I can’t play some of my mp4 files
Not any mp4 can be streamed by default, it’s not an app limitation, it’s an mp4.
Assuming file works fine on your device you have to “hint” mp4 files to allow streaming.
Search something like this for info about how to do it:
MP4Box can help you with this:
Run this command:
MP4Box -hint file.mp4
My shares does not have user/password and I can not connect to them
Try “guest” as username. That’s all!