Greg Vickers wrote:
Bob wrote:
If you use hardware encoding capture cards (DVB-T does this, and
analogue capture cards like the PVR-250) you don't need a lot of CPU
for the capture of the video.
I believe the DVB cards actually don't do any encoding but neither do
they do any decoding, they just stream the compressed video feed they
pull of the air in whatever codec they receive it in (usually MPEG2),
but the result is the same, both the hardware encoders (Hauppauge PVR
cards) and the assorted digital TV cards place little demands on the
backend CPU.
So if I had a DVB card to receive digital free-to-air and a Hauppauge
350 to do the (analog) cable TV signal then the 350 would do the h/w
MPEG decoding for playback and I would probably be OK with a dual 450MHz
host, right? :P
Probably and if you have the hardware allredy it'll be fun finding out.
If the G4 is to be used as a frontend as well and CPU is a problem
then you could output through a PVR 350 card (as long as your not
planing to trascode stuff to MPEG4 for storage) or an nvidia card
using XvMC (particularly as some of the new GPUs allegedly have MPEG4
assistance) as both would assist with the decoding, but, I have *no*
idea if either would work in a PPC environment.
Transcoding is converting from MPEG2 to MPEG4, right? Won't the 350
decode both MPEG2 and MPEG4 streams for playback?
Not necessarily, transcoding is the process of changing the codec that
the video is stored with though in this case I was talking about from
MPEG2 -> MPEG4 and apparently the PVR 350 won't do MPEG4 playback.
http://www.gossamer-threads.com/lists/engine?list=mythtv&do=search_results&search_forum=all&search_string=pvr+350+mpeg4+playback&search_type=AND
There's an ATI rage
128 pro in there right now, I've got a Matrox G450 to drop in there as I
have the cable that will adapt the Matrox video display on the second
head to an S-video and composite display. Hmm, five minutes of tinkering
and the system won't give me any video with the Matrox in there... fell
at the first hurdle! I wonder if this converter cable will work with the
ATI card ...
>
Can you can schedule transcoding to be done when the system is idle?
i.e. when you are not watching 'live' TV through the system?
yes
So if I had the funds available, I could go out and get a DVB card, a
Hauppauge 350 and a video card with TV out and I'd be set with this dual
G4 450.
Or I could get a bigger CPU system and a DVB card and some other analog
card to capture the cable TV channel.
I'd get the DVB card and a PVR 500 or 150, then give it a go with your
current hardware, if you can't get it to work then get a new box and
transfer the cards over.
Oh yeah, we also have a 76 cm flat-screen CRT TV as well - will I have a
consideration when it comes to sample rate and subsequent playback rate
given a large TV?
Thanks,
--
tveeprom: Hauppauge: model = 34132, rev = J158,
tveeprom: tuner = Philips FM1236 MK3 (idx = 58, type = 4)
tveeprom: audio_processor = MSP3416 (type = 14)
(new type Model 401)
model name : mobile AMD Athlon(tm) XP Processor
cpu MHz : 2277.214
cache size : 512 KB
(Plenty o' grunt on an ECS k7s5a MB)
Knoppmyth R5A16 (unmodified)
http://mysettopbox.tv/CHANGELOG.txt
MythTV 0.18.1
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