It seems to be related to timing rather than load or throughput as I don't see any DMA or application frame-drop errors. Do you think it might be a firmware or hardware issue?
If not, I'm willing to look deeper... If you have any pointers to where it might be and/or debugging options that might help to isolate it, I'd be grateful. It's 100% reproducible on my system. Thanks, Wilf. On 11/03/06, John Harvey <[EMAIL PROTECTED]> wrote: > I had a quick look back then but what I thought was the cause wasn't so I > currently have no ideas and even less time to look at it. > > Sorry > John > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Graeme Wilford > > Sent: 10 March 2006 22:41 > > To: Discussion list for development of the IVTV driver > > Subject: Re: [ivtv-devel] The xdriver/xv drama (stutter) > > > > I also see the stuttering but only when the MPEG coder is > > running simultaneously. > > > > Without the coder running, DVD playback via Xv is perfect but > > unfortunately with it running, playback is unwatchable. > > > > IIRC, John Harvey thought he knew what was causing this back > > in October last year but I don't think he's had time to work > > on it since... > > > > Regards, > > Wilf. > > > > On 25/02/06, bbee <[EMAIL PROTECTED]> wrote: > > > Hi all, > > > > > > I recently bumped my PVR350 box from a old 0.1.9 ivtv / old > > 2.6 kernel > > > to the 0.4.2 release and 2.6.14 kernel (gentoo hardened-sources, > > > fwiw). Also now using the 0.10.6 xdriver. > > > > > > After some fudging the non-xvideo ivtv stuff works as > > perfectly as the > > > old release, but I'm having trouble getting smooth playback > > using the > > > xv output. > > > The symptom is a "stuttering" of the video feed; every 1~2 seconds > > > (the interval does not change, regardless of motion) the > > video seems > > > to pause for a few frames before resuming. From what I can > > observe no > > > frames are dropped, it is just a short (but very annoying) periodic > > > playback pause. > > > This is on a PAL board using mplayer dev-CVS-060217 (from gentoo > > > portage) on a Epia V8000 board (800 MHz). The CPU never > > goes above 50% > > > and mplayer does not complain about my system being too slow. > > > > > > The last mention of issues like this that I can find is this thread: > > > http://www.gossamer-threads.com/lists/ivtv/devel/23811 > > > >From September '05. Now I've tried the suggestions in the thread > > > (increasing YUV buffers), I've tried most other patches that seemed > > > promising from the lists, I've tried recompiling the xdriver with > > > optimizations, I've tried eliminating any audio issues (-ao null), > > > I've tried about 30 different video files of differing > > resolutions and > > > encodings. I've tried all I can think of. The problem persists. > > > > > > The reason I call this a drama is that, apart from the > > stuttering, the > > > video output is the most drop-dead gorgeous TVout I have > > ever seen. I > > > swear if I ripped a DVD to CD size, downsampling the > > resolution, the > > > rip played through xv would look better than if I played > > the DVD on my standalone. > > > > > > Using the X11 output (-vo x11) gives the old familiar > > tearing when a > > > lot of the frame changes, as well as unscaled output, and slightly > > > higher CPU usage. But no stutter. I believe the cause is > > somewhere in > > > the IVTV yuv playback code. > > > > > > Now, I'd been waiting for a major mythtv release to upgrade this > > > system. I was hoping ivtv would be able to facilitate > > smooth video playback by then. > > > Not to diminish all the hard work by the developers, but is there > > > anything I can do to make this happen? If not, is there atleast any > > > notion of what the problem is / the timeframe to resolve > > it? (Are all > > > the devs busy merging with DVB / mainline kernel?) Or should I just > > > give up and switch to the EPIA's builtin, exceedingly crappy, but > > > accelerated and non-stuttering Trident Cryberblade/il TVout? > > > > > > Thanks, > > > > > > bbee > > > > > > _______________________________________________ > > > ivtv-devel mailing list > > > [email protected] > > > http://ivtvdriver.org/mailman/listinfo/ivtv-devel > > > > > > > -- > > [EMAIL PROTECTED] | MythTV blog: http://mezzanines.blogspot.com/ > > > > _______________________________________________ > > ivtv-devel mailing list > > [email protected] > > http://ivtvdriver.org/mailman/listinfo/ivtv-devel > > > _______________________________________________ > ivtv-devel mailing list > [email protected] > http://ivtvdriver.org/mailman/listinfo/ivtv-devel > -- [EMAIL PROTECTED] | MythTV blog: http://mezzanines.blogspot.com/ _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
