On 19 Dec 2003, Florin Andrei wrote: > You mean that for whole movies (> 1 hour) or for smaller scenes?
For the movie as a whole. Shorter scenes will, as you have seen, run up against the limit and there's nothing "wrong" about that. The guidline often is given as 20% but I've found 10% to be workable too. > The results? If i set -q so that the average is 10% lower than peaks for > the whole movie thing, there will be scenes (not just a second or two, > but entire scenes) where the bitrate will be pressed hard into the Nothing wrong about that - as long as it's short term relative to the entire movie. > I am not exactly sure what's going on with those "bitrate crushed into > the ceiling" scenes, but there's something weird about them. All bugs Lots of motion would be one reasonable cause. Professional encoding folks will apply a selective blur to those types of scenes - not to the entire movie. The human eye would just be seeing a blur of motion anyhow so a slight soften/blur by the encoder would lower the bitrate to keep the peak rate in bounds. Perhaps when Andrew gets the 2 pass encoding going there will be hooks for selective filtering of regions where the encoder was running up against the rate limit. > everywhere in the video chain (recording, processing, storing, playing) > tend to be much easier revealed by them. > E.g., mplex reports the average being higher than the peak. :-) Statistical anomaly - I've seen it too. What I'd really like to have is a bitstream analyzer that could take a stream and produce plots/reports about the bitrate (and other info). Cheers, Steven Schultz ------------------------------------------------------- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278&alloc_id=3371&op=click _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users