How to Fix Premiere Pro Stuck on Rendering Required Audio Files

If Premiere Pro’s progress bar has frozen at “Rendering Required Audio Files,” you are not alone. This is one of the most common playback and export blockers editors encounter, and it is almost always fixable within a few minutes. The fixes below are ordered from the quickest to the most involved. Work through them in sequence and test after each step.

Why Premiere Pro Gets Stuck on Rendering Required Audio Files

Premiere Pro pre-renders audio in the background to ensure smooth timeline playback. The progress bar typically completes quickly, but it can stall when something disrupts that process. The most common causes are corrupted conformed audio cache files (.cfa and .pek), a scratch disk that is full or unavailable, insufficient RAM, or a conflicting third-party VST or AU plugin applied to an audio track. Identifying the exact cause before trying fixes is rarely necessary – the ordered list below covers all of them efficiently.

Fix 1 - Clear the Media Cache (Most Common Solution)

Corrupted .cfa (conformed audio) and .pek (waveform peak) files are responsible for the stuck rendering bar in the majority of cases. Premiere Pro builds these files the first time it processes a media clip, and when they become corrupt, the render process loops or hangs indefinitely. Clearing the cache forces Premiere to rebuild them cleanly.

1. Steps to clear the cache through Preferences:

1. Go to Edit > Preferences > Media Cache on Windows, or Premiere Pro > Preferences > Media Cache on macOS.

   

2. Click Delete next to “Remove Media Cache Files.”

3. In the dialog that appears, select Delete all media cache files and confirm.

   

4. Close and reopen your project.

   

   

2. If the issue persists, delete the cache folder manually:

1. Close Premiere Pro completely.

   

2. Navigate to the cache folder:

• Windows:C:\Users\[YourUsername]\AppData\Roaming\Adobe\Common\Media Cache Files

• macOS:/Users/[YourUsername]/Library/Application Support/Adobe/Common/Media Cache Files

3. Delete the contents of the folder (not the folder itself).

   

4. Relaunch Premiere Pro and reopen the project.

   

Note: After clearing the cache, Premiere Pro will re-conform your audio files the next time the project is opened. This is completely normal and may take a few minutes depending on the size and complexity of your project.

Fix 2 - Disable Background Rendering

Background rendering quietly pre-renders the timeline while you work. When media files are still being processed or Premiere’s rendering pipeline is in a conflicted state, this feature can trigger a loop that keeps the progress bar frozen.

Steps:

1. In the menu bar, go to Sequence and uncheck Render Audio if it is currently enabled.

   

2. Open Preferences: Edit > Preferences > Memory (Windows) or Premiere Pro > Preferences > Memory (macOS) and toggle off background rendering.

   

3. Close Preferences and wait 30 seconds.

4. Re-enable background rendering, then play back your timeline to test.

Pro Tip: Toggling background rendering off and back on often resets a stuck render state on its own. Try this before moving to more involved fixes – it takes under a minute.

Fix 3 - Check and Reassign the Scratch Disk

Premiere Pro writes rendered audio preview files to the designated scratch disk location. If that location is full, disconnected, mapped to a network drive, or pointing to a slow external drive, rendering can hang indefinitely.

Steps:

1. Go to File > Project Settings > Scratch Disks.

   

2. Check the paths listed under Audio Previews and Video Previews.

   

3. If the listed location is a network drive, external USB drive, or a nearly full volume, click the dropdown and select Same as Project or redirect to a fast local drive.

   

4. Confirm the selected drive has at least 10 GB of free space – more is better for long or complex projects.

   

5. Save the project and attempt to render again.

   

Note: Avoid setting your scratch disk to a USB 2.0 drive or any network-mapped location. Both are too slow and too unreliable for Premiere’s audio pre-render process and are a frequent cause of this specific hang.

Fix 4 - Re-conform Audio Files Manually

Sometimes corrupted .cfa files are not fully caught or removed by the standard cache clean in Preferences. Forcing Premiere Pro to re-conform audio from scratch is the next step.

