Adobe After Effects is a digital visual effects, motion graphics, and compositing application developed by Adobe Systems and used in the post-production process of film making, video games and television production. Sometimes, we have to face the problem that the project fails to render in After Effects. How we can avoid failed render in After Effects? In this article, we mention 3 ways to try when the problem happens.
To check the log, you go to File => Show Errors. Then, you scroll down and notice that the latest fail will be at the bottom.
The most important thing is the approximate composition time when it failed. After that, you check the composition in After Effects and know which file failed to render. The first fix is rendering out just that file. If it fails to render, we will not use it. If it does render, then use the rendered video instead.
The next thing to do is going to Edit => Purge => All Memory and Disk Cache. After that, we check off “Click disk cache for all versions” and click OK to delete all the temporary renders and free up space. Ideally, this should be on a second.
You can set the location for the cache by going to Edit => Preferences => Media & Disk Cache. Occasionally, the cause of the issue is a corrupt cache file.
Another solution is that rendering out your composition as an image sequence. Adobe Media Encoder will render out each frame as its own file. Therefore, when it fails, you do not need to render the first section again. Each image is labelled sequentially, so you can then import this back into After Effects and overlay this layer into your composition and render out the composition again. It seems like a waste of time, but it helps us to finish the work without failure.
The last option is that you can turn off your computer, restart it, clear your cache and try again. Sometimes, After Effect can fail in the background and it is better to just reboot.
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Source: ShiveringCactus: VFX Tutorials