daemon/transcoder.py

@@ -33,10 +33,16 @@ class Transcoder:
             self.logger.debug("%s - Pool created", package_id)
             for stream in package['sources']:
                 transcodes = {}
+                
+                # If the strean is a colection of slide images that has to be converted to a video
                 if 'demux_file' in stream:
                     self.logger.debug("%s - Processing stream %s", package_id, 'slides job in demux.txt')
+
+                    # Create the different variants
                     for maxheight in self.variants:
                         crf, preset = self.variants[maxheight]
+
+                        # Call the _Worker function asyncronously
                         transcodes[maxheight] = pool.apply_async(_Worker.make_slides_video,
                                                         (self.worker,
                                                          package_id,
@@ -47,14 +53,21 @@ class Transcoder:
                     slides_thumb = 'slides_thumb{}'.format(ext)
                     shutil.copy2(stream['poster'],os.path.join(workbase, slides_thumb))
                     stream['poster'] = slides_thumb
+                    
+                    # Remove the reference to the demuxfile since it is no longer needed
                     stream.pop('demux_file')
                 
+                # If the strean is a regualr video it needs to be transcoded with new resolution
                 elif 'video' in stream:
                     streampath_rel = stream['video']
                     streampath_abs = os.path.join(base, streampath_rel)
                     self.logger.debug("%s - Processing stream %s", package_id, streampath_rel)
+
+                    # Create the different variants
                     for maxheight in self.variants:
                         crf, preset = self.variants[maxheight]
+
+                        # Call the _Worker function asyncronously
                         transcodes[maxheight] = pool.apply_async(_Worker.transcode,
                                                     (self.worker,
                                                      package_id,
@@ -77,9 +90,11 @@ class Transcoder:
                                                      workbase))
                         transcodes['poster'] = thumbjob
 
+                # Store the jobs and streams in the pending array 
                 pending.append({'jobs': transcodes,
                                 'data': stream})
 
+            # Close the pool
             pool.close()
             pool.join()
         self.logger.info("%s - Finished transcoding", package_id)
@@ -90,6 +105,7 @@ class Transcoder:
             jobs = item['jobs']
             streams = {}
             for maxheight in self.variants:
+                # Get the jobs. If not done wait until they are ready.
                 streams[maxheight] = jobs[maxheight].get()
             stream['video'] = streams
             if 'poster' in jobs:
@@ -98,6 +114,7 @@ class Transcoder:
                 package['thumb'] = stream['poster']
             package['sources'].append(stream)
 
+        # Return the finished streams
         return package
 
 class _Worker: