School of Motion

How to Save an MP4 in After Effects

  • By Caleb Ward
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As one of the most versatile and widely-accepted video formats in the world, there are a lot of reasons as to why you might potentially need to save a video as MP4. However, if you’re reading this article chances are you might be having some trouble exporting MP4 video out of After Effects, and for good reason...


You CAN’T Export MP4 Videos in After Effects… You have to use Media Encoder.


Or at least you can’t export MP4 video in After Effects if you’re using any version of After Effects CC 2014 and beyond.


The reason is simple, MP4 is a delivery format. This means MP4 is used primarily as a video container format when you are finished with your final product and After Effects isn’t a software for delivering finished products. Instead After Effects is a software you use in the middle of the video creation process. It is expected that an artist that is using After Effects would render out their compositions into an intermediate (less-compressed) codec and finalize their video in Premiere Pro before exporting using Media Encoder to export for delivery. 

AE to ME to Mp4.jpg

Now practically speaking we don’t always have a reason to use Premiere Pro. Sometimes we just want to export an MP4 directly from After Effects to quickly show a client, or upload to the web. When this happens you might be frustrated to find no MP4 codec in sight, but don’t worry. You can still export After Effects compositions as MP4 using Media Encoder. Here’s how:

How to Export After Effects Compositions as MP4: Step by Step

Want to export an MP4? Here’s how to do it using After Effects and Adobe Media Encoder. You can also download this handy step-by-step PDF so you can reference it in the future. 


Step 1: Add to Media Encoder Queue

MP4 RAW Video in After Effects Step 1.gif

The first step is really simple, as long as you have Media Encoder installed on your computer, with your composition selected navigate to Composition > Add to Media Encoder Queue. This will automatically start Media Encoder if it is not already open on your machine. You can also use the keyboard shortcut Option+Command+M to send your composition to Media Encoder. 


Step 2: Adjust Settings

MP4 RAW Video in After Effects Step 2.gif

Once inside of Adobe Media Encoder select the dropdown menu on the far left of your screen. This will open a menu where you can select your output format. Now you might be inclined to simply hit the ‘MPEG-4’ setting, but MPEG-4 is not the same as MP4. MP4 is a video container, MPEG-4 is a codec (more on this below). Instead select ‘H264’ from the dropdown menu. This will export your video in an MP4 video container using an H264 codec (it’s confusing, I know...). 

Step 3: Render

MP4 RAW Video in After Effects Step 3.gif

Once you’ve adjusted your settings to your liking hit the ‘Export’ button. That’s all there is to it!

So.... What is MP4?

There’s a bit of misconception out there about what MP4 actually means. As a motion designer or video professional it’s essential that we understand what MP4 means. 


MP4 = Video Container


MP4 is a video container format. This means it’s a file format that houses the video, audio, closed captioning, and metadata that makes up an actual video. You can always tell what video container a given video file is by the extension at the end of the file. Popular video containers include MOV, AVI, FLV, and MP4. There’s a full list of video containers on Wikipedia. In fact, if you’re on a mac you can just go in and change the file extension from MOV to MP4 and the video file will work perfectly. It’s pretty crazy. 


Note: An MP4 file is not more compressed than an MOV file, it all has to do with the compressed video inside the container, not the container itself. MP4 just happens to support codecs that tend to be more compressed than some of the professional-level codecs supported by MOV. 

Video Container vs Codec.png

Important Ramble: MP4 is not the same as H.264…

A lot of video people get the two confused. MP4 and H264 are not the same thing...


H264 = Codec


H264 is a codec, which means it is a tool used to code and decode video files. Codecs file size is directly related to video quality. Codecs that significantly reduce the size of your video file are usually very low in quality. Codecs are housed inside of videos containers like MP4 and MOV (Quicktime). An H264 file can end with a .mp4, .mov, along with other popular video container file extensions. In short, just because a video was exported in an H264 codec doesn’t mean that the video is an MP4 video as well.


This guy explains  it better...


If you want to learn more about codecs this video from David Kong is immaculate. It’s the best guide that i’ve found for understanding codecs and how they work.

I hope you found this article to be helpful. It can be a lot to grasp, but once you know your codecs and containers you’ll feel like a video wizard. 

wizard.gif