I am bit on the shaky grounds here, since i don't know what is acutally happening...
Couldn't you do it by just using frames to fields and reframe plugins? (btw: i think the thing you want to do qualifies for needing a separate rendering step ... to be easily able to work with footage that you got this way...) bye andraz On pon, 2006-05-29 at 12:11 -0400, Joe Stewart wrote: > I wanted to duplicate the slo-mo effect described in > http://rarevision.com/articles/slow_motion.php but couldn't figure out a way > to do it in Cinelerra without requiring a render and reimport. > > Using the frames-to-fields plugin and interlaced material, you can get smooth > 50% slow motion if you set your asset frame rate to 15fps and project to > 30fps. Theoretically you could set the project frame rate higher to get more > of a slowdown, but it doesn't help if you want to render at 24fps. And it > isn't smooth. > > In order to make the effect work in a single render, I added a new frame rate > to the asset list - 9.6 fps (40% of 24fps). I then added a pulldown to the > frames-to-fields plugin that lets you tell the plugin what frame rate the > asset is set to. It uses this frame rate for the call to read_frame instead > of simply dividing the project frame rate in half like it does now > > This way you can specify a frame rate of 9.6 in the asset and 24fps in the > project, which gets you the equivalent of 60i->24p in a nice, smooth 40% > slow-motion. > > Example clip rendered with Cinelerra with modified frames-to-fields plugin: > http://www.joestewart.org/slomo.mov > > Now, I will concede that setting the asset frame rate in two different places > may not be the best way to go about this. Ideally the plugin would detect the > asset frame rate and use it - however, I see no way for plugins to access > asset attributes without changes to the plugin API - and, if that were to > happen, would would occur if the plugin spans multiple assets? Might get > messy. > > If this patch isn't desirable, I'm open to suggestions. > > -Joe _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
