Re: [mythtv-users] Where's the playback bottleneck?
On 1/24/06, Kevin Kuphal <[EMAIL PROTECTED]> wrote: > Jerry Rubinow wrote: > > On 1/24/06, Robert Johnston <[EMAIL PROTECTED]> wrote: > > > >> On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > >> > >>> If I playback an HD resolution file, I get stuttering, pick a codec, any > >>> codec. > >>> > >>> If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > >>> If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > >>> pretty much ok. > >>> > >>> In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > >>> a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > >>> using a PCI FX5200). > >>> > >>> The fact that I can playback the file in mplayer with xvmc, tells me > >>> it's not a disk issue, and the fact that mplayer cannot play it back > >>> smoothly with xv tells me it's probably not a myth issue. > >>> > >>> Is it a bandwidth problem in the video card or the bus? Some BIOS > >>> setting incorrect? Does anyone have any suggestions for how to narrow > >>> it down and tell for sure where the problem might be? > >>> > >>> Is anyone using an original (sis-based) Pundit for HD playback > >>> successfully? > >>> > >> If you can play back using mplayer (and XvMC), it means you can enable > >> XvMC in Myth and have smooth HDTV playback. > >> -- > >> Robert "Anaerin" Johnston > >> > > > > Theoretically, yes, but I've tried many different combinations of > > options (vsync, vblank, audio buffering, etc) and it's just not quite > > good enough for useability. Sometimes I get a lockup when starting to > > play, sometimes it gets a stutter, sometimes it gets out of sync with > > sound. Nothing consistent, but perhaps indicative of getting near the > > same bandwidth limit I'm hitting consistently without xvmc. > > > What video card and driver version? > > I have trouble with anything other than Nvidia 7676 > > Kevin That is, in fact, the very one I'm using (though I've tried a bunch of others). ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
On 1/24/06, John P Poet <[EMAIL PROTECTED]> wrote: > On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > > If I playback an HD resolution file, I get stuttering, pick a codec, any > > codec. > > > > If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > > If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > > pretty much ok. > > > > In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > > a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > > using a PCI FX5200). > > > > The fact that I can playback the file in mplayer with xvmc, tells me > > it's not a disk issue, and the fact that mplayer cannot play it back > > smoothly with xv tells me it's probably not a myth issue. > > > > Is it a bandwidth problem in the video card or the bus? Some BIOS > > setting incorrect? Does anyone have any suggestions for how to narrow > > it down and tell for sure where the problem might be? > > > > Is anyone using an original (sis-based) Pundit for HD playback successfully? > > > > Thanks. > > > > -Jerry > > I have never tried it myself, but I remember a discussion about a year > ago which came to the conclusion that a PCI based video card did not > have enough bandwidth for HD. > > John John, your memory serves you correctly, thanks. Here: http://www.gossamer-threads.com/lists/mythtv/users/122696?search_string=hd%20pci%20bandwidth;#122696 I found this quote, attributed to the DScaler people: "PCI can reliably continuously transfer up to about 600-700 megabits per second *in one direction only* out of a possible 1056 megabits per second (132 megabytes per second) due to overhead." 1280x720x24bits (or is it 24 bits plus 8 for alpha? Anyone know what's being send to the video card?) = ~22Mbits, at 30 frames a second, that's 660Mbits/sec, which means I'm probably bumping up against that limit every time something decides to do something on the bus. So basically, I'm screwed and stuck with some useless hardware. Or, more positively, this means I have no choice but to go and buy more stuff to build the even greater frontend that will come after and finally answer the question. Surely the wife will see the logic in this. If anyone sees any flaws in my calculations, now's the time to speak up, before I spend a bunch of money I don't have to. -Jerry ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
On 1/24/06, Steve Adeff <[EMAIL PROTECTED]> wrote: > On Tuesday 24 January 2006 20:31, Robert Johnston wrote: > > On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > > > If I playback an HD resolution file, I get stuttering, pick a codec, any > > > codec. > > > > > > If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > > > If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > > > pretty much ok. > > > > > > In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > > > a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > > > using a PCI FX5200). > > > > > > The fact that I can playback the file in mplayer with xvmc, tells me > > > it's not a disk issue, and the fact that mplayer cannot play it back > > > smoothly with xv tells me it's probably not a myth issue. > > > > > > Is it a bandwidth problem in the video card or the bus? Some BIOS > > > setting incorrect? Does anyone have any suggestions for how to narrow > > > it down and tell for sure where the problem might be? > > > > > > Is anyone using an original (sis-based) Pundit for HD playback > > > successfully? > > > > If you can play back using mplayer (and XvMC), it means you can enable > > XvMC in Myth and have smooth HDTV playback. > > other than that it sounds like a CPU speed issue. > > -- > Steve I don't understand how it could be a CPU speed issue if usage if below 50%. -Jerry ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
