You can't directly change the audio frame rate in Adobe Premiere Pro, as audio uses sample rate instead. However, if you're referring to how Premiere Pro interprets the video frame rate associated with audio and video clips, here's how to do it:
Modifying Interpret Footage to Change Video Frame Rate (Affecting Audio Sync):
Premiere Pro allows you to reinterpret the frame rate of a video clip, which indirectly affects the synchronization of the audio and video within that clip. Here's how:
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Locate the Clip: Find the clip you want to modify in the Project panel (where your imported media is stored).
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Right-Click and Modify: Right-click on the clip. From the context menu, select Modify > Interpret Footage...
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Interpret Footage Window: The Interpret Footage window will open.
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Assume This Frame Rate: In the "Frame Rate" section, select the "Assume this frame rate" option.
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Enter New Frame Rate: Enter the desired frame rate in the field provided. For example, if you shot a clip at 60fps and want Premiere to interpret it as 30fps, enter "30". This will effectively slow down the clip to half speed.
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Click OK: Click "OK" to apply the changes.
Important Considerations:
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Playback Speed and Duration: Changing the interpreted frame rate will alter the playback speed and duration of the clip. For example, if you tell Premiere Pro to interpret a 60fps clip as 30fps, the clip will play back at half speed and its duration will double.
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Audio Synchronization: This process affects both the video and the audio together within that clip. The audio will also slow down or speed up along with the video, maintaining sync.
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Original Media Remains Unchanged: This process only changes how Premiere Pro interprets the clip within your project. The original source media file remains untouched.
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Working with Separate Audio: If you have separate audio files, you might need to adjust their speed/duration independently to match the re-interpreted video. You can do this by right-clicking the audio clip in the timeline and selecting "Speed/Duration".
Why Would You Do This?
- Slow Motion/Speed Effects: Creating slow-motion or time-lapse effects.
- Matching Frame Rates: Correcting discrepancies between the recorded frame rate and the desired project frame rate.
Audio Sample Rate:
Remember that audio itself has a sample rate (e.g., 44.1kHz, 48kHz). This is different from frame rate. You would adjust the audio sample rate when converting the audio file outside of Premiere Pro using a dedicated audio editing program like Adobe Audition. Premiere generally handles different sample rates well, but mismatches can sometimes cause issues.
