Realtime speed control

One of the most often-used special effects is slow motion. With RT2500, slow motion can be achieved in real time through the process of repeating full frames (realtime accelerated motion can also be performed in a similar manner). Matrox designed RT2500 to do frame-based speed changes in real time. This can be very useful for setting the pace of your project and seeing how the effect looks on a particular clip.

Speed is the playback rate of the clip on the Timeline, compared to the rate at which it was recorded. A speed change can either cause frames to be repeated (slow motion) or dropped (accelerated motion).

1. Drag a video clip onto the Timeline

   Start Adobe Premiere and import any video clip. Drag this clip onto track Video 1A.

   
2. Change the speed of the clip

   Select the clip you just added to the Timeline and do one of the following:

   • To change the speed numerically, choose Clip > Speed from the Adobe Premiere menu. Type a percentage or a new duration, and click OK. Values below 100% will create a slow motion effect. Values above 100% will create a fast motion effect.
     TIP: You can use the keyboard shortcut Ctrl+Shift+R.
   • To change the speed visually, select the Rate Stretch tool and drag either end of the clip to make the clip play slower or faster.
3. Preview your effect in real time

   Press the Play button in the Monitor window or press the Enter key on your keyboard to preview your speed change in real time.

Expert tip

You can render field-based speed changes for the smoothest results by applying one of Premiere's field processing options. To do this, right-click your clip, then choose Video Options > Field Options. You can experiment with Always deinterlace and Flicker removal to see which gives you the best results. When using field-based speed changes for your final export on today's high performance systems, rendering to create ultra-smooth speed control is a fast process.