Hallo, i have some videos  and and they work over DLNA but when i try to play them over SMB i get the error "Failed to open the file". All videos are from the same website and other videos runs perfectly. Is there any known troubleshooting? Thanks for your help.

I'm not too sure. It's possible that your DLNA server is transcoding it to a different format that the player can play, or there might be something with the SMB setup that's preventing the player from accessing that specific video. Do you have the video specs (resolution, video and audio codec, bit depth, bit rate)?