diff --git a/management/commands/render.py b/management/commands/render.py
index b4a242c..ba477f0 100644
--- a/management/commands/render.py
+++ b/management/commands/render.py
@@ -16,6 +16,7 @@ class Command(BaseCommand):
         parser.add_argument('--duration', action='store', dest='duration', default="3600", help='target duration of all fragments in seconds')
         parser.add_argument('--offset', action='store', dest='offset', default="1024", help='inital offset in pi')
         parser.add_argument('--no-video', action='store_true', dest='no_video', default=False, help='don\'t render video')
+        parser.add_argument('--chapter', action='store', dest='chapter', default=None, help='chapter')
         parser.add_argument('--single-file', action='store_true', dest='single_file', default=False, help='render to single video')
         parser.add_argument('--keep-audio', action='store_true', dest='keep_audio', default=False, help='keep independent audio tracks')
         parser.add_argument('--stereo-downmix', action='store_true', dest='stereo_downmix', default=False, help='stereo downmix')
diff --git a/render.py b/render.py
index 22a2811..6067ea4 100644
--- a/render.py
+++ b/render.py
@@ -147,16 +147,17 @@ def compose(clips, target=150, base=1024, voice_over=None, options=None):
                 clips = all_clips.copy()
         if length + clip['duration'] > target and length >= vo_min:
             break
-        print('%06.3f %06.3f' % (length, clip['duration']), os.path.basename(clip['original']))
         length += int(clip['duration'] * fps) / fps
 
         # 50/50 original or ai
         src = clip['original']
         audio = clip['original']
-        # select ai...
+        # select ai if we have one
         if 'ai' in clip:
-            if chance(seq, 0.5):
-                src = random_choice(seq, clip['ai'].values(), False)
+            if True or chance(seq, 0.5):
+                src = random_choice(seq, list(clip['ai'].values()), False)
+
+        print('%07.3f %07.3f' % (length, clip['duration']), src.split('/')[-2], os.path.basename(clip['original']))
 
         scene['front']['V2'].append({
             'duration': clip['duration'],
@@ -348,6 +349,8 @@ def render_all(options):
     for fragment in fragments:
         fragment_base += 1
         fragment_id = int(fragment['name'].split(' ')[0])
+        if options["chapter"] and int(options["chapter"]) != fragment_id:
+            continue
         name = fragment['name'].replace(' ', '_')
         if fragment_id < 10:
             name = '0' + name
@@ -404,7 +407,7 @@ def render_all(options):
                     cmd += ['vn=1']
                 else:
                     cmd += ['an=1']
-                    cmd += ['vcodec=libx264', 'x264opts=keyint=1', 'crf=15']
+                    #cmd += ['vcodec=libx264', 'x264opts=keyint=1', 'crf=15']
                 subprocess.call(cmd)
                 if ext == '.wav' and timeline.endswith('audio.kdenlive'):
                     cmd = [