Difference between revisions of "Extract DVD"

Revision as of 08:45, 30 March 2012

This describes how to convert a DVD to OGG video using:

• libtheora for video
• libvorbis for audio
• srt subtitles

Installation

Install the packages

apt-get install lsdvd ffmpeg mplayer oggz-tools

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

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

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

Investigate the VOB file and note the numbers for the videostream and the audiostream

avprobe <title>.vob

Some VOB files report the wrong duration so just in case rebuild the vob file but only with the required videostream and audiostream.

avconv -y -i <title>.vob -map 0:<videostream> -c:v copy -an -sn -f vob <title>_video.vob
avconv -y -i <title>.vob -map 0:<audiostream> -c:a copy -vn -sn -f ac3 <title>_audio.ac3

Audio

Get the bitrate

bitrate=`avprobe -show_format <title>.ac3 2>/dev/null | grep bit_rate | cut -d= -f 2 | cut -d. -f 1 `; echo $((${bitrate}/3/1000))

Now extract audio from the stream and convert to OGG.

avconv -y -i <title>.ac3 -c:a libvorbis -q:a 4 -ar 44100 -vn -sn -f ogg <title>.audio

Video

Detect the amount to crop.

avconv -y -i <title>.vob -t 600 -vf cropdetect -an -sn -f rawvideo /dev/null 2>&1 | tail | head -n 1 | sed 's/^.*crop=//'

Get the bitrate

bitrate=`avprobe -show_format <title>.vob 2>/dev/null | grep bit_rate | cut -d= -f 2 | cut -d. -f 1 `; echo $((${bitrate}/3/1000))

Convert the video stream to ogv

avconv -y -pass 1 -i <title>.vob -vf crop=<cropvalues> -g 250 -bf 16 -b: <video_bitrate>k -c:v libtheora -an -sn -f ogg <title>.video
avconv -y -pass 2 -i <title>.vob -vf crop=<cropvalues> -g 250 -bf 16 -b: <video_bitrate>k -c:v libtheora -an -sn -f ogg <title>.video

Subtitles

Extract the subtitles from the stream.

To do!!!

Merging

Combine everything in a ogg container

oggz-merge -o <title>.ogv <title>.video <title>.audio