[MPlayer-users] What are b_frames for and should I use them for my mpeg2 encodings(for DVD) ?

[VJ]

Ok guys, I started using 2 B-Frames and now I got A/V sync problem.
How do I get rid of that? My command is as following



for pass in 1 3 3 3
do

#frames=" -frames 300 "
 mencoder $frames -noskip -skiplimit 0 -mc 0 -sws 2 -oac lavc
-lavcopts acodec=mp2:abitrate=128 -ovc lavc -lavcopts
vcodec=mpeg2video:preme=2:mbd=2:vqblur=0:mbqmin=1:vqmin=1:vrc_buf_size=1835:vbitrate=4000:vrc_maxrate=4000:trell=1:aspect=4/3:keyint=10:vmax_b_frames=2:vstrict=-1:scplx_mask=0.5:lmin=0.3:vrc_buf_size=1835:intra_matrix=8,9,12,22,26,27,29,34,9,10,14,26,27,29,34,37,12,14,18,27,29,34,37,38,22,26,27,31,36,37,38,40,26,27,29,36,39,38,40,48,27,29,34,37,38,40,48,58,29,34,37,38,40,48,58,69,34,37,38,40,48,58,69,79:inter_matrix=16,18,20,22,24,26,28,30,18,20,22,24,26,28,30,32,20,22,24,26,28,30,32,34,22,24,26,30,32,32,34,36,24,26,28,32,34,34,36,38,26,28,30,32,34,36,38,40,28,30,32,34,36,38,42,42,30,32,34,36,38,40,42,44:vpass=$pass
-of mpeg -mpegopts format=dvd -vf
crop=688:560:18:6,hqdn3d,expand=720:576 InFile.mpg -o "Outfile.mpg"
done
rm divx*.log