[MPlayer-users] Creating a letterbox (PAL) VCD

[Colin Rosenthal]

RC wrote:
> On Thu, 30 Aug 2007 11:02:10 +0200
> Colin Rosenthal <csr at statsbiblioteket.dk> wrote:
>
>   
>>     vcodec=mpeg1video:keyint=15:vrc_buf_size=327:vrc_minrate=1150:\
>> vbitrate=1150:vrc_maxrate=1150:acodec=mp2:abitrate=224:aspect=4/3
>>     
>
> No options?  You're just asking for horrible video quality.  
>
> This is all extensive covered in the docs.
>
>   
Well quite. The problem is that it is so extensively covered in the docs 
that it's rather hard to know which of the many filter options,
for example, might make a significant difference. For example, we tried 
the following two-pass encoding:

FILTER="pp=hb/vb/dr/al/fd"

mencoder -oac twolame -twolameopts br=224 -ovc lavc -of mpeg -mpegopts 
format=xvcd -vf \
    scale=352:198,expand=352:288:0:45,$FILTER,harddup -srate 44100 -af 
lavcresample=44100 -lavcopts \
    vcodec=mpeg1video:keyint=15:vrc_buf_size=327:vrc_minrate=1150:\
vbitrate=1150:vrc_maxrate=1150:acodec=mp2:abitrate=224:aspect=4/3:vpass=1 
-ofps 25  \
    -o /dev/null 070507_1210.wmv

mencoder -oac twolame -twolameopts br=224 -ovc lavc -of mpeg -mpegopts 
format=xvcd -vf \
    scale=352:198,expand=352:288:0:45,$FILTER,harddup -srate 44100 -af 
lavcresample=44100 -lavcopts \
    vcodec=mpeg1video:keyint=15:vrc_buf_size=327:vrc_minrate=1150:\
vbitrate=1150:vrc_maxrate=1150:acodec=mp2:abitrate=224:aspect=4/3:vpass=2 
-ofps 25  \
    -o two_pass_filtered.mpeg 070507_1210.wmv

but really couldn't see any improvement.

-- 
Dr. Colin Rosenthal MSc-IT
IT-Developer, Digital Resources
Statsbiblioteket                      tlf: 89462074
DK 8000 Århus C