[mythtv-users] Recording problems with PVR-350 and MythTV 0.24.3
David Parker
parker.david.a at gmail.com
Thu Sep 27 03:47:12 UTC 2012
On Wed, Sep 26, 2012 at 1:58 AM, <f-myth-users at media.mit.edu> wrote:
> > Date: Wed, 26 Sep 2012 01:19:36 -0400
> > From: "Michael T. Dean" <mtdean at thirdcontact.com>
>
> > You're likely to get better quality output using an nvidia video card
> > with CPU decoding than you'd get with PVR-350 decoder output or PVR-350
> > Xv output.
>
> Why? Particularly, if you've got interlaced SD content recorded from
> a PVR-x50, and you're displaying on an interlaced SD CRT, what makes
> you say that an nvidia card will be superior? Especially since it's
> difficult to find modern cards that support (say) S-Video output,
> which is typically what an SD CRT accepts, so you might have to do
> something unpleasant like use a VGA-to-S-video converter. [I know you
> personally regretted buying a PVR-x50 long long ago, but I'd like to
> know if there is some objectively-better result using an nvidia card
> instead in this particular case. I'm talking straight video quality
> here, not all the other stuff that Myth might want to overlay when
> using its menus.]
>
> [I'm ignoring wss or direct line-21 CC support here, which I suspect
> no nvidia card can give you, but the 350's decoder can.]
>
> Yes, I'm guessing that the OP has an SD CRT and not something else,
> but if he was actively using the PVR-350's decoder, that seems likely.
>
> > The biggest problem you'll have, though, is if you still need TV out
> > (i.e. Composite/S-Video/SCART or whatever) versus a "real" output (VGA,
> > DVI, HDMI, ...), you may find it hard to come by an nvidia card these
> > days that supports it.
>
> Yes, precisely.
>
> Though I'll point out that I bought a $25 VGA-to-S-video converter
> from monoprice.com a few months ago which was surprisingly good,
> considering that such things used to be in the hundreds. Just the
> cables alone that it comes with would cost you more than $25 from
> elsewhere. I wouldn't willingly use it instead of a direct connection
> from an S-Video output to an S-Video input (there are always going
> to be conversion losses, and this unit is no exception), but it's a
> reasonable choice for hooking a laptop up to an SD CRT. I can look up
> the monoprice part number if someone needs it and can't figure it out
> from their site. [It's USB-powered, so you get a VGA cable, an S-Video
> cable, a USB cable, a stereo RCA pair cable, and a little converter box
> that's about the size of a pack of playing cards. It'll also do VGA
> passthrough, IIRC. One gotcha---its little DIP switches come preset
> for PAL (!) output, and you have to look in the little booklet and
> flip one to get NTSC.]
Wow, this is a great discussion! To clear up some of the mystery, I
do have a CRT TV, and it's not likely I'll be getting a new TV anytime
soon. Thanks for all of the information about video cards and
converters. A VGA to S-Video converter would certainly be an option
if I got another video card, but I'm still holding onto the (fading)
hope that I won't need a new card.
The output to the TV isn't the problem, though. The errors occur
during recording, not playback. I did some more troubleshooting, and
I think the problem is strictly an issue with the PVR-350. I took
deleted the PVR-350 as a capture card in mythtv-setup and left the
PVR-150 as the only available input, then scheduled another program to
record, and the recording worked fine. No hardware lockups, crashes,
or mythbackend errors. So, using the PVR-150 as the only tuner might
be a workaround for now. I can't record two programs simultaneously
like I used to, but at least I can still record.
It might be feasible for me to get another tuner/encoder card for
input and a video card for output. Then I would be back to having two
tuners and one output, and if the tuner card has a hardware encoder
then I should be able to record two programs and watch another one at
the same time. The PVR-150 has a hardware encoder, but they stopped
making it long ago. Any suggestions for tuner cards (analog) with
hardware encoders?
As always, thanks for the responses!
- Dave
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