Option A: Use Render and Replace in the timeline

1. Press Ctrl+A (Windows) or Cmd+A (macOS) to select all clips on the timeline.

   

2. Go to Clip > Audio Options > Render and Replace, or right-click the selected clips and choose Render and Replace.

   

3. Confirm the settings in the dialog and click OK.

4. Premiere Pro will replace the audio references with freshly rendered audio files.

   

Option B: Delete .cfa files manually from the cache folder

1. Close Premiere Pro completely.

   

2. Navigate to the media cache folder (paths listed in Fix 1 above).

3. Search for all files with the .cfa extension and delete them.

   

4. Reopen Premiere Pro and your project. Premiere will re-conform all audio on load.

   

Note: Option B is more thorough than the in-app cache delete when working with large projects that have accumulated cache files across multiple sessions.

Fix 5 - Disable Third-Party Audio VST Plugins

Incompatible or improperly licensed VST and AU plugins applied to audio tracks can freeze the render pipeline. This is a less common cause, but it is worth checking if the previous fixes did not resolve the issue.

Steps:

1. Open the Audio Track Mixer via Window > Audio Track Mixer.

   

2. Locate any third-party effects applied to your audio tracks and click the bypass button on each to disable them.

   

3. Attempt to render. If the render completes, a plugin is the culprit.

   

4. Re-enable effects one at a time, rendering between each activation, to isolate the offending plugin.

   

   

5. Once identified, check the developer’s website for an update compatible with your Premiere Pro version, or remove the plugin from the project.

   

Alternative approach: Temporarily rename or move your VST plugins folder so Premiere Pro cannot load any third-party plugins on launch, then test the render in a clean plugin environment.

Fix 6 - Free Up RAM and Close Background Applications

Premiere Pro’s audio rendering is memory-intensive, and low available RAM can cause the progress bar to stall mid-process.

• Open Edit > Preferences > Memory (Windows) or Premiere Pro > Preferences > Memory (macOS) and increase the amount of RAM allocated to Premiere Pro.

  

• Close browsers, streaming apps, Slack, and any other background applications before attempting to render.

• On machines with 16 GB of RAM or less, this step can make a noticeable difference in rendering stability.

  

Fix 7 - Update or Reinstall Adobe Premiere Pro

Adobe regularly patches known rendering bugs in Premiere Pro updates. If you are running an older version, an update alone can resolve a persistent rendering hang.

1. Open the Creative Cloud Desktop app.

   

2. Navigate to Apps > Premiere Pro and install any available updates.

   

3. Retest after updating.

   

If updating does not help and all previous fixes have failed:

1. Use Creative Cloud Desktop to uninstall Premiere Pro.

   

2. Manually remove residual folders:

• Windows:AppData\Roaming\Adobe\Premiere Pro

  

• macOS:~/Library/Application Support/Adobe/Premiere Pro

3. Reinstall Premiere Pro through Creative Cloud.

   

Note: A full reinstall should be treated as a last resort. It is time-consuming and rarely necessary if the earlier fixes have been followed correctly.

How to Prevent This Issue in the Future

• Clear the media cache regularly – either monthly or at the start of each new project, via Preferences > Media Cache.

• Keep your scratch disk on a fast local SSD with at least 20 GB of free space at all times.

• Audit third-party plugins before starting new projects and check for compatibility updates with your current Premiere Pro version.

• Keep Premiere Pro updated through the Creative Cloud Desktop app to pick up bug fixes as they are released.

Frequently Asked Questions

Why does Premiere Pro keep saying “rendering required audio files” and never finish?

The most likely cause is a corrupted media cache. Corrupted .cfa or .pek files cause the render process to loop or stall indefinitely. Clearing the media cache through Preferences > Media Cache resolves this in the majority of cases. If it does not, check your scratch disk settings and disable any third-party audio plugins as a follow-up step.

Is it safe to delete Premiere Pro’s media cache?

Yes, it is completely safe. The media cache holds conformed audio and peak files that Premiere Pro generates automatically; it does not contain your original media or project files. After deletion, Premiere Pro will rebuild the cache the next time you open the project, which typically takes a few minutes.

Does “rendering required audio files” affect the final export?

This rendering step is for timeline playback preview only and does not directly affect export quality. However, if the process hangs indefinitely, it can block the export queue from starting. Resolving the stuck render before attempting to export is the recommended approach.

Conclusion

Clearing the media cache resolves the stuck rendering bar for most editors. The remaining fixes – scratch disk reassignment, manual re-conforming, plugin disabling, and memory adjustments – address less common but equally fixable causes. Work through the steps in order and test after each one. If the issue persists after completing all seven fixes, file a support ticket through Adobe’s support portal and include your system specifications and current Premiere Pro version number