Using --keep-hf to mpeg2enc does increase the output bitrate over keeping everything else the same and not using --keep-hf. However, it does, at least to me, seem to also eliminate the halo/ringing effect from sharp edge transitions in the encoded video.
I'm using DC10+'s to capture, and when I was experimenting I would compare the recorded mjpeg played back over a DC10+ to the encoded mpeg, and I did not "see" the halo from the DC10+ card, but did see it from the H+ playback of the encoded mpegs when I tried using -N (--reduce-hf). Not using either keep|reduce seemed to eliminate most of the halo/ghosting, but overall, I was happier with the --keep-hf encodings than without. As most of my usage is timeshift, a few megs this way or that often does not matter. For the times it does, I've found the results more pleasant to do yuvdenoise/yuvmedian and then adjust -q and -Q to meet my size needs than to use -N to shrink the resultant mpeg. I.e., that a lower -q value is far less noticeable than the halo from -N. --- Steven Boswell II <[EMAIL PROTECTED]> wrote: > > In a previous conversation on this mailing list, I was advised against > using --keep-hf with analog source material. However, my (informal) > tests seemed to indicate that --keep-hf did pretty good with denoised > (i.e. yuvdenoise/yuvmedianfilter) analog source material. I wasn't sure > if it was just my imagination. > Anyone have any experience with this? > Steven Boswell, [EMAIL PROTECTED] > > Richard Ellis <[EMAIL PROTECTED]> wrote:In my experience with > experimenting with the --reduce-hf flag to mpeg2enc, > that having the flag turned on created a ringing effect at sharp edge > transitions in the playback image. > [...] > I have not been able to find a similar effect from using > yuvdenoise/yuvmedian and turning on the "--keep-hf" flag to mpeg2enc. > > > --------------------------------- > Do you Yahoo!? > Yahoo! Web Hosting - establish your business online __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com ------------------------------------------------------- This SF.net email is sponsored by:Crypto Challenge is now open! Get cracking and register here for some mind boggling fun and the chance of winning an Apple iPod: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
