I have some problems during rendering .mp4 files, I have to use MPEG-2 profile which is really perfect for me. There is a small but...
The source video file use yuvj420p (instead of yuv420p by default in kdenlive profiles), so it means if I used yuv420p contrast is smaller and black is less black than with yuvj420p. I did manage with mp4 files as I added to my favorite profile this line 'pix_fmt=yuvj420p' but in MPEG-2 aftr adding this line 'pix_fmt=yuvj420p' after rendering I have got file yuv420p.
It is posibble to have yuvj420p in MPEG-2 profile?