Re: [Mjpeg-users] kvcd or tmpgenc better with same filesize
On Tuesday 13 January 2004 06:27, Steven M. Schultz wrote: On Mon, 12 Jan 2004, Al Bogner wrote: What do you think makes a better encoding from excellent sources: the kvcd or tmpgenc matrix if the result should have the _same_ filesize. tmpgenc of course. the kvcd tables were designed to reduce the bitrate to allow for longer playing time - once detail/contrast/sharpness is lost it can not be recovered by raising the bitrate. With kvcd you can use higher bitrates. I have to encode a movie with Yes, and defeat the purpose of using the kvcd tables in the first place ;) Depending on the material you can see the effect of the kvcd tables - slight softening or less sharpness at times. Seconded... the kvcd matrices discard fine detail very aggressively. For good quality material this is not needed and can make gradations in shadings more visible than necessary. more than 2 hrs at a bitrate between 4000-4500kbps. For clean material I'd start with -q 6 -K tmpgenc -E -10 - that's been a good combination of parameters for me. Andrew --- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] kvcd or tmpgenc better with same filesize
Am Dienstag, 13. Januar 2004 22:09 schrieb Andrew Stevens: With kvcd you can use higher bitrates. I have to encode a movie with Yes, and defeat the purpose of using the kvcd tables in the first place ;) Depending on the material you can see the effect of the kvcd tables - slight softening or less sharpness at times. Seconded... the kvcd matrices discard fine detail very aggressively. For good quality material this is not needed and can make gradations in shadings more visible than necessary. So, if size doesn't matter is it _always_ better to use tmpgenc, also with _bad_ sources? I mean, when I encode an old VHS-movie with poor quality, could the result be _better_ with kvcd or does kvcd safe space only? Al --- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] kvcd or tmpgenc better with same filesize
On Wed, 14 Jan 2004, Al Bogner wrote: So, if size doesn't matter is it _always_ better to use tmpgenc, also with _bad_ sources? Well, if size doesn't matter you can use '-K hi-res' :-) What I use for high quality encoding is a custom table made up of the hi-res Intra matrix with the tmpgenc nonIntra matrix and then -K file=myfile I mean, when I encode an old VHS-movie with poor quality, could the result be _better_ with kvcd or does kvcd save space only? kvcd's claims to fame are 1) smaller filesizes (lower bitrate) and 2) reduced splotchiness (pixelization I think is the term used) during dark scenes. The kvcd folks never made any claims about increased quality. For old VHS movies that have been run thru yuvdenoise and/or the medianfilter the use of kvcd tables won't really hurt the picture too much more. A good reason to use the kvcd tables in this situation would be to reduce the blocks/splotches during dark scenes. Experimentation is an important part of the process - try it and see what happens. Cheers, Steven Schultz --- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] kvcd or tmpgenc better with same filesize
Hallo What do you think makes a better encoding from excellent sources: the kvcd or tmpgenc matrix, if the result should have the _same_ filesize. With kvcd you can use higher bitrates. I have to encode a movie with more than 2 hrs at a bitrate between 4000-4500kbps. If you have high quality sources like DVD, it does not matter which type of quanitsation matrix you use. In the worst (or maybe best) case the default matrix produces a lower filesize. Take a look at the mjpeg users archive from: Tue, 30 Sep 2003 20:41:21, Subject: -K, -q interaction - interesting. And search for articles with the subject: Custom quantization matrices initial results, some more information about that topic. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard --- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
