Date: Fri, 22 Jun 2012 11:27:30 -0400 From: "Dieter BSD" <dieterbsd@engineer.com> To: freebsd-multimedia@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: Re: how to turn my computer into a TV Message-ID: <20120622152731.303450@gmx.com>
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user.vdr writes: >> As long as there remain some NTSC broadcasts, there might be some >> that you wish to watch. That's why I wrote: > > Yes, technically there are still some that exist, for now. However, > their death certificate is signed and they're so few that it's not > worth mentioning. If you don't think NTSC is worth mentioning, why do you keep posting the same incorrect statements over and over again? >>> You absolutely do NOT have to reencode a stream >> >> I did not say anything about RE-encoding anything. Only about >> encoding/compressing the high bandwidth datastream the tuner >> generates from NTSC. And to be clear, this only applies to >> NTSC, not to ATSC. > > NTSC streams are not broadcast raw. What do you call encoding data > that's already encoded if you don't think it's reencoding? Also, doing > so causes degredation so unless there's a need for the user to do so, > he's better off not wasting his time. NTSC is not a stream of bits. NTSC is analog. The tuner converts the NTSC analog waveform into a raw stream of bits. This raw stream of bits is too large to conviently store on disk, so it needs to be compressed/encoded into mpeg or similar. Some tuners include a hardware encoder, but many do not. >>> Tuners do NOT provide raw audio/video to the system in any case. >> >> http://corona.homeunix.net/cx88wiki/Overview/RawVideo > > While that's technically possible in _some_ cases, and assuming it's > fully implemented and functional, I'm unaware of any software that > actually provides raw data to the user. I suppose I should have worded > my point differently. The cx88wiki URL above describes the cx88 software (in ports). For tuners without a hardware encoder, raw video/audio is the only thing you can get from the tuner when receiving NTSC.
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