hi folks, maybe not a cinelerra problem in the strictest sense, however maybe someone here can hint me where to look.
i have made a movie on dvd using kino (for grabbing), cinelerra (for editing and rendering to q4l.mov), tovid (for converting to dvd-compatible .mpg), and dvdauthor. when watching the results on the computer screen, there were the typical comb-like artifacts in horizontal movements, which actually did not really disturb me. however when watching the movie on a dvd player / tv screen, then all horizontal movements show such an intense flickering that it really gives me a headache, also with strong comb effects. the only sensible explanation seems that the fields are played in reverse order, i.e. say if the camera records top fields first, then the player shows bottom fields first, or vice versa. to find out, i have experimented with the "format" settings in cinelerra and rendered four versions of a little test scene, each time starting cinelerra from scratch, setting the format, loading footage, rendering: 1. Preset "PAL" (interlace mode goes automatically to "bottom fields first"), 2. then changed interlace mode to "none", without changing anything else, 3. and to "top fields first", 4. and finally with preset "PAL Progressive" (50 fps). I have then converted these four test movies (tovid -pal -dvd ...) and combined them onto a test dvd (todisc -pal -dvd ...). but when playing on the dvd player + tv, all four looked the same, horribly flickering. so maybe it is not so much a problem with rendering in cinelerra, but with interlacing (and possibly swapping fields) in tovid, i don't know. anyone here who had any similar experiences? tovid -interlace did not work, or yes it made the machine work for some time but then no output was delivered, all temp files deleted and no end result. quite annoying, maybe that was the effect i need, how can i know... (i have also tried tovid -deinterlace, but astonishingly, the image was cropped so the entire right half of the image was black and also some black bar on the left. clearly not the intended result...) thanks for any kind of advice. georg -- dr.k.g.hooss wissenschaftliche medienberatung tel. +49-(0)451-3003-474 www.schoepfung-und-wandel.de
