[MPlayer-users] Mencoder 2pass bitrate control

[Stanislav Stantchev]

Hi, 

i am new to this mailing list. i have some problems with mencoder. i
installed MPlayer-1.0pre3 with XVID-1.0beta2 & everything seems to work
fine, but i have problems with the 2pass bitrate control. here is the
command line i use to test mencoder: 

mencoder file.vob -ovc xvid -xvidencopts
pass=1:vhq=1:qpel:me_quality=6:hq_ac:trellis:chroma_me:max_bframes=3:clo
sed_gop:keyframe_boost=0:overflow_control_strength=10:max_overflow_impro
vement=40:max_overflow_degradation=40:bquant_ratio=150:bquant_offset=100
:bf_threshold=0 -sws 9 -vf crop=720:362:0:56,scale=640:320 -nosound -o
mencoder.avi

for the second pass i just change pass=2:bitrate=900 for an example. the
thing that bothers me , is that after encoding i don't get the wanted
bitrate. when i ask for 900, i get 761 or when i ask for 650 i get 521.
it's 1 of 5 times when i get the bitrate i want. maybe i am doing
something wrong. i would appreciate is very much if someone can help me.
if that helps more, i am using Slack-9.1, PIII-M 1GHz, 256MB ram. 

Thanks for your help! 

Stantchev

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