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I live in Japan and simply refuse to buy "a TV" or commercial DVR. I used MythTV for years and years in the US with complete satisfaction. And horror of horrors, Japan doesn't use NTSC.
Now I'm having to learn about and endure the whole ISDB-T + B-CAS thing they have here in Japan. In addition to using ISDB-T for terrestrial digital broadcast, they have this silly little B-CAS card thing that must be plugged in in order to receive anything other than tsunami warnings.
I posted a Japanese translation of this post and it bounced. I'll hunt for Japanese language lists/forums devoted to v4l, etc. But if anyone has any pointers, even other English language resources that might be helpful, that'd be super.