Format options and export settings
After Effects uses the Adobe Media Encoder to encode most movie formats through the Render Queue panel. You can use QuickTime to encode other movie formats (such as raw DV streams) through the File > Export menu.
For most output formats, you can specify format-specific encoding and compression options. In many cases, a dialog box opens and presents these options when you choose a format to export to, either in the Output Module Settings dialog box or from the File > Export menu.
Formats encoded by the Adobe Media Encoder share a similar export settings dialog box, which you can open by clicking the Format Options button in the Output Module Settings dialog box.
When
exporting with the Adobe Media Encoder, choosing a format automatically
makes available a list of associated presets designed for particular
delivery scenarios (for example, the Apple iPod Video Small preset
for the H.264 format). Choosing a preset activates the appropriate
options in the various settings panels (Video, Audio, and so on).
Note: It
is possible in some cases to specify a setting in an export settings
dialog box that conflicts with a setting made in the Render Settings
or Output Module Settings dialog box. In such cases, After Effects
warns you of the mismatch so that you can correct it before continuing.