Jerry Rubinow wrote: > On 1/24/06, Robert Johnston <[EMAIL PROTECTED]> wrote: > >> On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: >> >>> If I playback an HD resolution file, I get stuttering, pick a codec, any >>> codec. >>> >>> If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. >>> If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back >>> pretty much ok. >>> >>> In all cases, myth and mplayer, CPU is between 20% and 50% (this is on >>> a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, >>> using a PCI FX5200). >>> >>> The fact that I can playback the file in mplayer with xvmc, tells me >>> it's not a disk issue, and the fact that mplayer cannot play it back >>> smoothly with xv tells me it's probably not a myth issue. >>> >>> Is it a bandwidth problem in the video card or the bus? Some BIOS >>> setting incorrect? Does anyone have any suggestions for how to narrow >>> it down and tell for sure where the problem might be? >>> >>> Is anyone using an original (sis-based) Pundit for HD playback successfully? >>> >> If you can play back using mplayer (and XvMC), it means you can enable >> XvMC in Myth and have smooth HDTV playback. >> -- >> Robert "Anaerin" Johnston >> > > Theoretically, yes, but I've tried many different combinations of > options (vsync, vblank, audio buffering, etc) and it's just not quite > good enough for useability. Sometimes I get a lockup when starting to > play, sometimes it gets a stutter, sometimes it gets out of sync with > sound. Nothing consistent, but perhaps indicative of getting near the > same bandwidth limit I'm hitting consistently without xvmc. > What video card and driver version? I have trouble with anything other than Nvidia 7676 Kevin ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
On Tuesday 24 January 2006 20:31, Robert Johnston wrote: > On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > > If I playback an HD resolution file, I get stuttering, pick a codec, any > > codec. > > > > If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > > If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > > pretty much ok. > > > > In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > > a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > > using a PCI FX5200). > > > > The fact that I can playback the file in mplayer with xvmc, tells me > > it's not a disk issue, and the fact that mplayer cannot play it back > > smoothly with xv tells me it's probably not a myth issue. > > > > Is it a bandwidth problem in the video card or the bus? Some BIOS > > setting incorrect? Does anyone have any suggestions for how to narrow > > it down and tell for sure where the problem might be? > > > > Is anyone using an original (sis-based) Pundit for HD playback > > successfully? > > If you can play back using mplayer (and XvMC), it means you can enable > XvMC in Myth and have smooth HDTV playback. other than that it sounds like a CPU speed issue. -- Steve ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
On 1/24/06, Robert Johnston <[EMAIL PROTECTED]> wrote: > On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > > If I playback an HD resolution file, I get stuttering, pick a codec, any > > codec. > > > > If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > > If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > > pretty much ok. > > > > In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > > a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > > using a PCI FX5200). > > > > The fact that I can playback the file in mplayer with xvmc, tells me > > it's not a disk issue, and the fact that mplayer cannot play it back > > smoothly with xv tells me it's probably not a myth issue. > > > > Is it a bandwidth problem in the video card or the bus? Some BIOS > > setting incorrect? Does anyone have any suggestions for how to narrow > > it down and tell for sure where the problem might be? > > > > Is anyone using an original (sis-based) Pundit for HD playback successfully? > > If you can play back using mplayer (and XvMC), it means you can enable > XvMC in Myth and have smooth HDTV playback. > -- > Robert "Anaerin" Johnston Theoretically, yes, but I've tried many different combinations of options (vsync, vblank, audio buffering, etc) and it's just not quite good enough for useability. Sometimes I get a lockup when starting to play, sometimes it gets a stutter, sometimes it gets out of sync with sound. Nothing consistent, but perhaps indicative of getting near the same bandwidth limit I'm hitting consistently without xvmc. Am I correct in assuming that less data is going to the video card when using xvmc? Anyone know the data ratio of xvmc vs. non-xvmc? -Jerry ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > If I playback an HD resolution file, I get stuttering, pick a codec, any > codec. > > If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > pretty much ok. > > In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > using a PCI FX5200). > > The fact that I can playback the file in mplayer with xvmc, tells me > it's not a disk issue, and the fact that mplayer cannot play it back > smoothly with xv tells me it's probably not a myth issue. > > Is it a bandwidth problem in the video card or the bus? Some BIOS > setting incorrect? Does anyone have any suggestions for how to narrow > it down and tell for sure where the problem might be? > > Is anyone using an original (sis-based) Pundit for HD playback successfully? > > Thanks. > > -Jerry I have never tried it myself, but I remember a discussion about a year ago which came to the conclusion that a PCI based video card did not have enough bandwidth for HD. John ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
Re: [mythtv-users] Where's the playback bottleneck?
On 1/24/06, Jerry Rubinow <[EMAIL PROTECTED]> wrote: > If I playback an HD resolution file, I get stuttering, pick a codec, any > codec. > > If I play it back with mplayer (-vo xv -vc ffmpeg12), also stuttering. > If I play it back with mplayer (-vo xvmc -vc ffmpeg12mc), plays back > pretty much ok. > > In all cases, myth and mplayer, CPU is between 20% and 50% (this is on > a combined front/backend, P4 2.8 Pundit, with onboard VGA disabled, > using a PCI FX5200). > > The fact that I can playback the file in mplayer with xvmc, tells me > it's not a disk issue, and the fact that mplayer cannot play it back > smoothly with xv tells me it's probably not a myth issue. > > Is it a bandwidth problem in the video card or the bus? Some BIOS > setting incorrect? Does anyone have any suggestions for how to narrow > it down and tell for sure where the problem might be? > > Is anyone using an original (sis-based) Pundit for HD playback successfully? If you can play back using mplayer (and XvMC), it means you can enable XvMC in Myth and have smooth HDTV playback. -- Robert "Anaerin" Johnston ___ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
