Just want to throw a 'me too' out on this one. I grabbed 3.8 and i get strange periods of dropped frames, like it's in 'fast forward' mode. it is not a playback issue, the frames are dropped in the recording
This usually happens within 30 seconds of the begining of the recording, and randomly during it. It can last anywhere from 5 to 20 seconds in my experience. anyhow, i'm eager to hear about the fix too :) -tmk --- Leonard Orb <[EMAIL PROTECTED]> wrote: > Hi all, > > after installing an additional dvb-t card in a > system with two pvr 250 > that worked absolutely wonderful for months with > 0.2.0-rc3f i had to > upgrade the kernel from 2.4.31 to 2.6.12.6 to get > the dvb-t working. > > I tried to install 0.2.0-rc3k, but there were probs > with the cx88xx > module, needed for the dvb-t, because of missing > symbols in > tveeprom.ko. > > Then i gave a try to 0.3.8, and installation was > smooth and worked > fine, except one problem: Recordings using the pvr > 250s show mpeg > artifacts, sound drop outs and sometimes even the > video steps, i.e. > some tenths of a second simply are missing. This > happens not very > often, about every ten or fifteen minutes i guess. > Sometimes it > happens more frequently and sometimes it does not > happen at all for an > hour or so. > > It seems that other system activities, esp. hard > disc access, would > increase the problem. Playing with buffer sizes did > not help. > First i tried "modprobe ivtv yuv_buffers=4 > mpg_buffers=8 vbi_buffers=4 > pcm_buffers=4" to have all these buffers doubled > compared to the > defaults, then i tried "modprobe ivtv yuv_buffers=1 > mpg_buffers=2 > vbi_buffers=1 pcm_buffers=1", which gives half the > sizes, but there > was no alleviation. > > Then i came back to 0.2.0-rc3k yesterday and bravely > used tveeprom > from the kernel, not the version included in ivtv, > so there are no > unresolved symbols anymore and surprisingly both pvr > 250s and the > dvb-t card work fine now (and i am satisfied, no > probs for me now). > > But it is obvious that something in 0.3.8 has > changed compared to the > 0.2.0 versions that causes recording problems. > > Some background information: > I tune with ptune.pl and I use ivtvctl to set > bitrate, dnr_mode, > stream_type and such. I then "cat /dev/videoX > > <file>". No other > software does interfere with ivtv, there is only the > kernel, ivtv and > cron. > > The box is an AMD Athlon 2200+ on a Gigabyte > 7n400s-l mobo with > 512mb ram. There are three ata hard disks connected. > Hda is an old > IBM DTLA with 40gb, hdb is a quite new IBM 250gb and > hdc is a Maxtor > 250gb. The Maxtor is the recording disk and is only > used for recording > and playback. The system is a combined dsl network > firewall and digital > video recorder, and there are no other system > activities. > When recording two 8mbit/s video streams with both > pvr simultanously > the system load is 0.15 to 0.20, and with ivtv > 0.2.0-rc3f and 2.4.31 > installed i would see no video degradation even if i > started to copy 10gb > from hdc to hdb while these two recordings were > running. > > The problem started when i installed 0.3.8 and it > disappeared after i left > 0.3.8 behind and installed 0.2.0-rc3k, so i do not > think it has to do > anything with the dvb-t card. It is possible to do > two 8mbit/s recordings > with the pvrs and a third 2.2mbit/s recording with > the dvb-t at the same > time without any quality degradations. > > Finally i should mention that i never used any 0.3.x > version before, > because there were no problems with the 0.2.0 > versions i have had. > > A big "Thank you" to Chris Kennedy and all others > involved in > development, this is great stuff :-) > > Best regards > Leo > > > ------------------------------------------------------- > SF.Net email is Sponsored by the Better Software > Conference & EXPO > September 19-22, 2005 * San Francisco, CA * > Development Lifecycle Practices > Agile & Plan-Driven Development * Managing Projects > & Teams * Testing & QA > Security * Process Improvement & Measurement * > http://www.sqe.com/bsce5sf > _______________________________________________ > ivtv-devel mailing list > ivtv-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ivtv-devel > ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ ivtv-devel mailing list ivtv-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ivtv-devel
