The red box in Premiere Pro appears because the preview file is not generated or the material path is incorrect. Common reasons include just imported projects, material path changes, insufficient cache space, or failed proxy files loading. Solution: 1. Wait for automatic cache generation; 2. Manually generate preview rendering timeline; 3. Check and relink missing material; 4. Clean and rebuild the media cache. When using proxy clips, you should confirm that the proxy files are correctly associated and appropriately reduce the playback resolution to improve preview fluency.
The red box appears in Premiere Pro. In fact, it is not that the software is broken, but that the system tells you: some materials have not been loaded successfully for the time being. This situation is particularly common, especially when the project has just been opened or the material has not been cached.

Why does a red box appear?
Premiere Pro displays a red box, mainly because the preview file (proxy file or render file) is not generated, or there is a problem with the path of the material itself. Especially when you use high-resolution videos, such as 4K or higher, Premiere does not directly play the original material by default, but instead tries to use "Proxy" or "Rendered Preview File". If these files are missing, a red border will be displayed, indicating that the current screen cannot play smoothly.

Common situations include:
- The project has just been imported, but the preview has not been generated yet
- Move or rename the material file, causing the link to be disconnected
- There is not enough hard disk space to generate cache
- The proxy process is used but the proxy file is not loaded correctly
How to quickly solve the red frame problem?
1. Wait for automatic cache
If you just opened the project, Premiere may also generate a preview file in the background. You can pause for a few seconds to see if the red box will disappear automatically. Usually, as long as the timeline slides over and comes back, you can see the normal picture.

2. Manually generate preview
If it does not recover automatically, you can render it manually. Click "Sequence > Render In to Out" in the menu bar (provided that the in and out points have been set), or directly press Ctrl/Cmd Enter to render the entire timeline. In this way, Premiere will generate available preview files and the red box will naturally disappear.
3. Check the links of the material
If only some of the clips are red boxes, it may be that the material is missing. Right-click the red box clip → “Reveal in Project” → Check whether it is marked offline. If so, right-click "Link Media" and re-specify the source file location.
4. Clean the cache and rebuild
Sometimes an old cache error can also cause a red box. You can go to Premiere's cache settings (Preferences > Media Cache), clear out the existing media cache, and then restart the software and play the timeline again.
How to deal with red boxes when using proxy clips?
If you use the proxy workflow, the red box may be because the proxy file is not loaded successfully. Check that the proxy file has been created and associated correctly. You can right-click the main material in the project panel and select "Proxy > Set Proxy" to confirm whether the proxy file exists.
In addition, there is a "Playback Resolution" option in the lower left corner of the program monitor, which is "High" by default. If your computer is configured in a normal manner, you can temporarily adjust it to "1/4" or "1/2" to make it easier for Premiere to play the screen and avoid red boxes.
Basically these methods. Most of the time, the red box is not a big problem, mainly because the preview mechanism reminds you that it is not ready yet. As long as you ensure that the material link is fine and the cache generation is normal, you will basically not get stuck at this step.
The above is the detailed content of how to fix red frames in Premiere Pro. For more information, please follow other related articles on the PHP Chinese website!

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