I am working on a MLT bug report: "melt eats more memory than available" https://sourceforge.net/p/mlt/bugs/242/
It is still not yet clear if this large and complex project simply requires much memory, or if there is a leak. However, my suggestion to alleviate the problem can be considered successful: add "autoclose=1" to each MLT playlist when making the render XML. I have known about this for some time, suggested it in the past to users, and recently I added it to Shotcut. It is documented here [1]. The memory saving is not always dramatic as this particular case, but at least it will save many people from having a problem while rendering from the GUI - both of which can be memory hungry. Also, it might be a good, easy improvement to add to Kdenlive. [1] https://www.mltframework.org/doxygen/properties.html
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