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

Chris Ribe chrisribe at gmail.com
Sun Dec 4 21:44:56 EST 2005

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.

On 12/4/05, Michael T. Dean <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
> >>>-- 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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