The BR-HD50 can be configured to show information and the tape format via composite output to a monitor – I’m guessing you’ve got a few HD-SD60 tapes in the batch. There’s several ways to capture these – one I know works (for PAL anyway) is a sequence preset of HDV-720p60, capture preset of HDV, device control preset of HDV Firewire 60fps, set HD FW out on the BR-HD50 and then log/capture. I’ve changed the settings here to match your NTSC footage.
OR: Download the Apple FW SDK and use DVHSCap to capture the tape to a M2t file, then convert using Mpegstreamclip to whatever you want.
Just been playing with all this as I had some HD-SD60 tapes come in to be edited.