daemon/packager.py

@@ -61,11 +61,19 @@ class Mediasite:
                 slides_path = os.join.path(base, 'slides')
                 os.mkdir(slides_path)
                 mypackage['slides'] = []
+                demux_file = os.join.path(slides_path, 'demux.txt')
+                with open(demux_file, 'w') as f:
                     for slide in data['slides']:
                         myslide = { 'url':      os.join.path(slides_path, self._download(slides_path, slide['url'], session)),
                                     'duration': slide['duration'] }
+                        f.write('file \'{}\'\n'.format(myslide['url']))
+                        f.write('duration {}\n'.format(slide['duration']))
                         mypackage['slides'].append(myslide)
                         
+                    # to accomodate for an ffmpeg quirk that needs the last slide twice
+                    f.write('file \'{}\'\n'.format(mypackage['slides'][-1]['url']))
+                mypackage['demux_file'] = demux_file
+
         return mypackage
 
     def _download(self, base, remotefile, session):

daemon/transcoder.py

@@ -1,6 +1,6 @@
 import logging
 import multiprocessing as mp
-import os
+import oset = True
 import shutil
 import time
 
@@ -66,6 +66,15 @@ class Transcoder:
 
                 pending.append({'jobs': transcodes,
                                 'data': stream})
+                
+                if 'slides' in package:
+                    slides_job = pool.apply_async(_Worker.make_slides_video,
+                                                    (self.worker,
+                                                     package['demux_file'],
+                                                     workbase,
+                                                     maxheight, preset, crf))
+                    
+
             pool.close()
             pool.join()
         self.logger.info("%s - Finished transcoding", package_id)
@@ -148,3 +157,21 @@ class _Worker:
         self.logger.info("%s - Transcoded %s in %s seconds",
                          package_id, outstream, runtime)
         return outstream
+    
+    def make_slides_video(self, package_id, demux_file, outdir, maxheight, preset, crf):
+        self.logger.debug("%s - Preparing slides for processing", package_id)
+        outstream = '{}-{}-{}-{}.mp4'.format('slides', maxheight, preset, crf)
+        outpath = os.path.join(outdir, outstream)
+        self.logger.debug("%s - Building slide video from demux.txt", package_id)
+
+        start = time.time()
+        quiet = True
+        if self.logger.getEffectiveLevel() < logging.INFO:
+            quiet = False
+
+        result, _ = (ffmpeg
+                        .input(demux_file, framerate=25)
+                        .filter('scale', height='min(in_h, {}').format(maxheight, width=-2)
+                        .output(outpath, crf=crf, preset=preset, movflags='faststart', pix_fmt='yuv420p')
+                        .run(quiet=quiet))
+