diff --git a/deportfolio.sh b/deportfolio.sh
new file mode 100644
index 0000000..2e6385a
--- /dev/null
+++ b/deportfolio.sh
@@ -0,0 +1,3 @@
+# Helper for unfucking Adobe's stupid Portfolios
+# TODO: Currently only merges, can we automatically extract?
+pdftk $(ls -1v) cat output $1
diff --git a/lecturemunger.py b/lecturemunger.py
index 48b1ca3..6dd3dfd 100644
--- a/lecturemunger.py
+++ b/lecturemunger.py
@@ -115,53 +115,54 @@ def do():
         print("Using destreamer.js at {}".format(path_to_destreamer))
         call("node --max-http-header-size 32768 {} --skip -k -o {} -i {}".format(path_to_destreamer, downloaded, " ".join(urls)), shell=True)
         for entry in os.scandir(downloaded):
-            # Normalise names
             # Put file extension to one side for safekeeping
             split = entry.name.split('.')
             extension = split[1]
-            name = split[0].replace(',', '').split('#')[0] # Discard all commas, and unique id doodad
-            head, sep, tail = name.partition(' ') # Discard leading date
-            split2 = tail.split()
-            date = dparser.parse(split2[-1], fuzzy=True) # Parse the date
-            folder_path = split2[0] + split2[1] # TODO Fragile
-            title = re.search(r'\d+-\d+\s[\d\w\s]*', tail)
-            if re.match:
-                title = title.group(0).strip().replace(' ', '_')
-                # Add date back
-                if date is not None:
-                    title += "_" + date.strftime('%Y-%m-%d')
-                # Rename file
-                source = entry.path
-                filename = "{}.{}".format(title, extension)
-                dest = os.path.abspath(renamed + "/" + filename)
-                print ("Source: " + source)
-                print ("Dest: " + dest)
-                shutil.copy(source, dest)
-                time.sleep(5)
-                # Extract audio, process it, add it back to the video
-                video_in = dest
-                processed_audio = os.path.join(processed_audio_dir, filename.split(".")[0] + ".wav")
-                final_output_name = os.path.join(final, filename.split(".")[0] + ".mp4")
-                do_command("New:")
-                do_command("Import2: Filename={}".format(video_in))
-                time.sleep(5)
-                do_command("SelectAll:")
-                do_command('Amplify: Ratio=2')
-                time.sleep(1)
-                do_command("SelectAll:")
-                do_command('Popmute: thresh=10 floor=100')
-                time.sleep(1)
-                do_command("Export2: Filename={} NumChannels=2".format(processed_audio))
-                time.sleep(5)
-                do_command("SelectAll:")
-                do_command("RemoveTracks:")
-                time.sleep(5)
-                # do_command('Close:') TODO THis causes audacity to wait for a input
-                # final_output_name = "output-" +
-                # TODO Folderisation of output by lecture
-                print("Combining video at {} with audio at {}".format(video_in, processed_audio))
-                # https://superuser.com/questions/277642/how-to-merge-audio-and-video-file-in-ffmpeg
-                call('ffmpeg -i {} -i {} -acodec copy -vcodec copy -map 0:v:0 -map 1:a:0 {}'.format(video_in, processed_audio, final_output_name), shell=True)
-                print("\033[92mDone! Result is at {}\e[0m".format(final_output_name))
+            if str(extension) == "mkv":
+                # Normalise names
+                name = split[0].replace(',', '').split('#')[0] # Discard all commas, and unique id doodad
+                head, sep, tail = name.partition(' ') # Discard leading date
+                split2 = tail.split()
+                date = dparser.parse(split2[1], fuzzy=True) # Parse the date
+                folder_path = split2[0] + split2[1] # TODO Fragile
+                title = re.search(r'\d+-\d+\s[\d\w\s]*', tail)
+                if re.match:
+                    title = title.group(0).strip().replace(' ', '_')
+                    # Add date back
+                    if date is not None:
+                        title += "_" + date.strftime('%Y-%m-%d')
+                    # Rename file
+                    source = entry.path
+                    filename = "{}.{}".format(title, extension)
+                    dest = os.path.abspath(renamed + "/" + filename)
+                    print ("Source: " + source)
+                    print ("Dest: " + dest)
+                    shutil.copy(source, dest)
+                    time.sleep(5)
+                    # Extract audio, process it, add it back to the video
+                    video_in = dest
+                    processed_audio = os.path.join(processed_audio_dir, filename.split(".")[0] + ".wav")
+                    final_output_name = os.path.join(final, filename.split(".")[0] + ".mkv")
+                    do_command("New:")
+                    do_command("Import2: Filename={}".format(video_in))
+                    time.sleep(5)
+                    do_command("SelectAll:")
+                    do_command('Amplify: Ratio=2')
+                    time.sleep(1)
+                    do_command("SelectAll:")
+                    do_command('Popmute: thresh=10 floor=100')
+                    time.sleep(1)
+                    do_command("Export2: Filename={} NumChannels=2".format(processed_audio))
+                    time.sleep(5)
+                    do_command("SelectAll:")
+                    do_command("RemoveTracks:")
+                    time.sleep(5)
+                    # do_command('Close:') TODO THis causes audacity to wait for a input
+                    # final_output_name = "output-" +
+                    # TODO Folderisation of output by lecture
+                    print("Combining video at {} with audio at {}".format(video_in, processed_audio))
+                    # https://superuser.com/questions/277642/how-to-merge-audio-and-video-file-in-ffmpeg
+                    call('ffmpeg -i {} -i {} -acodec copy -vcodec copy -map 0:v:0 -map 1:a:0 {}'.format(video_in, processed_audio, final_output_name), shell=True)
+                    print("\033[92mDone! Result is at {}\e[0m".format(final_output_name))
         print("Munging complete!!!")
 do()