pp-mkvmerge

#!/usr/bin/env python
import os
import sys
import re

language = 'eng' # 3 letters, lower case!


def handlemkv(mkvfilename):
    print mkvfilename
    # find Audio streams
    # ffmpeg -i *.mkv 2>&1 | grep -i -e Audio:
    # Example output:
    #    Stream #0:1(ger): Audio: ac3, 48000 Hz, stereo, fltp, 224 kb/s (default)
    #    Stream #0:2(jpn): Audio: ac3, 48000 Hz, stereo, fltp, 224 kb/s
    cmd = 'ffmpeg -i "' + mkvfilename + '" 2>&1 | grep -i -e Audio:'
    print "cmd is", cmd
    streamnumber = -1
    for thisline in os.popen(cmd).readlines():
        print thisline.rstrip()
        if thisline.find(language)>=0:
            try:
                # streamnumber = thisline.split(':')[1].split('(')[0]
                streamnumber = re.findall(r"[\w']+", thisline)[2]
                print "Stream number", streamnumber
                streamnumber = int(streamnumber)    # force it to be an integer so we know we found correct info
            except:
                print "Something went wrong with find the stream number. Please report with logfile"
                sys.exit(0)
            break
    if streamnumber >= 0:
        print "Language found in stream", streamnumber
    else:
        print("Language %s not found" % (language))
        return()
    print "Go on"

    # leave only one audio stream, remove all subs
    # mkvmerge -o new2.mkv -a 1 --nosubs movie-Ger-Jap-Dub.mkv
    directory, filename = os.path.split(mkvfilename)
    cleanmoviename = os.path.join(directory, "cleanedmovie.mkv")
    print "cleanmoviename", cleanmoviename
    cmd = 'mkvmerge -o "' + cleanmoviename + '" -a ' + str(streamnumber) + '  --delete-attachment ' + --edit track:v1 + ' --delete name + ' --edit track:a1 + ' --delete name + ' --edit track:s1 + ' --delete name "' + mkvfilename + '"'
    print "command is", cmd
    for thisline in os.popen(cmd).readlines():
        print thisline.rstrip()

    # Delete original mkv, rename new one to original name and chmod it
    print "Cleaning up"
    os.remove(mkvfilename)
    os.rename(cleanmoviename, mkvfilename)
    os.chmod(mkvfilename, 0775)



try:
    root = sys.argv[1]
except:
    print "Define directory on the commandline"
    sys.exit(1)

print("Language %s to be kept" % (language))

print "Searching:", root
for path, subdirs, files in os.walk(root):
    for name in files:
        fullname = os.path.join(path, name)
    if os.path.splitext(fullname)[1].lower() == '.mkv':
        print "Found mkv", fullname
        handlemkv(fullname)