Compressor 4 - Using the Retiming Controls

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Using the Retiming Controls

The retiming controls have two common uses.

Converting video from one frame rate to another: This typically involves converting NTSC

to PAL frame rates or PAL to NTSC frame rates. This function uses only the setting of
the Rate Conversion pop-up menu and is automatically configured when necessary.

Converting video to a new speed: This can be a matter of playing the existing frames at

a different rate or, in the case of slow-motion effects, it can require generating
intermediate frames.

In all cases, if the source media file contains audio, the audio also has its speed changed,
with the audio pitch corrected so that it sounds the same as the original, just at a different
speed. This ensures that you will maintain sync between the video and audio.

If you preview a setting that uses retiming controls, the video will play at its new frame
rate or speed, but it will not have been processed by Frame Controls and will be of a
lower quality than the actual transcoded output file will be. The audio is pitch corrected
when the setting is previewed.


Chapter 23

Working with Frame Controls

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If you are using retiming controls on a setting using the QuickTime Movie

output format and choose “Pass-through” for the audio setting, the audio does not have
its speed changed and will not maintain sync with the video. See

About the QuickTime

Movie Encoder Pane

for more information.