In Premiere Pro CC 2017 I get a lot of red frames and errors playing back a .MXF file. So converting to h264 seems to be a good way avoiding these errors. Now the internet is full of 'free' programs that do this for you, but they all seem a bit sketchy. Do any of you know a good program that can convert these files, if possible in bulk?
No idea about your playback errors, but you should (MXF is a container format, so it all depends on what is inside the file) be able to use the Adobe Media Encoder to convert MXF files to H264. You can see the list of supported file formats here:
Adobe Media Encoder can convert files in bulk with no problem, you can also set up "watch folders", so that it will auto-convert anything you drop in that folder. See: