I'm not actively looking at it. I did take a quick look but my suspicion was wrong. Can you attach the patch the Ian sent you to the bug report, it may just point me at something. I haven't forgotten about it just way too busy and trying to get some other stuff finished first.
John > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:ivtv-devel- > [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > Sent: 09 January 2006 03:51 > To: [email protected] > Subject: [ivtv-devel] Dropped Frames bug (#55) - anyone investigating? > > Out of personal greed, selfishness, etc., I wonder if > anyone is working on trac bug #55 (XV/YUV video output > on PVR 350 drops frames while encoder is encoding). > > I was the one who submitted the bug report. I sure > wish I had the ability to go in and debug the issue > myself, but it's way over my head. I suspect John > Harvey would like to work on it (he said he had some > ideas as to the causes) but he may be too busy with > other stuff. Also, Ian Armstrong once sent me a patch > to test, which indicated to me he was on the right > track. The reason I say this is that the result of > testing the patch was much less frequent frame > dropping but more frames dropped when they did > (leading to a bigger visual "jerk" effect, like 4-6 > frames dropped every 2 seconds or so). The frame drop > rates are all eyeball estimates. (Also Ian's comments > seemed to indicate this is a problem only in > NTSC-land.) > > Any chance for someone to put some bandwidth on it? > Is there anything I can do to help? (I'm not sure > there's anything more than testing that I can offer.) > > A brief description: when using the xv output on the > 350 to display video, while the encoder is encoding, I > get 1-2 dropped frames per second, seemingly randomly > placed. (E.g. 2 dropped frames the first second, 1 > dropped frame the next second, then 0, then 4, then 1, > etc.) The data coming in from the encoder is fine (as > determined by later viewing the same data while the > encoder is off) so it has something to do with the > xv/yuv output. It appears to be unrelated to system > load, as I get it with both high and low load. I'm > getting this on a P4 2.4GHz system with 1G RAM, > running kernel 2.6.8. Of course, the dropped frames > are ocurring even if I'm watching an already recorded > video while a separate video is being stored from the > encoder. > > I'm using the xv driver 0.10.6, and ivtv 0.4.1. FWIW > I use mythtv 0.18.1-fixes. > > It seems to me it is related to some kind of collision > between the input and output on the PCI bus from the > one PVR 350. It might be only NTSC-related (I am in > the US). No errors of any kind appear in any of the > logs. > > I should add that I use the xv/yuv output because that > way I can transcode my recordings to mpeg4 and save a > lot of disk space (as well as watch dvds and other > videos, etc.) > > Another thing: is there anyone else who sees this (or, > doesn't, under circumstances that are similar to > mine)? > > Thanks! > > _______________________________________________ > 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
