2 Replies Latest reply on Nov 1, 2013 5:20 AM by Steve Grisetti

    Jerks on still image motion in .m2t exported file

    duduche_1024

      With Premiere Elements 9.0.1 in HD1080i, export in MPEG2 1920x1080i 25 (all in standard configuration) under Windows7 - 64bits

       

      In the AVCHD (.m2t) exported file appears some jerks when there is a motion on a still image.

      This image is a map (.png 4080x4080 at scale 1) which I move to show a travel.

      Explanation of "jerks" :  when looking more closely, it appears that at each frame the picture moves regularly (7 pixels for instance), then for one frame doesn't move, then for the next one moves twice ( 14 pixels), which gives one "jerk" when watching the video.

       

      In my project the map moves about 10 times : 9 times there are many jerks, only once it's perfectly smooth (zero jerk).

       

      After many tests it appears clearly that the jerks repeat on a period of 12 frames = GOP value (if GOP is changed, period change accordingly)

      When the movement is smooth, the speed of this movement (= in number of pixels at each frame) is a multiple of 2.6666 (=8/3) !!!

       

      The following sheet gives all the tests in detail, if it could help someone to understand something.

      https://files.acrobat.com/preview/83eb613f-7d3a-4c49-b1bf-870aaba13127

       

      What could be done to solve that ?

        • 1. Re: Jerks on still image motion in .m2t exported file
          Steve Grisetti Adobe Community Professional

          First, I'd recommend you reduce that photo size to 2000x1500 pixels. You'll get less of the jiggliness because it will be closer to the resolution of the video (which is 1920x1080).

           

          Then, ensure that your project settings are set for 1920x1080. You can check this under the Edit menu.

           

          If your project is not set up for 1920x1080, you'll need to restart your project. Version 9 does not let you change project settings mid-project. When you start a new project, be sure to select a project preset like Full AVCHD 1920x1080.

           

          Finally, right-click on your photo on your timeline and select Field Options, and set your Field Options for Flicker Removal.

           

          Then, just for good measure, right-click on the photo again on your timeline and make sure the Frame Blending is checked.

           

          As for your output, what do you plan to use your output for? To burn a BluRay disc? To post to Youtube? To use in another project? Your final use will determine what the best output option is -- and certainly may NOT be AVCHD M2T.

          • 2. Re: Jerks on still image motion in .m2t exported file
            Steve Grisetti Adobe Community Professional

            I see that you've already got this topic going in another thread.

             

            Please don't start more than one thread with the same topic.

             

            I'm going to lock this thread to avoid any further confusion. Please continue this discussion in your first thread.

            http://forums.adobe.com/thread/1323576?tstart=0