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=mkv

==info

  mkvmerge --identify "$mkv"

<HTML><blockquote><pre>
File '/docs/video/some-file.mkv': container: Matroska
Track ID 0: video (MPEG-4p10/AVC/h.264)
Track ID 1: audio (DTS)
Track ID 2: subtitles (SubRip/SRT)
Track ID 3: subtitles (SubRip/SRT)
Track ID 4: subtitles (SubRip/SRT)
Track ID 5: subtitles (SubRip/SRT)
Track ID 6: subtitles (SubRip/SRT)
Track ID 7: subtitles (SubRip/SRT)
Track ID 8: subtitles (SubRip/SRT)
Track ID 9: subtitles (SubRip/SRT)
Track ID 10: subtitles (SubRip/SRT)
Track ID 11: subtitles (SubRip/SRT)
Track ID 12: subtitles (SubRip/SRT)
Track ID 13: subtitles (SubRip/SRT)
Track ID 14: subtitles (SubRip/SRT)
Track ID 15: subtitles (SubRip/SRT)
Track ID 16: subtitles (SubRip/SRT)
</pre></blockquote></HTML>	

==Extract subtitles

  mkvinfo --summary "$f" | head -10 \
  | perl -nle 'if ( /^Track (\d+): subtitles, codec ID: ([A-Z_]+).*extract track ID: (\d+)(?:, language: (\S+))?/ ) {
      warn "$_=$1: type=$2, xtrack=$3, lang=$4\n"; print "$2 $3 $4" }' \
  | while read type t lang; do d=$(dirname "$f"); b=$(basename "$f"); 
      echo "#Run this:# mkvextract tracks \"\$f\" $t:'$d/$b-$lang-$t.$type'"; done

<HTML><blockquote><pre>
Track 3: subtitles, codec ID: S_TEXT/UTF8, mkvmerge/mkvextract track ID: 2, language: por  =  3: type=S_TEXT, xtrack=2, lang=por
Track 4: subtitles, codec ID: S_TEXT/UTF8, mkvmerge/mkvextract track ID: 3, language: eng  =  4: type=S_TEXT, xtrack=3, lang=eng
...
# mkvextract tracks "$f" 2:'./2-Death.to.2020.2020.720p.WEBRip.800MB.x264-GalaxyRG.mkv-por.S_TEXT'
# mkvextract tracks "$f" 3:'./3-Death.to.2020.2020.720p.WEBRip.800MB.x264-GalaxyRG.mkv-eng.S_TEXT'
...
</pre></blockquote></HTML>	

==Chapters

* Extract as plain text or xml:

  mkvextract chapters -s $mkvfile | tee $mkvile-chapters.txt
  mkvextract chapters    $mkvfile | tee $mkvile-chapters.xml

* Add or replace chapters:

  mkvpropedit $mkvfile --chapters $mkvile-chapters.txt

* Create chapters file from 2 columns tab-delimited list of timecode and name :
<code>perl -ne 'BEGIN{$fps=24}; $c=sprintf("CHAPTER%02d", $n++);
  ($tc, $name)=split(/\t/);
  $tc =~ s!:(\d\d)$!sprintf(".%03d",$1*1000/$fps)!e;
  print "$c=$tc\n",
    "${c}NAME=$name"' $My_ChaptersList_File
</code>
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