[MPlayer-users] Bad quality ("horizontal lines on movement") an mpeg2->divx

[Steven Adeff]

Corey, I actually used that bash scripting page to write the script I'm
using. I'll have to look over what you wrote below and see if i can
figure out how to do the parsing...

for anyone interested, here's my script so far. basically you give the
name of the mpeg you wish to 3-pass convert. I'm going to keep working
on it. Right now I'm setting it up for TiVo mpeg conversion, but if I
can get that correct and working, I'll add extra options so you can
change the audio and video bitrate, etc. from the command line
paramaters.

-------------mpeg2divx--------------
#!/bin/bash
echo
echo "We will now convert \"$1\" to a divx file..."
echo

if [ -n "$1" ]
then
	filename=$1
else
	echo "no file name given, exiting"
	exit 1
fi

if [ -e "frameno.avi" ]
then
	rm frameno.avi -f
else
	echo "frameno.avi not found, not a problem, it just means we have
nothing to delete."
	echo
fi
if [ -e "lavc_stats.txt" ]
then
        rm lavc_stats.txt -f
else
        echo "lavc_stats.txt not found, not a problem, it just means we
have nothing to delete."
        echo
fi



echo "Beginning Audio Encoding..."
echo
mencoder $1 -ovc frameno -oac mp3lame -lameopts br=128:vbr=4:q=0 -o
frameno.avi

if [ -e "frameno.avi" ]
then
	echo "Audio encoding done, starting video encoding pass 1"
	echo
else
	echo "Audio encoding failed, exiting"
	exit 1
fi

mencoder $1 -npp lb -ovc lavc -lavcopts vcodec=mpeg4:vhq:vpass=1 -oac
copy -sws 2 -o output.avi
if [ $? -eq 0 ]
then
	echo "Video Pass 1 done, beginning video encoding pass 2"
	echo
else
	echo "Video encoding pass 2 failed, exiting"
	exit 1
fi

mencoder $1 -npp lb -ovc lavc -lavcopts vcodec=mpeg4:vhq:vpass=2 -oac
copy -sws 2 -o output.avi
if [ $? -eq 0 ]
then
	echo "Video Pass 2 done, file renaming time!"
	echo
else
	echo "Video encoding pass 2 failed,exiting"
	exit 1
fi

if [ -e "output.avi" ]
then
	echo "renaming output file"
	filename=${filename%.*g}
	mv output.avi $filename.divx
else
	echo "conversion failed at some point, no output.avi file found!"
	exit 1
fi

echo "Done converting!!"
ls -lh $filename*

-------------mpeg2divx--------------
On Sun, 2002-07-14 at 17:26, Corey Hickey wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Corey Hickey wrote:
> > As far as I know, you need to parse the mencoder output. I could tell
> > you a way to do that, but I don't know enough about scripting to write
> > a nice, clean method. Perhaps someone else here can help you out with
> > that.
> 
> On second thought, I just checked the output, and the parsing is easier
> than I thought. You just need to have something like this:
> 
> #---snip---
> #do the first pass, redirect stderr to stdout,
> #and copy stdout into output.log
> mencoder -whateveroptionsyouwant 2>&1 | tee output.log
> 
> #extract the recommendation line. Change $3 to suit your purposes
> RECOMMEND=$(grep "$3MB CD" output.log)
> 
> #strip the longest instance of anything that starts with R and ends
> #with (space) from the beginning of the variable
> BITRATE=${RECOMMEND##R* }
> 
> #do whatever you want
> mencoder -allyourotheroptions -lavcopts vbitrate=$BITRATE
> #---snip---
> 
> -Corey
> 
> _______________________________________________
> RTFM!!!  http://www.MPlayerHQ.hu/DOCS
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> 
-- 

Steven Adeff
ADEFFS at RPI.EDU
Rensselaer Polytechnic Institute
AOLIM:"IndieRockSteve"

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