Difference between revisions of "Extract DVD"

Revision as of 13:40, 21 March 2012

This describes how to convert a DVD to mkv using:

• x264 for video
• ac3 for audio
• any subtitles

Installation

Install the packages

apt-get install mencoder mplayer gpac mkvtoolnix lsdvd

For using encrypted DVDs build and install libdvdcss from http://download.videolan.org/pub/libdvdcss/last

./configure --prefix=/usr
make
make install

Prepare

Use lsdvd to see what's on DVD. Determine the stream you would like to extract as well as the aid for audio and the sid for subtitles.

lsdvd -x /dev/dvd

Write the stream to the harddrive so the next steps will go faster.

mplayer dvdnav://<stream> -dumpstream -dumpfile <title>.vob

As I find it acceptable to have my DVDs compressed to 25% of its size I use the follow calculations to get the bitrate for video and audio.

length=`lsdvd -t <stream> -Ox 2>/dev/null | grep length | sed 's/^[^>]*>//' | sed 's/\..*//'`;vobsize=`find <title>.vob -printf '%s\n'`; bitrate=$(($vobsize*8/$length/4/5)); echo "audio bitrate = $(($bitrate/1000)) kb/s";echo "video bitrate = $(($bitrate*4/1000)) kb/s"

Video

Detect the amount to crop. Keep it running till it is stable for a while

mplayer <title>.vob -vf cropdetect

Use either OGG Video or x264

OGG Video

Convert the video stream to ogv

ffmpeg2theora --noaudio --nosubtitles --deinterlace -v 6 --optimize --speedlevel 0 --croptop <top> --cropbottom <bottom> --cropright <right> --cropleft <left> -K 250 

x264

Run the first pass on the video

mencoder <title>.vob -vf crop=<cropvalues> -oac copy -ovc x264 -x264encopts pass=1:bitrate=<videobitrate> -nosub -of rawvideo -o <title>.264

Run the second pass on the video

mencoder <title>.vob -vf crop=<cropvalues> -oac copy -ovc x264 -x264encopts pass=2:bitrate=<videobitrate> -nosub -of rawvideo -o <title>.264

Put the video in a MP4 container

MP4Box -add <title>.264 <title>.mp4

Audio

AC3

Now extract audio from the stream. Just use AC3.

mplayer <title>.vob -aid <aid> -dumpaudio -dumpfile <title>.ac3

Optionally compress the AC3 stream

OGG

Convert the ac3 file to 6 channel wave

mplayer <title>.ac3 -af resample=44100,channels=6:6:0:0:1:4:2:5:3:2:4:1:5:3 -channels 6 -ao pcm:nowaveheader:file=<title>.wav6

Convert the 6 channel wave to a 6 channel ogg

oggenc -r -B 16 -C 6 -R 44100 <title>.wav6

Subtitles

Extract the subtitles from the stream.

mencoder <title>.vob -oac copy -nosound -ovc frameno -o /dev/null -sid <sid> -vobsubout <title> -vobsuboutindex <index> -vobsuboutid <langcode>

Merging

Combine everything in a mkv container

mkvmerge -o <title>.mkv <title>.ogg <title>.idx <title>.mp4