4 Replies Latest reply on May 1, 2010 2:54 PM by Steve Grisetti

    Time stretch to slow down motion

    BruceWerto

      I am using Adobe Premiere Elements 7. When I use the time stretch to slow the motion down, my final motion is very "jerky". Any way to smooth that out a bit better?
      Thanks,

      Bruce

        • 1. Re: Time stretch to slow down motion
          the_wine_snob Level 9

          Rather than the Time Stretch Tool, you can also Rt-Click on the Clip and choose Time Stretch there. You should also have a red line above that Clip and will want to Render it (you can limit the Render by the WAB, Work Area Bar). Playback should be smoother then.

           

          What percentage are you slowing down the Clip?

           

          Good luck,

           

          Hunt

          • 2. Re: Time stretch to slow down motion
            BruceWerto Level 1

            I'm talking about the finished DVD motion. Pretty jerky on the finished product. I have it at 42%

            • 3. Re: Time stretch to slow down motion
              the_wine_snob Level 9

              How does the Slo-mo footage look in Preview?

               

              Also remember that you are basically doubling the number of Frames.

               

              This might also be of use for improving the results:

               

              Set field options for imported interlaced video

              In most video, each frame consists of two fields. One  field contains the odd‑numbered lines in the frame, and the other contains the  even‑numbered lines. The fields are interlaced, or  combined, to create the complete image. Adobe Photoshop Elements includes a  reverse field order preset for video imported from a hard disk or Flash memory  camcorder that uses upper fields first. If your footage was captured with  reverse order fields (upper fields first), make sure your project uses either  the Standard or Widescreen preset from the Hard Disk, Flash Memory Camcorders  presets folder. (See Create or change project  presets.)

              Ordinarily, interlacing isn’t apparent to a viewer. But because each field  captures the subject at a slightly different moment in time, playing a clip in  slow-motion, creating a freeze frame, or exporting a frame as a still image  makes the two fields discernible. To avoid this, you can deinterlace the image. Deinterlacing eliminates one field and  either duplicates or interpolates the lines of the remaining field.

              Reversing the field dominance, the order in which the  fields are recorded and displayed, may also cause playback problems. When the  field dominance is reversed, motion appears jerky because the fields no longer  appear in chronological order. Fields can become reversed when the field  dominance of the original videotape is the opposite of the field dominance of  either the video‑capture card used to capture the clip or the video‑editing or  animation software that last rendered the clip. Reversing can also happen when  you set an interlaced clip to play backward.

              To avoid these complications, you can deinterlace the  image. Deinterlacing eliminates one field and either duplicates or interpolates  the lines of the remaining field. You can also set field options for an  interlaced clip so that the clip’s picture and motion quality are preserved in  situations such as changing the clip speed, exporting a filmstrip, playing a  clip backward, or freezing a video frame.

              1. Select a clip in the Timeline, and choose Clip >  Video Options > Field Options.
              2. Select Reverse Field Dominance to change the order in  which the clip’s fields appear. This option is useful when the field dominance  of the clip doesn’t match your equipment or when you play a clip  backward.
              3. For Processing Options, select one of the following  choices, and click OK.
                None
                Does not process the clip’s fields.
                Interlace Consecutive Frames
                Converts pairs of consecutive progressive‑scan (noninterlaced) frames into  interlaced fields. This option is useful for converting 60‑fps progressive‑scan  animations into 30‑fps interlaced video because many animation applications  don’t create interlaced frames.
                Always Deinterlace
                Converts interlaced fields into whole progressive‑scan frames. Adobe  Premiere Elements deinterlaces by discarding one field and interpolating a new  field based on the lines of the remaining field. It keeps the field specified in  the Field Settings option in the Project Settings. If you specified No Fields,  Adobe Premiere Elements keeps the upper field unless you selected Reverse Field  Dominance, in which case it keeps the lower field. This option is useful when  freezing a frame in the clip.
                Flicker Removal
                Prevents thin horizontal details in an image from flickering by slightly  blurring the two fields together. An object as thin as one scan line flickers  because it can appear only in every other field.

              Good luck,
              Hunt

              • 4. Re: Time stretch to slow down motion
                Steve Grisetti Adobe Community Professional

                You can also improve how your slowed down video clip plays by right-clicking on it an applying Frame Blending.

                 

                Some video formats respond to Time Stretch better than others, by the way. By nature of the compression method they use, MPEGs do not go to slow motion as well as AVIs, for instance.