software:mencoder
Table of Contents
setup mplayer on debian the right way for encoding
- first: apt-get install gcc make libxv-dev libsdl1.2-dev vorbis-tools mkvtoolnix
- you have to download and compile at least (see mplayer-docs for where to get the software)
- the x264 codec
- lame (if you want mp3 sound encoding)
- vorbis-tools (contains 'oggenc' for encoding sound to ogg vorbis)
- mplayer itself
- procedure to find out what dev-files are needed:
- get mplayer-sources, run ./configure
- less configure.log, look for i.e. “Xv” which you need enabled, see what files are needed.
- then use https://packages.debian.org or the application apt-file to find out what package contains the file
- for cutting videos i like ProjectX: https://avidemux.org/admWiki/index.php?title=Project_X
reading dvd-tracks out
- mplayer dvd://1 -dvd-device /path/with/vobfiles # play from directory
# find out what tracks you want to encode for i in 1 2 3 4 5 6 7 8; do mplayer dvd://$i done media=disc3 for i in 3 4 5 6; do mplayer dvd://$i -dumpstream -dumpfile ${media}_t${i}.vob # dump track in a file done
preprocessing
- Started cropping black stripes off bevore encoding. 'mplayer disc1_t3.vob -vf cropdetect' gives hints, 'mplayer disc1_t3.vob -vf crop=688:560:18:8' actually crops, 'mplayer disc1_t3.vob -vf rectangle=688:560:18:8' shows what will be cropped off. The resulting pixelranges should be dividable by 16 for efficient encoding later.
- Noticed when fast moves in the video happen that video is interlaced. 'mplayer -pphelp' shows some possible options, 'man mencoder' also leads to option filmdlint and others. Just '-vf pp=li' does the job for me. Can be checked with 'mplayer disc1_t1.vob -vf crop=688:560:18:8,pp=li'.
encoding files with multiple audio-streams
preparations: mplayer strean.m2t -v # find out numbers of audio-streams. for example 512 and 513. mplayer stream.m2d -aid 512 # verify first audio-stream
The command for 2pass-encoding all files ending in .ts is:
for i in file*.ts ; do #VFOPTS='-vf crop=704:560:0:8,softskip,harddup' VFOPTS='-vf pp=lb,softskip,harddup' TITLE='my title' BITRATE='bitrate=900' OPTSLOW="subq=3:8x8dct:bframes=9:frameref=2:weight_b:keyint=300:threads=auto" OPTSHIGH="subq=5:8x8dct:bframes=9:frameref=4:weight_b:keyint=300:mixed_refs:b_adapt" OPTSHIGH="$OPTSHIGH:direct_pred=auto:partitions=all:trellis=1:me=umh:me_range=16" OPTSHIGH="$OPTSHIGH:psy-rd=0.5,0.3:qcomp=0.7:nr=300:threads=auto" OPTSHIGH="$OPTSHIGH:psnr:ssim:log=2" # output-options OPTSHIGH="$OPTSHIGH:nointerlaced:nofast_pskip:nodct_decimate" # no longer in mappage=no longer used? # get audiostreams out mplayer $i -ao pcm:fast:waveheader:file=${i}_ger.wav -vc null -vo null #mplayer $i -ao pcm:fast:waveheader:file=${i}_eng.wav -vc null -aid 193 -vo null mencoder $i -o /dev/null -nosound $VFOPTS -ovc x264 -x264encopts \ $BITRATE:pass=1:$OPTSLOW:turbo=2 || exit 1 mencoder $i -o $i.2pass_x264.avi -nosound $VFOPTS -ovc x264 -x264encopts \ $BITRATE:pass=2:$OPTSHIGH || exit 1 oggenc -q5 ${i}_ger.wav #oggenc -q5 ${i}_eng.wav mkvmerge -o $i.mkv --title "$TITLE" --language 2:ger \ $i.2pass_x264.avi ${i}_ger.ogg # mkvmerge -o $i.2.mkv --title 'ggf' --language 2:ger --language 3:eng \ mkvmerge -o $i.2.mkv --title "$TITLE" --language 2:ger $i.mkv done
demultiplexing sound
For example to get mp3-file out of .flv files, ignoring the video-part.
# first try dumping the audio-stream, all two commands below try to do this: mplayer infile.flv -ao pcm:fast:waveheader:file=outfile.wav -vc null -vo null mencoder -ovc frameno -oac pcm infile.flv -o outfile.wav -of rawaudio # if you get a useful outfile.wav just encode it to ogg or mp3: lame outfile.wav # this encodes directly just the audio. br=128 is the mp3-average bitrate. You could just # use the bitrate from the inputfile. The audio gets reencoded thou, so quality gets worse anyway. mencoder -ovc frameno -oac mp3lame -lameopts abr:br=128 -of rawaudio inputfile.flv -o outputfile.mp3
software/mencoder.txt · Last modified: 2022/08/03 13:16 by 127.0.0.1