Re: [mythtv-users] Slowest processor for software HDTV decoding
Seth Heckard wrote: I know there has been a lot of discussions here lately about HDTV decoding and processor speeds and such, however I get the feeling that the recommended 3GHz P4 spec is a little overkill. There is a reason why it is recommend. Basically, I am asking for the slowest (and theroretically cheapest) processor that can decode all HD formats, and ideally have headroom left over for things like commercial flagging and deinterlacing if required. I could care less about P4 vs. Celeron vs. AMD64 as long as it gets the job done. For the sake of argument, assume that a Nvidia FX 5200 will be used with DVI output and no XvMC. From my personal experience, a 3GHz P4. Regards, Cecil ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Slowest processor for software HDTV decoding
On 4/28/05, Cecil Watson [EMAIL PROTECTED] wrote: Seth Heckard wrote:I know there has been a lot of discussions here lately about HDTVdecoding and processor speeds and such, however I get the feeling thatthe recommended 3GHz P4 spec is a little overkill. There is a reason why it is recommend.Basically, I am asking for the slowest (and theroretically cheapest)processor that can decode all HD formats, and ideally have headroom left over for things like commercial flagging and deinterlacing ifrequired.I could care less about P4 vs. Celeron vs. AMD64 as long asit gets the job done.For the sake of argument, assume that a Nvidia FX 5200 will be used with DVI output and no XvMC. From my personal experience, a 3GHz P4.Regards,Cecil I'm getting good results from an AMD64 3000 with 512 Megs and one HDTV card. Video card is a 5200. I don't need to bother with XvMC. The system is rock stable. Transcoding jobs are custom script cronned in the wee small hours. Fry's had the ASUS mobo and processor together on offer for $230. That should be cheap enough for anyone. ___mythtv-users mailing list mythtv-users@mythtv.orghttp://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
[mythtv-users] Slowest processor for software HDTV decoding
I know there has been a lot of discussions here lately about HDTV decoding and processor speeds and such, however I get the feeling that the recommended 3GHz P4 spec is a little overkill. Basically, I am asking for the slowest (and theroretically cheapest) processor that can decode all HD formats, and ideally have headroom left over for things like commercial flagging and deinterlacing if required. I could care less about P4 vs. Celeron vs. AMD64 as long as it gets the job done. For the sake of argument, assume that a Nvidia FX 5200 will be used with DVI output and no XvMC. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Slowest processor for software HDTV decoding
Seth Heckard wrote: I know there has been a lot of discussions here lately about HDTV decoding and processor speeds and such, however I get the feeling that the recommended 3GHz P4 spec is a little overkill. Basically, I am asking for the slowest (and theroretically cheapest) processor that can decode all HD formats, and ideally have headroom left over for things like commercial flagging and deinterlacing if required. I could care less about P4 vs. Celeron vs. AMD64 as long as it gets the job done. For the sake of argument, assume that a Nvidia FX 5200 will be used with DVI output and no XvMC. I cant say what the lowest is, but I can tell ya what I use, which from what I remember, was on the lower end of the spectrum for CPUs decoding HD. AMD XP2100+ 768 MB RAM I dont use XVMC, but I do use libmpeg2. Tom ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Slowest processor for software HDTV decoding
On 4/27/05, Joe Barnhart [EMAIL PROTECTED] wrote: I think you also have to specify the final output size. I get the impression that 1280x720p output is easier than 1920x1080i. Note, the SOURCE material could be in either format, but the size of the DISPLAY resolution is what I'm talking about here (i.e. the modeline you're using). Ideally it would be at the native resolution (my TV has HDMI in so a 720p or 1080i resolution would be preferable, although 720p would be upconverted on the TV), but I haven't had any luck with 1080i modelines with the nvidia drivers. I use a 1080i modeline and I could not use an Athlon XP 2800 and get satisfactory output. I had to go to a 3GHz P4 with hyperthreading to get the headroom you speak of. (Recently I discovered that 512M wasn't enough, either. I have two HD-3000 cards, and comm flagging was killing me at 512M.) Interesting. I had pretty much ruled out an Athlon XP, although I would prefer to go that route if it could work as well. I can't ever see myself getting dual HDTV cards though, I barely use the dual tuners I have now simultaneously. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Slowest processor for software HDTV decoding
On Wed, Apr 27, 2005 at 05:45:41PM -0700, Joe Barnhart wrote: --- Seth Heckard [EMAIL PROTECTED] wrote: Basically, I am asking for the slowest (and theroretically cheapest) processor that can decode all HD formats, and ideally have headroom left over for things like commercial flagging and deinterlacing if required. I think you also have to specify the final output size. I get the impression that 1280x720p output is easier than 1920x1080i. Note, the SOURCE material could be in either format, but the size of the DISPLAY resolution is what I'm talking about here (i.e. the modeline you're using). Actually, the final output size is not too important. it's the size of the HD recording that matters (either 1920x1080 or 1280x720). Your screen might run at a different size (mine I run at 1280x720 because that is the native resolution of the DLP in it.) The downscale from 1080i to that size is done in hardware by xvideo, and does not affect the CPU. So if you you want to play HDTV, your choices are to get enough CPU to play both (or, in the extreme, downrez all the 1080i down to 720 lines, which will take a long time if your CPU can only do 720.) However, you don't want the slowest CPU that can do the job. If you max out your CPU, you will regret it, because anything else using CPU on the system will make your video skip. Even the fastest systems get (rare) video skips from time to time when something fires up on them that eats CPU, even when niced like a commercial flag. The issue, once you hit the minimum, is how resiliant you want it to be. I use a 1080i modeline and I could not use an Athlon XP 2800 and get satisfactory output. I had to go to a 3GHz P4 with hyperthreading to get the headroom you speak of. (Recently I discovered that 512M wasn't enough, either. I have two HD-3000 cards, and comm flagging was killing me at 512M.) Some people are reporting ok playback on systems like a 2.4ghz. I recommend spending a few extra bucks and going higher. Some claim to have gone even lower, at least for 720p. Of course, if you use xvmc, you can get by with much less. Note that xvmc can't help you with mp4 at this time, if you do plan to transcode. ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
