Steven M. Schultz wrote: > > For a long time there have been known issues with encoding at low quality > > factors such as q=2 (ie: high quality encoding) on ix86. I understand this > > Not -q again. Seems like just yesterday there was (yet another) > discussion about it.
Ok, I must be blind. Ever since the issue came to light I've been watching for news on it but I never saw anything. > > was due to something related to potential overflows in some parts of the MMX > > code. From memory the general recommendation from a year or so ago was that > > "or so" ;) The mmx code was rewritten/updated/modified between > December 2004 and March 2005 to workaround/fix the issues with > overflow in the mmx routines. Right. I'm blind. :-) > > on ix86 one shouldn't go below a "q" value of 3. > > That's still, if you understand what -q is and so on, good advice > most of the time ;) For sure. The point is that with the MMX code fixed there's no potential for overflow no matter what the quality setting which gives one a little more confidence. > > What is the current status on this - does mpeg2enc still suffer this > > limitation or has it been dealt with? > > The current state, since approximately Feb 19, 2007, is that mpeg2enc > is BROKEN and should not be used. If you DO use it then -q of 4 or > higher MAY produced uncorrupted output. I vaguely recall something about this. > Last known working mpeg2enc is RC1. RC2 is broken. Given this I assume it's known what broke it and that it will be fixed before RC3 (or final) is released. Is anyone working on it at the moment or is there a need for more eyes? Regards jonathan -- "Time is an illusion; lunchtime doubly so" ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
