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# About frame rates

MotionBuilder adopts the native frame rate used in files imported from other software.

If you send a skeleton from 3ds Max to MotionBuilder, MotionBuilder changes its default frame rate of 24 frames per second (FPS) to match the frame rate of the 3ds Max file (30 FPS) when the file is imported into MotionBuilder.

Important MotionBuilder retains the new frame rate (30 FPS) as the default unless you restore it to its native frame rate of 24 FPS.

For example, if you create a 90-frame animation for video, using an NTSC frame rate of 30 frames per second, the result will be three seconds of animation. If you later need to output to PAL video (at 25 frames per second), you can switch to the PAL frame rate. The 90 frames are converted to 75, and produce the same total animation time with a different number of frames. You can later switch back to NTSC frame rate to restore the original 90 frames of animation.

You can change the frame rate for your MotionBuilder output at any time, outputting the correct number of frames to maintain the correct playback speed for your animation, without losing animation data.