On Mon, 2009-03-23 at 06:52 -0700, Corey Taylor wrote: > > Andy, > > > I am noticing an improvement in pixelation by setting the bufsize to > > 64k. I will monitor over the next week and report back. I am running 3 > > HVR-1600s and the IRQs are coming up shared with the USB which also > > supports my HD PVR capture device. Monday nights are usually one of > > the busier nights for recording so I will know how well this holds up. > > > Thanks for the tip! > > > Brandon > > Hi Andy and Brandon, I too tried various different bufsizes as suggested and > I still see very noticeable pixelation/tearing regardless of the setting. > > I even upgraded my motherboard this past weekend to an Asus AM2+ board with > Phenon II X3 CPU. Still the same problems with the card in a brand new > setup. > > I also tried modifying the cx18 source code as Andy suggested and that > made more debug warning show up in my syslog, but still did not > resolve the issue. Haven't tried this yet with the new motherboard > though. > > Is it possible that this card is more sensitive to hiccups in the > signal coming from the cable line? Or interference from other close-by > cables and electronic equipment? > > When recording/watching Live TV through MythTV, I see that ffmpeg is > constantly outputting various errors related to the video stream. I > can post those here if you think it's relevant. > > Shoud I just return this card and get one with a different chipset? Or > do you think driver updates can solve the issue? > > I'm happy to hold on to this card if it means I can contribute in some > way to fixing the problem, if it's fixable : )
Corey and Brandon, I found a race condition between the cx driver and the CX23418 firmware. I have a patch that mitigates the problem here: http://linuxtv.org/hg/~awalls/cx18/rev/9f5f44e0ce6c I think the final form of the patch could be better. However, this patch essentially eliminated any artifacts I was getting playing back digital TV. I also had positive results running mplayer without the "-cache" command line for both digital and analog captures. I haven't tested on a single processor machine, nor in a multicard setup, but things looked good enough that I thought it ready for test by others. Let me know if it helps or not. Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
