[mythtv-users] [OT] Trancoding 'live'

Michael T. Dean mtdean at thirdcontact.com
Sun Dec 4 21:51:09 EST 2005

Chris Ribe wrote:

> I think that is actually the roundtrip Glen is worried about.  He 
> would like to capture ATSC HD content and downconvert  it for an NTSC 
> display, thus keeping the signal digital until the final output for 
> display.

Right.  It's "the exact same roundtrip."  I'm just pointing out that he 
may have already seen it if he had previously set up a cable/satellite 
receiver with Myth--even if he didn't realize he was seeing it in that 
context.  If he has seen it, he will know what to expect.


> On 12/4/05, *Michael T. Dean* <mtdean at thirdcontact.com 
> <mailto:mtdean at thirdcontact.com>> wrote:
>     glen martin wrote:
>     >glen martin wrote:
>     >
>     >>Michael T. Dean wrote:
>     >>
>     >>
>     >>My front-end can't support HD playback, and my TV can't display
>     it. But
>     >>I like the aspect ratio and extra channels (eg. 5 subchannels on
>     PBS) of
>     >>ATSC.
>     >>
>     >>>your best option for "live" transcoding from ATSC -> NTSC is
>     plugging
>     >>>the S-Video/Composite out of your cable box into a PVR-x50.  If
>     you're
>     >>>using OTA instead of cable, you could get a STB ATSC receiver
>     (like
>     >>>http://www.bestbuy.com/site/olspage.jsp?skuId=7292146&type=product&productCategoryId=cat03022&id=1118840815760
>     <http://www.bestbuy.com/site/olspage.jsp?skuId=7292146&type=product&productCategoryId=cat03022&id=1118840815760>
>     >>>-- note that I don't recommend this one as I've never used it, but
>     >>>it's the type of thing you would need).
>     >>>
>     >>That's an approach I hadn't considered. So for OTA use, I could get
>     >>something like this standalone ATSC receiver, set it for 480i
>     output,
>     >>feed that into a PVR-250 through the s-video input, and use
>     MythTV as
>     >>usual including pause etc. Interesting. I had a mental block on
>     that,
>     >>but seems obvious once you suggest it.
>     >>
>     >The only downside seems to be a roundtrip through analog between the
>     >external box and the PVR-250.
>     >
>     >
>     Believe it or not, it's the exact same roundtrip you get with a
>     Digital
>     Cable/Satellite STB...  Just don't tell anyone or we might have a
>     lot of
>     people starting to notice "artifacts" from the D/A -> A/D -> D/A (and
>     add in an A/D before the process if the network feed to the
>     cable/satellite company is analog instead of digital) process they
>     didn't realize they were using.  :)
>     Mike
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