Synchronization between Video and UI/Image editor.
Open, IncompletePublic


System imformation :
Computer ASUS Desktop PC P30AD
Graphics card: VGA compatible controller: Intel Corporation 4th Generation Core Processor Family Integrated Graphics Controller (rev 06)
Processor 4 Intel Core i3-4160 CPU @ 3,60 Ghz
Memory : 3914 MB
OS : Ubuntu 16.04.2 LTS

Blender version: Blender 2.78 c (downloaded from Ubuntu Software centre)

Description of the error:
The problem I describe here is a problem I have with all the videos I shot with my Panasonic Camcorder HC-VX870.
In the video I used, I wanted to blur a ship floating on the river Seine. Fro some reasons, I cannot get full synchronization between the Video window (right side of my screen) and the
U/I Image editor (left side of my screen).

Specifications s of the video :
Duration : 1 minute 24 seconds
Container : Quicktime
Video :
Dimensions : 3840 x 2160
Codec : H.264 (High profile)
Frame rate : 25 fps
Bit rate : 61128 kbps
Audio :
Codec : MPEG4-AAC
Channels : Stereo
Sample rate : 48000 Hz
Bit rate : 256 kbps
Media details
Demuxer : lavfpref

What I did,
For each step, only what I describe is is happening in the mentioned window (e.g. step 4: things are happening in the Upper left-side window).

Step 1 : I add the video. It appears in the Upper-right side window. OK.

Step 2 : I open the UV Image Editor in the Upper-left side window . OK.
Step 3 : I create my mask (upper-ledt side window). I call it Blur_01. OK.
Step 4 : In the Upper-left side window, I open the video. It appears. OK. No sinc yet.

Step 5 : In the Upper-left side window, I select View/Properties, in order to sync the left side and right side.
Step 6 : In the Upper-left side window, I now tick the Match movie length and Auto Refresh boxes… and the video disappears (or, with some other videos I tried with, the video freezes on some frame).

As a work-around, I converted another of one of my mp4 videos (4692 frames) into a sequence of 4692 PNG images. I managed to get full sync between the upper-right and left windows and to blur the areas I wanted to blur (i.e; Create mask, applying absolute mode, and make it move around and follow the movements of the object I wanted to blur.)

I also tried on Blender 2,76. I managed to move my mask around in the UV Image Editor, then I ended up with two cases :

  • If I start from image 1 (say image 1 to image 50), everything seems to work fine and I manage to get full sync (i.e. the mask moves around nicely in both windows).
  • If I start from another image (say image 51 to 100), then I cannot get the sync and, while the mask moves around in the Upper-left side window, it stays stuck at image 51 in the Upper -right side window.

Thanking you for your attention and your efforts.


Bastien Montagne (mont29) triaged this task as "Incomplete" priority.Wed, Jul 19, 10:46 AM

Difficult to help really without a simple .blend file to reproduce the issue, but two things to check:

  1. Did you enabled AV-sync synchronization mode in TimeLine editor's header bar?
  2. Did you generate valid timecode for your video?