diff --git a/src/ffx/ffx.py b/src/ffx/ffx.py
index 94fd0ce..27fde19 100755
--- a/src/ffx/ffx.py
+++ b/src/ffx/ffx.py
@@ -186,7 +186,7 @@ def unmux(ctx,
                 
                 if trackDescriptor.getType() == TrackType.SUBTITLE or not subtitles_only:
 
-                    # SEASON_EPISODE_STREAM_LANGUAGE_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
+                    # SEASON_EPISODE_STREAM_LANGUAGE_DISPOSITIONS_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
                     targetPrefix = f"{targetLabel}{targetIndicator}_{trackDescriptor.getIndex()}_{trackDescriptor.getLanguage().threeLetter()}"
 
                     td: TrackDisposition
diff --git a/src/ffx/media_descriptor.py b/src/ffx/media_descriptor.py
index 47da9b7..d4bb69a 100644
--- a/src/ffx/media_descriptor.py
+++ b/src/ffx/media_descriptor.py
@@ -29,7 +29,9 @@ class MediaDescriptor:
     #407 remove as well
     EXCLUDED_MEDIA_TAGS = ["creation_time"]
 
-    SEASON_EPISODE_STREAM_LANGUAGE_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
+    SEASON_EPISODE_STREAM_LANGUAGE_DISPOSITIONS_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
+    STREAM_LANGUAGE_DISPOSITIONS_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
+
     SUBTITLE_FILE_EXTENSION = 'vtt'
 
     def __init__(self, **kwargs):
@@ -396,27 +398,33 @@ class MediaDescriptor:
 
     def searchSubtitleFiles(self, searchDirectory, prefix):
 
-        sesl_match = re.compile(MediaDescriptor.SEASON_EPISODE_STREAM_LANGUAGE_MATCH)
+        sesld_match = re.compile(f"{prefix}_{MediaDescriptor.SEASON_EPISODE_STREAM_LANGUAGE_DISPOSITIONS_MATCH}")
+        sld_match = re.compile(f"{prefix}_{MediaDescriptor.STREAM_LANGUAGE_DISPOSITIONS_MATCH}")
 
         subtitleFileDescriptors = []
+
         for subtitleFilename in os.listdir(searchDirectory):
             if subtitleFilename.startswith(prefix) and subtitleFilename.endswith(
                 "." + MediaDescriptor.SUBTITLE_FILE_EXTENSION
             ):
-                sesl_result = sesl_match.search(subtitleFilename)
-                if sesl_result is not None:
+
+                sesld_result = sesld_match.search(subtitleFilename)
+                sld_result = None if not sesld_result is None else sld_match.search(subtitleFilename)
+                
+                if not sesld_result is None:
+
                     subtitleFilePath = os.path.join(searchDirectory, subtitleFilename)
                     if os.path.isfile(subtitleFilePath):
 
                         subtitleFileDescriptor = {}
                         subtitleFileDescriptor["path"] = subtitleFilePath
-                        subtitleFileDescriptor["season"] = int(sesl_result.group(1))
-                        subtitleFileDescriptor["episode"] = int(sesl_result.group(2))
-                        subtitleFileDescriptor["index"] = int(sesl_result.group(3))
-                        subtitleFileDescriptor["language"] = sesl_result.group(4)
+                        subtitleFileDescriptor["season"] = int(sesld_result.group(1))
+                        subtitleFileDescriptor["episode"] = int(sesld_result.group(2))
+                        subtitleFileDescriptor["index"] = int(sesld_result.group(3))
+                        subtitleFileDescriptor["language"] = sesld_result.group(4)
 
                         dispSet = set()
-                        dispCaptGroups = sesl_result.groups()
+                        dispCaptGroups = sesld_result.groups()
                         numCaptGroups = len(dispCaptGroups)
                         if numCaptGroups > 4:
                             for groupIndex in range(numCaptGroups - 4):
@@ -427,6 +435,29 @@ class MediaDescriptor:
 
                         subtitleFileDescriptors.append(subtitleFileDescriptor)
 
+                if not sld_result is None:
+
+                    subtitleFilePath = os.path.join(searchDirectory, subtitleFilename)
+                    if os.path.isfile(subtitleFilePath):
+
+                        subtitleFileDescriptor = {}
+                        subtitleFileDescriptor["path"] = subtitleFilePath
+                        subtitleFileDescriptor["index"] = int(sld_result.group(1))
+                        subtitleFileDescriptor["language"] = sld_result.group(2)
+
+                        dispSet = set()
+                        dispCaptGroups = sld_result.groups()
+                        numCaptGroups = len(dispCaptGroups)
+                        if numCaptGroups > 2:
+                            for groupIndex in range(numCaptGroups - 2):
+                                disp = TrackDisposition.fromIndicator(dispCaptGroups[groupIndex + 2])
+                                if disp is not None:
+                                    dispSet.add(disp)
+                        subtitleFileDescriptor["disposition_set"] = dispSet
+
+                        subtitleFileDescriptors.append(subtitleFileDescriptor)
+
+
         self.__logger.debug(f"searchSubtitleFiles(): Available subtitle files {subtitleFileDescriptors}")
 
         return subtitleFileDescriptors
@@ -450,7 +481,8 @@ class MediaDescriptor:
                 [
                     d
                     for d in availableFileSubtitleDescriptors
-                    if d["season"] == int(season) and d["episode"] == int(episode)
+                    if ((season == -1 and episode == -1)
+                        or (d["season"] == int(season) and d["episode"] == int(episode)))
                 ],
                 key=lambda d: d["index"],
             )