-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 08/14/2010 10:04 AM, Dan Dennedy wrote: > On Wed, Jul 21, 2010 at 10:51 AM, Simon Eugster <simon...@gmail.com> wrote: >> Dear friends, >> >> I've just added an RGB parade to kdenlive. While testing I found >> something interesting: Although I'm painting on a rect with height 256 >> (as atm we're dealing with 8 bits per channel only) and scaling the >> parade afterwards to the target height, I got kind of scanlines. >> Compare these two images: >> http://granjow.net/uploads/kdenlive/kdenlive-mlt-rgbparade-noeffect.png >> http://granjow.net/uploads/kdenlive/kdenlive-mlt-rgbparade-witheffect.png >> With the MLT effect there are scanlines, without it there are none. >> >> This is quite interesting, as this visualizes how color information >> gets lost when converting between different color spaces (according to >> [1], MLT is using YUV422, the input image is RGB). >> >> Basically I just wanted to show you this because it is interesting. >> But in the long term one of our goals should also be to avoid either >> conversion to other color spaces or the loss of information caused by >> the conversion. > > I just pushed some changes in mlt to fix this problem when using > libswscale - at least on my version. It adds some flags, but some > flags are needed for some color/pixfmts and different flags for > others. Use an incorrect flag, and the results are totally disastrous! > So, I am little worried that it might be version-sensitive. It would > be good if you and others could update mlt from git, test it, and see > if this problem resolves for you without introducing disaster. >
Seems to work here with libswscale 0.11 (ffmpeg svn r24762). The gaps are gone and the image looks still as it should. regards till -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxmr4cACgkQzwEyz7QP6nT4LwCeIApCLXjsKZi1ztONol79Oo/j Pk4AnjrVR0hDTA1hr+U7PZa1LkKyU2jQ =h0Vh -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Kdenlive-devel mailing list Kdenlive-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kdenlive-devel
