'rendering' and it may take a while. Now you're done in OpenShot and you will have the mp4 wherever you told it to save the file.

A progress bar will tell you how far along it is and when it's done it will turn bright green.

Plus, it can also be used to adjust video parameters (video resolution, sample rate, volume. It is an FFmpeg based video converter through which you can convert video files of many formats such as MP4, AVI, DIVX, MPEG, MOV, OGV, ASF, and more. Your files are securely protected and available only to you. Select files for conversion or drag and drop them to the upload area.

Click the Export Video button and it will start creating your video. QWinFF is free a free open source video converter software for Windows, Ubuntu, FreeBSD, and Fedora. Make sure you have saved your project (Ctrl-S), then hit Ctrl-E or click the red Export button at the top, give your soon-to-be MP4 a name, note what folder. Change opus to mp4 on Windows, Mac, Iphone or Android in a couple of clicks. A dialogue box will pop up allowing you to name your video, designate the folder where you want it created, choose any export settings you want, etc. osp file open in OpenShot, make sure everything is saved, and go to File > Export (or Ctrl-E on a PC).

How to convert osp to mp4