Quick installation of subtitleeditor

Quick installation of subtitleeditor:

Step 1: Update system:

 sudo apt-get update

Step 2: Install: subtitleeditor:

Ater updaing the OS run following command to install the packae:

 sudo apt-get install subtitleeditor

Step 3: Problem with encoders in Subtitle Editor

When I try to open a .mp4 with subtitle editor I get the following message

GStreamer-plugins missing
sudo add-apt-repository ppa:mc3man/gstffmpeg-keep  
sudo apt-get update  
sudo apt-get install gstreamer0.10-ffmpeg