Re: [MEncoder-users] two-pass encoding for DVDs

>
> If that bug exists and hasn't been fixed, then it's not a good idea to
> use two-pass encoding to create video DVDs, so I shouldn't add two-pass
> encoding to my Mencoder front-end.
>
> Thanks.
>
>
This should probably be answered by someone who knows exactly how rate
control works, but in doing many tests on video files that I've been
encoding, vrc_maxrate=7000:vbitrate=6000 works well enough in 2 pass
mode for me; keeping the bitrate spikes a little below the allowable
maximum. All I did to figure out those numbers was to encode many many
files under different settings and analyze the resulting file with a
bitrate viewer. Please share if you find anything different. Other
settings may affect this but I haven't tested.

mencoder -sws 2 -oac lavc -ovc lavc -of mpeg -mpegopts
format=mpeg2:muxrate=10080:tsaf:telecine -vf
scale=720:480,harddup -srate 48000 -af lavcresample=48000:0:2 -lavcopts
vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=7000:vbitrate=6000:trell:mbd=2:preme=2:dia=4:predia=4:
precmp=2:cmp=2:subcmp=2:cbp:mv0:acodec=ac3:abitrate=224:keyint=12:vpass=1:autoaspect:vstrict=0
-ofps
24000/1001

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