On Wed, 2008-02-20 at 21:45 +0100, Hans Verkuil wrote: > On Wednesday 06 February 2008 08:24:07 Levente Novák wrote: > > This is something I do not quite understand: why is the temporal > > filter set initially to 8, since this produces ghosting and jerky > > movement most of the time? Setting it to 0 (or to 1-4) produces far > > better results for me, but judging from the freevo as well as other > > mailing lists most people do likewise. > > This value was copied from the Windows driver and I've never seen > problems with it (at least not with PAL), provided you capture at full > resolution (720x480/576). If you capture at less than the full > resolution, then the temporal filter should be set to 0. Some older > kernels did not do this which led to ghosting, but anything after > 2.6.20 or so should work well. >
Unfortunately on my box the ghosting is very noticeable (to me at least, maybe I'm too sensitive to it). This phenomenon is better described as a "sticky movement": when an actor stays quiet for a longer time then all of a sudden he begins to move, his head or body seems to "stick" to the place he was at before for a fraction of a second. But this prevents a really smooth perception of motion. Also, I don't quite understand why it would work with a value of 8 at full PAL resolution but not at lower res. Something in relation to scaling? For sure it is also perceived by other people, since the Freevo config file suggests to set the temporal filter to 0 (for full PAL also). When playing around with the filter, the more high it is set to, the more pronounced the effect is. Regards, Levente _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
