ffmpeg - not cosmic? I suggest you take another glance - one of the most important projects in the OSS world, for a variety of reasons.
Alex. On Sun, 2006-05-21 at 09:10 +0000, [EMAIL PROTECTED] wrote: > > > > just for information, here is the page of Michael Niedermayer (ffmpeg > > lead dev) about optimization : > > > > http://guru.multimedia.cx/category/optimization/ > > > > maybe it can help > > > > Vincent > > > > Could be a useful reference to have around.. > especially for those, like me, who often get their bits&bytes > confused... > Many years ago, I once attended my one-and-only ever > 'computer science' class, and the only thing I could remember > from that was some kind of 'mantra' that went something like > "eight bits in a byte.. eight bits in a byte.." > Unfortunately, I often ended up reversing the mantra > for some reason.. and I still do to this day. > > Thanks for the pointer :) > > Interesting the method mentioned there for computing > max and min. > > whereas I had, for a,b in the range [0,255], > min(a,b) = b - ((b-a)&(~(b-a)>>8)); > and > max(a,b) = a + ((b-a)&(~(b-a)>>8)); > > the page there uses, > min(a,b) = a + ((b-a)&((b-a)>>31)); > and > max(a,b) = b - ((b-a)&((b-a)>>31)); > > which presumably works for a greater range of values.. > that could be useful. > > In the particular case of the 'rgb2hsv' function, > the two methods give statistically identical results in > measurable performance (all else being the same). But again, > this could be useful in other contexts. > > I'll tell you what could be even more useful: > If said "multimedia guru" would take a short break from working > on 'ffmpeg' (whatever that is, it doesn't sound very cosmic), > and maybe seek out some "enlightenment" instead :) :) > > jose. > > > > > ------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642 > _______________________________________________ > enlightenment-devel mailing list > enlightenment-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/enlightenment-devel ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
