Re: [mythtv-users] BT878 based DVB-T Cards
On Sun, Feb 20, 2005 at 02:28:15PM -, Neil Davidson wrote: > > Actually, I have no idea how big its buffer is, except to say that card > > has never given me any trouble whatsoever. Nor has the cx23883 so far. > > > > are the cx23883 cards easier to get working than the bt878 cards? I have a > Nebula that I've still not been able to get working in linux (could be that > i really don't have too much idea what i;m doing in linux yet though) Currently you need 2.6.10 + patches to get the cx23883 card working, so you probably need to compile your own kernel. Hamish -- Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
RE: [mythtv-users] BT878 based DVB-T Cards
> > > are the cx23883 cards easier to get working than the bt878 > > cards? I have a > > > Nebula that I've still not been able to get working in linux > > > (could be that > > > i really don't have too much idea what i;m doing in linux yet though) > > > > I use a Nebula without any problem. It is very sensitive to different > > kernel versions though. I use FC2 and have downloaded the 2.6.6 > > kernel. It > > took a lot of trial and error on the kernel version, but works > without too > > much effort once you get this right. > > > > > did you download and compile the kernel yourself or get an rpm? > > the whole recompiling kernel thing gets me nervous. > I built from source using a HOW-TO I googled for. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
RE: [mythtv-users] BT878 based DVB-T Cards
> > > are the cx23883 cards easier to get working than the bt878 > cards? I have a > > Nebula that I've still not been able to get working in linux > > (could be that > > i really don't have too much idea what i;m doing in linux yet though) > > I use a Nebula without any problem. It is very sensitive to different > kernel versions though. I use FC2 and have downloaded the 2.6.6 > kernel. It > took a lot of trial and error on the kernel version, but works without too > much effort once you get this right. > > did you download and compile the kernel yourself or get an rpm? the whole recompiling kernel thing gets me nervous. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
RE: [mythtv-users] BT878 based DVB-T Cards
> are the cx23883 cards easier to get working than the bt878 cards? I have a > Nebula that I've still not been able to get working in linux > (could be that > i really don't have too much idea what i;m doing in linux yet though) I use a Nebula without any problem. It is very sensitive to different kernel versions though. I use FC2 and have downloaded the 2.6.6 kernel. It took a lot of trial and error on the kernel version, but works without too much effort once you get this right. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
RE: [mythtv-users] BT878 based DVB-T Cards
> > > Judging by the traffic on linux-dvb, not many. In my system, I had the > > > Avermedia 761 card, a Nova-T clone and the onboard SATA controller all > > > on the same PCI bus, and it was unworkable. > > > > Did the Nova-T clone have a much larger buffer? > > Actually, I have no idea how big its buffer is, except to say that card > has never given me any trouble whatsoever. Nor has the cx23883 so far. > are the cx23883 cards easier to get working than the bt878 cards? I have a Nebula that I've still not been able to get working in linux (could be that i really don't have too much idea what i;m doing in linux yet though) ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] BT878 based DVB-T Cards
On Sun, Feb 20, 2005 at 11:08:14AM +, Mark Smith wrote: > In message <[EMAIL PROTECTED]> > Hamish Moffatt <[EMAIL PROTECTED]> wrote: > > > Judging by the traffic on linux-dvb, not many. In my system, I had the > > Avermedia 761 card, a Nova-T clone and the onboard SATA controller all > > on the same PCI bus, and it was unworkable. > > Did the Nova-T clone have a much larger buffer? Actually, I have no idea how big its buffer is, except to say that card has never given me any trouble whatsoever. Nor has the cx23883 so far. Hamish -- Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] BT878 based DVB-T Cards
In message <[EMAIL PROTECTED]> Hamish Moffatt <[EMAIL PROTECTED]> wrote: > Judging by the traffic on linux-dvb, not many. In my system, I had the > Avermedia 761 card, a Nova-T clone and the onboard SATA controller all > on the same PCI bus, and it was unworkable. Did the Nova-T clone have a much larger buffer? > Lower bit rates might be another reason why others are more successful. > In Australia we have QAM64 with either 2/3 or 3/4 FEC, leading to data > rates of ~19 or ~23 Mbit/sec. In the UK we have both QAM16 and QAM64 muxes, so I would expect the maximum bit rates to be much the same. -- Mark Smith - Surrey, UK http://www.chez-moi.org.uk/ ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] BT878 based DVB-T Cards
I wrote: > > > I wouldn't touch any DVB card based on the BT878 with a 40 foot barge > > > pole. See the linux-dvb archives for my reasons why. Both of these cards > > > use that chip; in general, the cheaper cards use it. > > What cards would you recomend then. The easily available ones in the UK are > BT878 based (Avermedia and Hauppauge). thanks. The latest Hauppauge Nova-T has a cx23883, which is fine. In Australia there are quite a few others available, such as the Korean-made KWorld XStream PCI (which I'm using without issue), DVICO FusionHDTV Plus, and Ultraview HDTV Plus (rebadge of DVICO FusionHDTV). Or DNTV Live from digitalnow.com.au. Avoid the FusionHDTV Lite or Ultravideo HDTV Lite, as they have the bt878. The FusionHDTV Plus or FusionHDTV (no suffix) are ok though. Both the Avermedia models (old 761 and new 771) have the bt878. Hamish -- Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] BT878 based DVB-T Cards
On Sat, Feb 19, 2005 at 11:31:25PM +, Mark Smith wrote: > In message <[EMAIL PROTECTED]> > Hamish Moffatt <[EMAIL PROTECTED]> wrote: > > > I wouldn't touch any DVB card based on the BT878 with a 40 foot barge > > pole. See the linux-dvb archives for my reasons why. Both of these cards > > use that chip; in general, the cheaper cards use it. [..] > This begs the question of how many people are actually seeing a problem as a > result of lack of buffer space on these cards, given the widespread > availability of cards based on this chipset. Judging by the traffic on linux-dvb, not many. In my system, I had the Avermedia 761 card, a Nova-T clone and the onboard SATA controller all on the same PCI bus, and it was unworkable. > I've seen various references to TS vs PS mode, but not sure quite how this > all works as yet. Is the entire mux data stream read across the PCI bus in > the former case? If so, is this contributing to the problem? There's no hardware filtering in either mode (I'm using PS mode). In all cases the entire mux data (up to 23Mbit/sec in Australia with QAM64). Lower bit rates might be another reason why others are more successful. In Australia we have QAM64 with either 2/3 or 3/4 FEC, leading to data rates of ~19 or ~23 Mbit/sec. Hamish -- Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
RE: [mythtv-users] BT878 based DVB-T Cards
> > I wouldn't touch any DVB card based on the BT878 with a 40 foot barge > > pole. See the linux-dvb archives for my reasons why. Both of these cards > > use that chip; in general, the cheaper cards use it. > > > > I'd be particularly concerned about using two of them in the same > > system. The problem is that they don't have enough on-board buffer space > > to cope with any other traffic on the PCI bus. > > > > For me, the Avermedia card plus the SATA controller on the same PCI bus > > was too much. Two of these cards may be too much for your system, > > especially if you have any other stuff on the bus. > > This begs the question of how many people are actually seeing a > problem as a > result of lack of buffer space on these cards, given the widespread > availability of cards based on this chipset. > > I've seen various references to TS vs PS mode, but not sure quite how this > all works as yet. Is the entire mux data stream read across the PCI bus in > the former case? If so, is this contributing to the problem? > What cards would you recomend then. The easily available ones in the UK are BT878 based (Avermedia and Hauppauge). thanks. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
