[MPlayer-users] bad calculation of avi file?

[Alejandro Néstor Vargas]

I'm having a problem. I made a 3 pass enconding, trying to obtain a 700M avi frm a
vob file, but the result is much smaller (570). Any Ideas?


The steps I followed are these:

First pass:

rm frameno.avi
mencoder a.vob \
         -ovc frameno \
         -oac $compresion_audio \
         -oac mp3lame -lameopts cbr:br=96:vol=5 -aid 129 \
         -o frameno.avi

The result:

CBR audio: 12000 bytes/sec, 288 bytes/block
Writing AVI index...
Fixing AVI header...
Recommended video bitrate for 650MB CD: 804
Recommended video bitrate for 700MB CD: 874
Recommended video bitrate for 800MB CD: 1015
Recommended video bitrate for 2 x 650MB CD: 1719
Recommended video bitrate for 2 x 700MB CD: 1859
Recommended video bitrate for 2 x 800MB CD: 2141

Video stream:    0,767 kbit/s  (95 bps)  size: 571604 bytes  5959,980 secs  142901
frames

Audio stream:   96,000 kbit/s  (11999 bps)  size: 71525952 bytes  5960,496 secs

==============================================================================

-rw-r--r--    1 root     root     82347000 2003-03-25 20:14 frameno.avi

==============================================================================

Then I choosen bitrate=874

mencoder a.vob \
         -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=874:vpass=1:vqmax=31:vhq \
         -oac mp3lame -lameopts cbr:br=96:vol=5 -aid 129 \
         -o a.avi

mencoder $entrada \
         -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=874:vpass=2:vqmax=31:vhq \
         -oac mp3lame -lameopts cbr:br=96:vol=5 -aid 129 \
         -o a.avi

rm divx2pass.log



Video stream:  699,369 kbit/s  (87421 bps)  size: 521024964 bytes  5959,946 secs
142901 frames

Audio stream:   96,000 kbit/s  (11999 bps)  size: 71525952 bytes  5960,496 secs

==============================================================================

The resulted file is this much smaller than the expected 700 Mb:

-rw-r--r--    1 root     root     597197368 2003-03-25 17:40 a.avi



-- 
Alejandro Néstor Vargas
E-mail: anv at xnetcuyo.com.ar
Jabber: anv at xnetcuyo.com.ar
ICQ: 20528995.
Departamento de Desarrollo
X Net Cuyo S.A.