mp4 can work with it. I´ve found it out, when I wanted to put out the new file, over the old one. When I´ve opened the final mp4 there where two windows with the video at the same time opened.
So: Yes there is a way with mp4, but I don´t know how to fix it with more "style". I mean... Rendering over a file that already exist looks a bit silly to me
For better understanding:
Putted out a video called: video.mp4
-watched the video and was not pleased with quality. So I made another output with the same name "video.mp4" and the "programm" didn´t asked me if I want to write over the file that already exist with the same name. So he writed over this video file... Yeah and after that he opens two windows with the same video in it, when I open the file.
Uhm... does it make sense to you? This is really not easy to explain for me...
Is that only possible with text?
In my example it is not like text. It is more a second preview window opened at the same time, with a different video stream.