> > Ok. I wonder - is ppm2raw creating 4:1:1 or 420paldv? Should be PAL, as a -n option is required for NTSC
> That's why there's a choice of scaling kernels - pick the right one > for the task. Thanks to Matt, the further it goes the more I appreciate the work put into this project ! > The thought I had was that going from 4:4:4 to 4:1:1 to 4:2:0 involves > 2 resamplings of the chroma and resampling never improves quality. No it is from 422 to 420. doesn't mpeg2enc encode in 420 ? I replaved the chromass 444 par 420 JPEG > Ah, ok. I thought perhaps you were doing the left to right swap as > the data was being captured or shortly after that. At one time you > were thinking about using yuvfps to do the rate conversion or perhaps > writing a custom pulldown program. Too complex to me, I am not a programmer at all ... Well I did a bit 15 years ago in Pascal... > The rate control seems to have improved in the cvs version of mpeg2enc > so I think you'd be fairly safe with 8000. Not sure if it'd make much > difference. Well most of the movies being mute I can trade off the audio bitrate and give more room to frames maybe. > I don't care for it but that doesn't make it evil ;) the man mpeg2enc was .... explicit :-) > It gives more predictable filesizes by allowing the encoder to > dynamically vary the effective -q. Ok that is still an option then. > Two things I've found that really help a LOT with the blockiness in > dark scenese are 1) look at the data with a waveform monitor and > check the black levels - Well, Xavier Biquard wrote yuvcorrect that is spitting some data I might go back to him... > if they are consistently higher than 16 then > 'crush the blacks' slightly and 2) "desaturate the lows" - the human > eye does not see color well in the dark but the encoder does and the > blocks you see are a result of that. Removing some of the color info > from darker areas works wonders. For these types of things I use > Final Cut Pro. -q 4 does certainly help a lot..... removing -H as well and Yuvcorrect may well be what I need to use.... for now. Thanks again E ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
