Date: Thu, 21 Jun 2012 16:29:26 -0400 From: "Dieter BSD" <dieterbsd@engineer.com> To: freebsd-multimedia@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: (no subject) Message-ID: <20120621202927.303410@gmx.com>
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user.vdr writes:
>>> Recording doesn't require any compression unless you are transcoding
>>> in real-time. There's no difference between recording ATSC, NTSC, PAL,
>>> etc, and it's actually irrelevant what the stream is.
>>
>> This is incorrect. ATSC is compressed before broadcast, so
>> you receive the data already compresed. NTSC and PAL are
>> broadcast in analog. The tuner performs A-to-D which gives
>> an uncompressed data stream. Have fun trying to store that.
>> As a practical matter, you have to compress the data in real time.
>> Some, not all, tuners include hardware compression.
>
> With very very very few exceptions, all analog NTSC broadcasts have
> been switched to digital, by the FCC mandated deadline of June 12,
> 2009.
As long as there remain some NTSC broadcasts, there might be some
that you wish to watch. That's why I wrote:
>>>> You'll need to know if you have any NTSC (analog) stations you
>>>> care about or if everything is ATSC (digital).
Aryeh may or may not have any NTSC stations of interest. Given
"we are using a broadcast signal only [current US {NYC} standards]"
I rather doubt that Aryeh has any PAL stations to worry about.
> 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.
> Tuners do NOT provide raw audio/video to the system in any case.
http://corona.homeunix.net/cx88wiki/Overview/RawVideo
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