MKV DTS to AC3 Converter - Strips DTS streams

#!/usr/bin/python
# -*- coding: utf8 -*-
# This script converts all DTS streams inside an MKV to AC3 and adds them to the MKV file
# The newly generated MKV is stored in the target directory
# Import module OS
import os, sys

param_count = len(sys.argv)

# Print commandline if not enough parameters are given
if param_count < 2:
  print "mkvdts@ac3 - The DTS / DTS-HD to AC3 converter"
  print
  print "Usage: mkvdts@ac3 /path/to/my.movie.mkv  /path/to/output/"
  quit()

# Get source MKV from MKV
source_mkv = sys.argv[1]

# Get target directory from CLI
target_dir = sys.argv[2]

# Get track information of source MKV
tracks = os.popen ("mkvmerge -i " + source_mkv )

# Check for existence of DTS streams
check_DTS = os.popen ("mkvmerge -i " + source_mkv + " \| grep DTS")

print check_DTS

quit()

track_count = 1

ac3_tracks = []

# Loop through all tracks
for track in tracks:
  # Only process strings with "Track ID" in them
  if track.find ('Track ID') <> -1:
    # Remove whitespaces
    track = track.strip()

    if track.find ('A_DTS') <> -1:
      extension = 'dts'
      # Extract DTS / DTS-HD stream from MKV
      extract_command = "nice -n 19 ionice -c3 mkvextract tracks " + source_mkv + " " + str (track_count) +":/tmp/Track_" + str (track_count) + "." + extension
      print extract_command
      os.popen ( extract_command )
      # Convert DTS / DTS-HD stream to 6 channel AC3
      convert_command = "nice -n 19 ionice -c3 ffmpeg -i " + "/tmp/Track_" + str (track_count) + "." + extension + " -acodec ac3 -ac 6 -ab 448k -y /tmp/Track_" + str (track_count) + ".ac3"
      print convert_command
      os.popen ( convert_command )

      # Remember generated AC3 stream for later remuxing
      ac3_tracks.append ("/tmp/Track_" + str (track_count) + ".ac3")

      # Clean up converted DTS / DTS-HD stream
      os.remove ("/tmp/Track_" + str (track_count) + "." + extension)

    # Increase track count
    track_count = track_count + 1

cl = ""

# Generate list of all available AC3 files for remux
for ac3_track in ac3_tracks:
  cl = cl + " " + ac3_track

# Target MKV = source MKV filename plus output path
target_mkv = target_dir + os.path.basename(source_mkv)

# Merge generated AC3 streams with old MKV to new MKV
command = "mkvmerge -o " + target_mkv + " " + source_mkv + " " + cl
print command
os.popen (command)

# Clean up temporary generated AC3 tracks
for ac3_track in ac3_tracks:
  os.remove (ac3_track)