[MEncoder-users] B-frames and GOP with MPEG-2 for DVD

[Nicolas Hesler]

Can anyone offer any input to the following command line?
I've been trying to refine for the highest possible quality of MPEG-2 
while staying DVD compliant.  The source is 24fps.
(Note: format=mpeg2, because format=dvd does not work with Adobe Encore 
2.0).

 From what I understand, keeping GOP open, improves quality.  Is this 
true? Is it 100% DVD compliant?

Do I want to introduce B frames in my encoding? (The vb_strategy part of 
my command line is currently useless, right?) If parts of my video are 
reaching into 9-10 Mbs bitrate, would it beneficial to introduce 
B-Frames? Will it improve quality? (This is probably a stupid question) 

Are the sync issues with bframes only relevant to mpeg4 or lavf?

mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=mpeg2:tsaf:telecine /
-vf scale=720:480,harddup -mc 0 -noskip -srate 48000 -af 
lavcresample=48000:0:2 -lavcopts / 
vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=7000:vbitrate=6000:keyint=12 
/
:trell:mbd=2:precmp=2:subcmp=2:cmp=2:dia=-10:predia=-10:cbp:mv0:vqmin=1:lmin=1 
/
:dc=10:vpass=1:vb_strategy=2:acodec=ac3:abitrate=224:aspect=16/9:vstrict=0 
-ofps 24000/1001 -o $output $input