The issue with 15/30fps is not just file size. CPU utilization is also a concern. H.264 and On2 VP6 (Flash 8 video) are extremely CPU-intensive, and other codecs are as well but to a lesser extent. Going from 15 to 30 fps doubles your CPU utilization on decompression.
> -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of Steve Watkins > Sent: Monday, January 08, 2007 8:31 PM > To: [email protected] > Subject: [videoblogging] Re: FPS setting for high motion video? > > Those do seem quite good. > > I suppose there may be other factors which make some of the > 15fps stuff Ive seen seem much more jerky than your videos, > Ive never worked out why I seem to notice it more with > certain videos, and be put off it, and not others. I guess > 15fps might be slightly less appropriate for people in PAL > countries where the standard framearate is 25, and so 15 is > not halving the framerate. But I think theres some other > factors at work, dunno. > > Last time I discussed this here, it seemed I was in a > minority with my complaining about 15fps. > > Certainly traditional TV, and some areas of the 'science of > motion pictures', suggests that 25 or 30 fps, 50 or 60 fps > interlaced, is necessary to give results that really look > smooth to the mind (similar to rate of fluorescent tube > lighting rate needing to be 50Hz or much higher to avoid the > brain picking up flickering). And some gamers spend quite a > lot of money trying to get high framerates of over 100fps for > maximum gaming experience, but I guess just like resolution, > video on the internet has proved that much lower rates can be > gotten away with without totally spoiling the experience. > > If anybody is curious Id say just try encoding your footage > at the native framerate of your camera, and see how much you > can or cannot tell the difference. Your files wont end up > twice as large or anything like that, under most > circumstances, for reasons I wont waffle about right now. > > I guess its probably not worth losing any sleep over either > way, would love it if people ocasionally revisited the issue > rather than everyone 15fps-ing it just because its what > they've gotten used to doing, but the more I think about it > the more I recall how unimportant it seemed to end up when I > waffled about this 18 months->2 years ago. > > Cheers > > Steve Elbows > --- In [email protected], Ron Watson <[EMAIL PROTECTED]> wrote: > > > I would be interested in this discussion as well. > > Can 15 fps deliver nice video with high motion? > > > > I think the .mov files I post at http://k9disc.blip.tv do a pretty > > good job, and I believe they are 15 fps. (Pick an outdoor > vid for high > > motion.) > > > > Can I do better with a different frame rate? > > > > I just went with 15 because I thought it would at least be an even > > motion, being half ntsc and all. > > > > I'd love to hear more about this. > > > > Cheers, > > Ron > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > > Yahoo! Groups Links > > > >
