A problem has been detected with this installation of MKVToolNix: The versions of mkvmerge (51.0.0) and the GUI (1..) differ. Certain functions won't work correctly in this situation. Please re-install MKVToolNix or fix the problem manually.
libpng warning: iCCP: known incorrect sRGB profile
Now the video is packaged incorrectly, MediaInfo shows incorrect bitrate and fps.