[mythtv-users] Question about Air2PC HDTV capture

John Andrunas john at andrunas.net
Wed Aug 29 04:57:02 UTC 2007

HD Capture requires very minimal processing power.  You should be fine for
that.  You can also set auto-transcoding, not sure what details you would
want to use though as I don't transcode anything.

On 8/28/07, Matthew Schroeder <blaupolisboxen at yahoo.com> wrote:
> Hello all, as they say on the radio: First time poster, long time reader.
> I am in the process of setting up my first mythbox.  Here are the relevant
> specs:
> Intel Motherboard with NO AGP or PCI-E slots
> 2.2Ghz Pentium4 Northwood
> 1024MB PC2700 SDRAM
> (2) 80GB PATA133 HDD, each on its own IDE channel
> Air2PC rev 0.2 "ebay special" ATSC card
> Video card: still gathering information, leaning toward the Nvidia FX5200
> PCI video card (fanless)
> I've been able to test the Air2PC ATSC card under windows with the
> included software (just got it last nite), and it works fine for SD
> content.  I get black screens when I try to view a HDTV stream, but since
> I'm still using the onboard video, this is most assuredly the culprit.  I
> will attempt a basic myth install tonite after I try to get the drivers
> installed in Linux.  Had a question in the meantime.
> Currently I am not interested in viewing HDTV at its native resolution.
> Plus the up front costs are still a bit too steep for me, at least to view
> LiveTV.
> I'm working with a two system setup, both machines have identical specs on
> the motherboard, CPU and RAM.  The frontend will eventually have a PCI
> FX5200 video card (no AGP available on these boards).
> I was wondering if it was possible for the linux drivers to capture/record
> the HDTV content for transcoding purposes, even if the capturing machine
> would be incapable of actually playing these HDTV files on its own?  I
> would think with a frontend/backend system, for strict ATSC capturing the
> backend shouldn't need much horsepower to actually save the stream, since
> it will not actually view the content.  Feel free to correct me on this.
> I'm looking for something that looks reasonable on a regular 27" analogue
> CRT television (S-Video) after some modest transcoding to smaller
> resolution H.264, Xvid, or MPEG2 for later viewing.  My local PBS station
> has both HDTV and SD subchannels broadcasting, but they do not always
> simulcast the same content.  Sometimes I want to pull a program from the
> HDTV stream, other times the SD.
> Does anybody out there have experience with this (or any other) type of
> ATSC card that allows the capture of HDTV streams, especially if the
> capturing machine cannot *view* the streams natively?
> A better question: Is there any way to just scale down the resolution on
> the fly so that HDTV streams could be viewed (albeit only at 640x480
> S-Video resolution) using the Live TV feature?
> I'd like the SD channels available for LiveTV capability, but I still want
> the HDTV channels available to record, even if I cannot view them live.
> So far the documentation I've found on this is a bit fuzzy on how to
> accomplish this.
> Thanks in advance for any comments.
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