[mythtv-users] numerous newbie questions
Michael T. Dean
mtdean at thirdcontact.com
Fri May 27 06:55:08 UTC 2005
Peter T. Abplanalp wrote:
>hi all. i have been interested in setting up a myth box for
>quite some time but as i've seen a number of people do, i
>wanted to kick the tires a bit. that being the case, i went
>out and bought a ati tv wonder pro card, put it in my p2 450
>mhz box, installed a fresh fedora core 3 and followed
>jarod's howto. well, i got everything pretty much done but
>i am having some issues.
>at first i set up my card as an mpeg2 card because i thought
>it did onboard mpeg2 encoding but that gave me ivtv codec
>errors. i checked the list and found that this could mean i
>had a v4l card so i changed my setup and now i get live tv
>but it is very jerky and my cpu is maxed. i think this
>means that my cpu is doing the encoding/decoding and can't
>keep up. is that true? does anyone know if the ati wonder
>pro does onboard encoding and if so, how do i get that
No. It's a frame grabber. Requires software encoding, so your P2/450
is a bit underpowered.
>so, eventhough i don't have a setup that is working very
>well, i've decided to take the plunge. it looks from my
>reading that most people use the pvr-250/350. i believe the
>difference is that with the 250 you need to plug the audio
>out of the card into the audio in of the sound card and with
>the 350 you don't. is this true and if so, why?
Vice versa. If you use TV out from the PVR-350, TV audio is also output
by the PVR-350. Since any sound that comes from anything other than
MPEG-2 (PVR-x50) recordings comes out the sound card and the sound from
recordings comes out the PVR-350, routing the PVR-350's output into the
sound card allows you to hear TV, videos, music, etc. with a single
output to your speakers/audio receiver.
The PVR-250 does not have any outputs--only inputs. With it, you do
software decoding and output using your video card and sound card.
>my next question is about video. from what i understand,
>the video comes in via the cable, into the tv card, from
>there it gets processed/buffered and sent out via the
>graphics card. is that accurate? is the graphics card an
>absolute necessity? do i need to look for a graphics card
>with some sort of "normal" video out like s-video or
If you get a PVR-350, you don't need a video card with TV out. (Also,
if you don't upgrade your CPU, you'll probably want to go with the
PVR-350, but as a PVR-350 owner who's not using PVR-350 TV out because
of its shortcomings, I would recommend you instead spend the extra money
you would have spent on the 350 to buy a better CPU/motherboard/video
card. It's far more useful because of commercial flagging, transcoding,
etc. Plus with a good video card, you can get OpenGL and hardware
acceleration of the video--for MythMusic, MythGallery, MythGame, etc.)
>actually, can someone please explain how the video and audio
>is handled? specifically, how do things need to be wired to
>and from the computer.
Depends on what you're hooking up--analog cable, digital cable with
serial control, digital cable with IR control, digital cable with
firewire, satellite with serial control, satellite with IR control, ...
>finally, the video is pretty awful when viewed on the
>screen. why might that be?
P2/450 and a frame grabber instead of a hardware encoder. Might also be
a bad choice of resolution/bitrate, but you should probably focus on the
encoding problem first (i.e. either get a hardware encoder, a better
CPU/motherboard, or--better yet--both).
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