After Effects: Changing Frame Input and Output Rates
Adobe after effects allows editors to manipulate the frame rate when importing and exporting video. These manipulations can be done in either the Project Panel or Composition tab. Just by learning a few simple steps, even beginners will be able to use these tools in After Effects.
Step 1: Using Frame Rate
Frame rate determines how many frames will be played per second and how time will be divided up between these frames in both the time display and ruler. Frame rates should match the output that the user is trying to achieve. For example, to create a NTSC video, the frame rate would be 29.97 frames per second (fps). For someone creating a major motion picture, that rate would be 24 fps.
After Effects gives editors the ability to set the frame rate for images being imported into it and for the final video output. The program also allows users to give each piece of footage its own frame rate.
But, generally, the goal should be to set the clip’s frame rate to the same frame rate as the final output. This ensures that clips are not duplicated, deleted or interpolated, which could make for some sloppy looking video sequences.
Step 2: Conforming the Frame Rate
If the input footage does not match the output footage, this can be fixed by conforming the frame rate. Basically, this means that the footage being imported can be changed to match the output frame rate.
When changing the frame rate for a clip, it does not change the source file. It only changes the speed of the current clip.
To change the frame rate for a single clip to make it conform to the output frame rate, go into the Project Panel and select Interpret Footage. Go to File and then Interpret Footage. Then, go into the Main screen.
Click on the Conform to Frame Rate. Next, enter what the frame rate should be and then select OK.
Step 3: Interpreting the Footage
When a piece of footage is imported, usually the default frame rate is 30 fps for still images. This, however, can be changed by interpreting the footage. To use the Interpret Footage tool, select a clip. Go into the Project panel and select the Interpret Footage button.
Now, the frames per rate can be changed.
Step 4: Change the Frame Rate for an Entire Sequence
As mentioned earlier, After Effects has its own set of presets for importing clips and stills. Frame rates, however, can be changed at any time by going into the Composition Settings and manipulating the presets.
If an entire sequence needs to be changed, this can be done by manipulating the Composition Settings. To do this, go into the Composition panel and select Composition Settings. In this menu, editors have two choices. They can either select another preset from the Preset menu or they can create their own Frame Rate value.
Here, the sequence can be set to the final output frame rate or the entire sequence can be changed to the frame rate for the source file.