[MPlayer-users] I wrote a mencoder mini-guide for DVD ripping

[Daniel Mladek]

Nico wrote:

>Hi!
>
>I just wrote a mini-guide for DVD ripping to Divx using mencoder, and I 
>thought that maybe you are interested. I'm attaching it to you, hope you like 
>it.
>
>Cheers,
>
>  Nico.
>
>P.D.: you are doing a great job with mplayer!!
>
>
>  
>
>
> ------------------------------------------------------------------------
>
>Ripping DVDs to Divx with mencoder (mplayer) 
>
>by paranouei (paranouei at jazzfree.com)
>
>
>We can do it in two ways, direct ripping to the .avi or doing "three pass encoding". The latter
>method is explained in http://www.bunkus.org/dvdripping4linux/single/index.html#transcoding_mplayer
>
>
>
>Direct Ripping
>
>
>1. play the DVD, calculate how long it last (including credits) in seconds, check if
>   the volume is too low (because we can turn it up with software). Also, if the image
>   looks strechted, maybe mplayer doesn't realize it's in 16:9 format, so we have to 
>   explicitly indicate it (with -aspect 16:9), and the image will be all right (this
>   happened to me with "Crouching Tiger Hidden Dragon"). And don't forget to check
>   in which "title id" does the movie start, usually movies start in id 1, but sometimes
>   there are trailers and such so it starts in a different title id (i.e. Crouching 
>   Tiger.. started in number 10) (mplayer -dvd 10).
>
>
>2. calculate the rate to get the desired file size. Knowing how many seconds it lasts,
>   you can use my script dvd-ripping (it's at the end) to get the rate. For example, 
>   if you want a file size below 700Mb, you have to calculate the best rate you can
>   use to get a file under that size."Rate" is the movie quality in kbits/s. 
>
>
>3. if the movie has black borders you can take them off. First, calculate the borders geometry
>   whith option cropdetect:
>
>       mencoder -aspect 16:9 -dvd 10 -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=694 -vop cropdetect,scale -zoom -xy 640  -oac mp3lame -lameopts br=128:vol=9 -o tigreydragon.avi
>
>   let it run for a while to make sure is ripping the real movie (and not just the credits)
>   and you'll get the values you have to pass to crop option to take the black borders off
>   (i.e. in Crouching Tiger.. I get crop=640:272:0:44). Keep in mind these values are relative
>   to the output resolution.
>
>
>4. run mencoder with your parameters. Here are some parameters I used:
>        vol=9 in -lameopts (this is because the volume was too low, so i gave it
>                            some gain. Valid values are between 1 and 10).
>        -aspect 16:9 (this is because mplayer didn't realize this was the original format
>                      so i was getting a stretched image).
>        vbitrate=694 in -lavcopts (video rate i got with my script dvd-ripping)
>        -dvd 10 it's the title id where the movie starts (usually is number 1)
>        crop=640:272:0:44 in -vop (to take the black borders off)
>
>   So the full command is
>
>      mencoder -aspect 16:9 -dvd 10 -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=694 -vop crop=640:272:0:44,scale -zoom -xy 640  -oac mp3lame -lameopts br=128:vol=9 -o tigreydragon.avi
>
>
>
>This will rip the movie directly from the DVD to the Divx avi file in only one pass. I
>recommend that at the same time you are ripping, play with mplayer the .avi in a 
>different terminal to check you are getting the desired format (resolution, quality,
>volume...)
>
>
>
>Three pass encoding
>
>
>This method is explained in http://www.bunkus.org/dvdripping4linux/single/index.html.
>Anyway his method use the *.vob files in the hard drive, and you can make it directly
>from the DVD with this method:
>
>1. First the sound:
>
>   mencoder -dvd 1 -ovc frameno -o frameno.avi -oac mp3lame -lameopts abr:br=128
>
>
>2. First pass:
>
>   mencoder -dvd 1 -nosound -oac copy -o /dev/null -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=800:vhq:vpass=1:vqmin=1:vqmax=31 -vop scale -zoom -xy 640 -npp lb
>
>
>3. Second pass:
>
>   mencoder -dvd 1 -oac copy -o file.avi -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=800:vhq:vpass=2:vqmin=1:vqmax=31 -vop scale -zoom -xy 640 -npp lb
>
>
>
>Script dvd-ripping:
>
>
>#!/bin/bash
>
>if [ $# != 1 ] ; then
>    echo "Use: dvd-ripping <movie size in seconds>"
>    echo ""
>    exit 1
>fi
>
># Biggest file size is 700mb, which is 716800kbytes but just in case we use a little smaller size
>MAXSIZE=700000
>
>SEGUNDOS=$1
>MINUTOS=$(($SEGUNDOS/60))
>
>#Audio rate is 128bits/s which is 16kbytes/s
>AUDIOSIZE=$((16*$SEGUNDOS))
>LIBRE=$(($MAXSIZE - $AUDIOSIZE))
>RATE=$((($LIBRE*8) / $SEGUNDOS))
>
>
>echo "Calculating rate for movie which lasts $MINUTOS minutes..."
>
>echo "Estimated rate: $RATE"
>
>FINALSIZE=$(( ($RATE * $SEGUNDOS)/8 + $AUDIOSIZE))
>
>echo "Estimated size: $FINALSIZE"
>
>echo "The command is:"
>echo "mencoder -dvd 1 -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=$RATE -vop scale -zoom -xy 640  -oac mp3lame -lameopts br=128 -o file.avi"
>
>  
>
>
>
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