On Thu, Dec 16, 2004 at 03:41:49PM +0100, Frank Albrecht wrote: > > On Wed, Dec 15, 2004 at 10:35:06AM +0100, Frank Albrecht wrote: > >> Yes, from the DVD-T Box via fbas(composite). This Signal > >> contains already Blocks due to the mpeg-bitrate. > > > Do you mean that the signal from the DVD-T box that is being > > recorded already has mpeg compression artifacts in it before you > > even begin recording? > > Yes, exactly. > > > If this is the case, then no amount of fiddling with mpeg2enc > > parameters will help. Garbage in - Garbage out. You might have > > some luck with some of the denoising filters, they may be able to > > clean up somewhat a signal that is already badly messed up. But > > if your source video signal already has mpeg artifacts, you've > > already lost 90% of the game right there, before you even begin. > > Yes, I do know that. I can't decrease artefacts, but i don't want > to increase them because of the "double-compressing". Therefore i > am asking for (dis)advantageous Parameters. > > I am still testing ;-)
For your purposes, you may just have to experiment until you find what works for you. With that said, you should probably consider looking through the archives for mpeg2enc suggestions for higher quality encoding. If you want minimal second artifact creation, you'll want to run mpeg2enc with "high quality encoding" parameters. So, things potentially to avoid (off the top of my head): -N (or at least to large of a -N value), too high (large numerical value) for -q, too small of a -b bitrate ceiling (you will want to raise the ceiling so mpeg2enc has more room to work), too much of -Q (if you even use -Q). Additionally you might try the hq quant matrices (-K hi-res) or you might even want to try Steven Schultz's custom combination matrices (search the archives, he has posted them several times) instead. ------------------------------------------------------- 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://productguide.itmanagersjournal.com/ _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
