I scripted it with awk, an old Unix scripting language, available also for Windows. I guess, you can get a Debian awk package.
usage:
awk -f script.awk [video.mkv] [audio-langs-to-keep] [subtitle-langs-to-keep] [keep-chapters]
examples:
keep English and Spain audio, keep French and German subtitles, no chapters
awk -f script.awk video.mkv :eng:spa :fre:ger
keep English audio, no subs, keep the chapters
awk -f script.awk video.mkv :eng "" chapters
keep no audio, no subs but the chapters
awk -f script.awk video.mkv "" "" chapters
Put a colon :
in front of every language code. Some valid codes are:
English language name | ISO639-2 code ----------------------------------------------+--------------- Afrikaans | afr Arabic | ara Australian languages | aus Baltic languages | bat Catalan; Valencian | cat Caucasian languages | cau Chinese | chi Corsican | cos Croatian | hrv Czech | cze Dutch; Flemish | dut English | eng French | fre Georgian | geo German | ger Greek, Modern (1453-) | gre Hebrew | heb Hindi | hin Hungarian | hun Irish | gle Italian | ita Japanese | jpn Javanese | jav Korean | kor Kurdish | kur Norwegian | nor Persian | per Polish | pol Portuguese | por Romanian; Moldavian; Moldovan | rum Russian | rus Serbian | srp Spanish; Castillan | spa Swedish | swe Thai | tha Turkish | tur Ukrainian | ukr Vietnamese | vie Walloon | wln Yiddish | yid
Please set the full PATH
to your MKVToolnix distribution in the variable MKVMerge
.
Attention is needed for the different quoting in Windows and Unix:
Windows
Result=("\""MKVMerge"\" --ui-language en --identify-verbose \""MKVVideo"\"" | getline Line);
Unix(?)
Result=("'MKVMerge' --ui-language en --identify-verbose 'MKVVideo'" | getline Line);
Windows
Result=system("\"" MKVMerge "\" -o \"" NewVideo "\" " CommandLine " \"" MKVVideo "\"")
Unix(?)
Result=system("'MKVMerge' -o 'NewVideo' CommandLine 'MKVVideo'")
If you know another/better/correct Unix quoting, please let me know.
script.awk
BEGIN {
MKVMerge="/bin/MKVMerge" # for Linux
MKVMerge="C:\\Program Files\\mkvtoolnix\\MKVMerge.exe" # for Win32
MKVMerge="C:\\Program Files (x86)\\mkvtoolnix\\MKVMerge.exe" # for Win64
FS="[\t\n: ]"
IGNORECASE=1
MKVVideo=ARGV[1]
AudioKeep=ARGV[2]
SubsKeep=ARGV[3]
ChaptersKeep=ARGV[4]
NewVideo=substr(MKVVideo, 1, length(MKVVideo)-4)".new.mkv"
do {
Result=("\""MKVMerge"\" --ui-language en --identify-verbose \""MKVVideo"\"" | getline Line);
if (Result>0) {
FieldCount=split(Line, Fields)
if (Fields[1]=="Track") {
NoTr++
Track[NoTr, "id"]=Fields[3]
Track[NoTr, "typ"]=Fields[5]
for (i=6; i<=FieldCount; i++) {
if (Fields[i]=="language") Track[NoTr, "lang"]=Fields[++i]
}
}
}
} while (Result>0)
if (NoTr==0) {
print "Error! No tracks found in \""MKVVideo"\"."
exit
} else {print "\""MKVVideo"\":", NoTr, "tracks found."}
for (i=1; i<=NoTr; i++) {
if (Track[i, "typ"]=="audio") {
if (AudioKeep~Track[i, "lang"]) {
print "Keep", Track[i, "typ"], "Track", Track[i, "id"], Track[i, "lang"]
if (AudioCommand=="") {AudioCommand=Track[i, "id"]
} else AudioCommand=AudioCommand","Track[i, "id"]
} else {
print "\tRemove", Track[i, "typ"], "Track", Track[i, "id"], Track[i, "lang"]
}
} else {
if (Track[i, "typ"]=="subtitles") {
if (SubsKeep~Track[i, "lang"]) {
print "Keep", Track[i, "typ"], "Track", Track[i, "id"], Track[i, "lang"]
if (SubsCommand=="") {SubsCommand=Track[i, "id"]
} else SubsCommand=SubsCommand","Track[i, "id"]
} else {
print "\tRemove", Track[i, "typ"], "Track", Track[i, "id"], Track[i, "lang"]
}
}
}
}
if (AudioCommand=="") {CommandLine="-A"
} else {CommandLine="-a "AudioCommand}
if (SubsCommand=="") {CommandLine=CommandLine" -S"
} else {CommandLine=CommandLine" -s "SubsCommand}
if (!ChaptersKeep) CommandLine=CommandLine" --no-chapters"
print "\"" MKVMerge "\" -o \"" NewVideo "\" " CommandLine " \"" MKVVideo "\""
Result=system("\"" MKVMerge "\" -o \"" NewVideo "\" " CommandLine " \"" MKVVideo "\"")
if (Result>1) print "Error "Result" muxing \""MKVVideo"\"!"
}