FFmpeg4Android OEM license will grant you the ability to use FFmpeg4Android library in all your applications.
There is no limit on the number of application used with this license, or the number of end users.
You can't redistribute this license to another company / developer.
For more information, please download the License.rtf below.
Since FFmpeg4Android use FFmpeg under LGPLv2.1 you should add this to an application that use FFmpeg4Android about section:
This software uses FFmpeg (http://ffmpeg.org) licensed under the LGPLv2.1 (http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html) and its source can be downloaded here: https://github.com/FFmpeg/FFmpeg