Fix first playback not working

frame_opencv.py

@@ -404,7 +404,7 @@ def export_animation(input_filename, export_filename):
 
 def main(args):
 
-    global onionskin, playback, loop_playback, playhead, index, img_list
+    global onionskin, playback, loop_playback, playhead, index, img_list, first_playback
     
     if not testDevice(0):
         print(_("No camera device found. Exiting..."))
@@ -491,11 +491,15 @@ def main(args):
         time.sleep(.5)
     loop_delta = 0
     while True:
+        print(first_playback)
         start = timer()
         if playback:
             if onionskin:
                 onionskin = False
                 onionskin_was_on = True
+            if first_playback:
+                playhead = 0
+                first_playback = False
             # Play all frames
             if playhead < len(img_list)-1:
                 playhead, img = next_frame(playhead, loop_playback)
@@ -508,6 +512,7 @@ def main(args):
             else:
                 playhead = index
                 img = update_image(img_list, index)
+                first_playback = True
                 playback = False
                 # Restore onionskin
                 if 'onionskin_was_on' in locals():
@@ -642,6 +647,7 @@ img_list = []
 savepath = get_session_folder()
 onionskin = project_settings['onion_skin_onstartup']
 playback = False
+first_playback = True
 playhead = 0
 loop_playback = True
 blank_image = generate_text_image(_("No images yet! Start shooting..."), project_settings['screen_w'], project_settings['screen_h'])