Here’s that tutorial I mentioned: MLT2EDL script error fix
If you need to zero the embedded time codes in your source files, it can be done with Eyeframe Converter:
However the settings for only changing the time code and copy everything else(very fast) is not included. So it must be made along these lines(efc is a GUI for ffmbc): https://stackoverflow.com/questions/9974278/copying-timecode-into-output-file-ffmpeg-or-ffmbc