This is what I have done. I frameserve from Flaskmepg to tmpgenc and made a 20 min mpeg 2.
Then I used the basic demultiplex in tmpgenc to make a video file and a audio file.
And I renamed video to vbs and I tried renamed to mpv as well. I put the video, audio and txt files in I-authors multiplexer and it makes a mps file that I put into nero as svcd but it goes in at once. But I burnet it even though it look wrong. And it won’t play in my kiss dvd play and not in my computer even. Thank you for your help in advance.