On Sun, 9 Jan 2005, Steven M. Schultz wrote: > On Sun, 9 Jan 2005, Trent Piepho wrote: > > > I thought that Dik meant the effective -q never went below 8, even though > > it go have gone all the way to 4 and still be within the target bitrate. > > If that's happening it's a Bug. It might start out at 8 but > with 'cbr' I've seen the encoder vary (and over a wide range) the > effective -q in order to keep close to the specified bitrate.
Even if the CBR mode didn't have this bug, it's still fundamentally at a disadvantage vs VBR. The reality is that a given stream will have some parts which are more complex and need more bits to encode than other parts. In VBR mode the encoder can use fewer bits for the easy parts and more bits for the hard parts. In CBR mode the encoder is forced to waste bits on the easy parts when the extra bits result in little improvement, and then it is forced to drop quality on the hard parts when using some extra bits would result in a large improvement. ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
