Op donderdag 14-10-2010 om 18:13 uur [tijdzone +0200], schreef Eli Billauer: > Odin Omdal Hørthe wrote:
[snip NTSC -> PAL HDV trouble] > > Ooohh. You don't want to change the framerate. Really. That's a hard > > problem to tackle, and it's better to just not tackle it. Just use the > > framerate you're given at all times. > > > Agreed. Changing the framerate is asking the computer to guess what > happened between subsequent still shots. I suppose there are programs > that give reasonable results (does anyone know about such?), but unless > you have a clever algorithm, it boils down to either averaging in time > or accepting the jumps. Or just play the frames slower or faster as > necessary. > > So I can offer a few tricks, but the bottom line is that you'll have to > pick the one that is the least horrible for you: > 1. Just override the given framerate of your footage or rendered video. > That is, play it in 25 fps even though it has another original > framerate. Works well in particular when the audio track is completely > dubbed, so you don't need to slow down audio as well, and make everyone > sound like monsters. Creates a slightly dramatic look, but does good to > most footage. OK, I did some testing, but I can't figure out how to get Cinelerra (or another editor or CLI command) to change the actual playback framerate. In several projects (e.g. nature footage), a 16% slower playback speed is no problem at all, but what do I need to do to effectively have 30fps NTSC footage being treated as 25fps PAL footage? > 2. Use Time Average effect to smear the video in time. Will make the > video look like jelly, but less jumpy. It's a great effect in time lapse video and several other circumstances, but the results are quite ugly when applied to the NTSC stuff. > 3. Reduce to 24 fps (or 23.996 fps) for which there's a known method > (reverse telecine) and force the frame rate to play at 25 fps. This 4% > difference will go unnoticed. Hmm, apparently I can use mplayer to perform this trick, but how do I make MPlayer dump the result in a file instead of displaying it? Anyway, thanks again. Best regards, Richard Rasker _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
