On 4/23/05, William <[EMAIL PROTECTED]> wrote: > Hello List, > > I would like to transcode down some mpeg2 (pvr-250) recordings into (mpeg4, > avi, divx, whatever...) to keep as videos for when people come over. This is > primarily for kids stuff but I would like to keep some adult titles too. > Here is my question. > > What is the best format and settings to give a good reduction in file size > without noticably reducing the quality of the picture? Please note that I am > viewing on a hi-def widescreen monitor so good picture quality is vital. The > format does not need to be directly supported by transcode but it needs to > be playable with mplayer or xine. Avidemux2 comes to mind as an alternative > for doing the conversions. > > I tried transcoding using the default mpeg4 settings in myth but the results > were very poor. Very blocky and lots of artifacts. Maybe acceptable for kids > but not personnaly. Any thoughts? > > Bill > >
After much experimentation, I used the following with good results for compressing PVR-250 mpeg2's to mpeg4. While slower on encoding , the msmpeg4v2 codec leaves me with a file easily playable on windows, and the quality seem's a tad better. I usually play the files with mythvideo on my high def Sony. TARGET="source.nuv" OUTPUT="/data/video/new-file.avi" #optimal bitrate is 5.86*width*height OPTIONS="vbitrate=3000000:mbd=2:keyint=132:vqblur=1.0:cmp=2:subcmp=2:dia=2:mv0:last_pred=3" rm -f frameno.avi nice -n 19 mencoder $TARGET -vop denoise3d,lavcdeint \ -ovc lavc -lavcopts vcodec=msmpeg4v2:$OPTIONS:vpass=1 \ -oac mp3lame -lameopts cbr:br=128 \ -o $OUTPUT nice -n 19 mencoder $TARGET -vop denoise3d,lavcdeint \ -ovc lavc -lavcopts vcodec=msmpeg4v2:$OPTIONS:vpass=2 \ -oac mp3lame -lameopts cbr:br=128 \ -o $OUTPUT On some shows, like the new Battlestar, I needed to crop the black bands and add the "-aspect 4/3" flag to the mythvideo settings. Shows went from 2.2 gig to under 700 meg after compression and and commercial editing. Barry _______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
