Joos is a CEP-based extension for Adobe After Effects that automates the export pipeline from the Render Queue to FFmpeg. It streamlines the creation of H.264/MP4 files by eliminating intermediary manual transcodes.
- Host: Adobe After Effects (CEP)
- Transcoder: FFmpeg
- Encoder:
libx264(H.264) / AAC - Chroma Subsampling: YUV 4:2:0
- Scaling: Lanczos Resampling (optional 2x/4x)
Joos requires PlayerDebugMode to be enabled for the Adobe CEP environment.
- Windows: Execute
debug.batas Administrator.
Move the Joos directory to the CEP extensions folder:
- Windows:
C:\Program Files (x86)\Common Files\Adobe\CEP\extensions
Note: Create the extensions directory if it is not present.
- Initialize the extension: Window > Extensions > Joos.
- Select target Composition.
- Configure CRF (Constant Rate Factor) and Scaling parameters.
- Execute EXPORT to trigger the background render and transcode process.
The following table maps the UI presets to their respective FFmpeg CRF values.
| Preset | CRF | Profile |
|---|---|---|
| Eco | 24 | Fastest |
| Bad | 21 | Very Fast |
| Poor | 18 | Fast |
| Low | 15 | Medium |
| Fair | 12 | Medium |
| Good | 9 | Slow |
| Great | 6 | Very Slow |
| Excellent | 3 | Slower |
| Lossless | 0 | Placebo |
Note: CRF values < 10 result in high-bitrate files that may exceed the decoding capabilities of standard hardware players. Use VLC or similar software for playback.