Are you using Windows? Are the filenames and folder names giving you problems long? It could be that the files are exceeding Windows 260 character limit. This usually happens when the files are moved into a sub-folder because it adds more characters. If so, I posted about that some time ago, but unfortunately, it was never resolved even after posting the log file that was deleted for some reason.
https://forum.videolan.org/viewtopic.ph ... 91#p516491