Update README.md

README.md

@@ -21,6 +21,7 @@ Code was designed and tested on an Ubuntu 20.04 operating system using anaconda
 An environment with all the necessary libraries can be created using:
 ```bash
 conda create --name <env>
+conda activate <env>
 pip install -r requirements.txt
 ```
 Based on your ffmpeg installation you might also needs :