[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.
Mike
>
> 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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