[mythtv-users] transcoding perfect dvd rips to xvid

[matthew.garman at gmail.com]

On Wed, Feb 21, 2007 at 11:59:13AM -0800, Blammo wrote:
> Mind sharing your convert script? I've been thinking about doing
> the same thing, since my /video folder is getting full.. and I
> don't want to lose the AC-3 format in the conversion.

I came in late on this thread, but here's my "work in progress"
encoding script.  The intent is for encoding material from a DVD
source.

The end result with this script are Matroska video (mkv) files with
H.264 video and Ogg Vorbis audio.

You'll also have a AVIs with the same video, but AC3 audio.  (The
AVIs will play with mplayer, although I think they're technically
"broken" AVIs.)

Some caveats:

    - I had to upgrade to mkvtoolnix 2.0.0 before I could import
      these "broken" AVIs directly into an mkv file.  (Before, I had
      to use avi2raw to extract the raw h264 video.  mkvmerge also
      couldn't take raw h264, so I had to use MP4Box to put it in an
      MP4 container.  And after all that was said and done, I had
      terrible A/V sync problems.)

    - This assumes that your source material is progressive.  You'll
      have to add the pullup,softskip filters to mencoder's -vf
      chain to de-interlace.  I haven't yet verified if this works
      without causing A/V sync problems.

Good luck!


for i in 1 2 3 4 ; do
    fnbase="dvdrip_${i}" ;
    src="-dvd-device /dev/dvd dvd://${i}"
    time nice -n 20 mencoder -aid 128 -alang en -oac copy \
        -ovc x264 -x264encopts \
        bitrate=2000:partitions=all:8x8dct:me=umh:subq=6:frameref=5:threads=auto:pass=1:turbo=1:bframes=4:b_pyramid:weight_b \
        -ofps 24000/1001 -of avi -vf hqdn3d=2:1:2,pp=ac,harddup -idx \
        -o /dev/null \
        ${src} >> mencoder.log 2>>mencoder_stderr.log ;
    time nice -n 20 mencoder -aid 128 -alang en -oac copy  \
        -ovc x264 -x264encopts bitrate=2000:partitions=all:8x8dct:me=umh:subq=6:frameref=5:threads=auto:pass=2:bframes=4:b_pyramid:weight_b \
        -ofps 24000/1001 -of avi -vf hqdn3d=2:1:2,pp=ac,harddup -idx \
        -o ${fnbase}.avi \
        ${src} >> mencoder.log 2>>mencoder_stderr.log ;
    time nice -n 20 mplayer ${src} -ao pcm:fast:file=${fnbase}.wav \
        -vc dummy -aid 128 -alang en -vo null ;
    time nice -n 20 oggenc -q7 ${fnbase}.wav ;
    time nice -n 20 vorbisgain ${fnbase}.ogg ;
    time nice -n 20 mkvmerge -o ${fnbase}.mkv -A ${fnbase}.avi ${fnbase}.ogg ;
done